Map of the source code

Workspace: ZP (Loader)

Important variables used by the loader

Variable: B% (Loader)

VDU commands for setting the square mode 1 screen

Subroutine: Elite loader (Loader)

Perform a number of OS calls, check for sideways RAM, load and move the main game data, and load and run the main game code

Subroutine: PLL1 (Part 1 of 3) (Loader)

Draw Saturn on the loading screen (draw the planet)

Subroutine: PLL1 (Part 2 of 3) (Loader)

Draw Saturn on the loading screen (draw the stars)

Subroutine: PLL1 (Part 3 of 3) (Loader)

Draw Saturn on the loading screen (draw the rings)

Subroutine: DORND (Loader)

Generate random numbers

Variable: RAND (Loader)

The random number seed used for drawing Saturn

Subroutine: SQUA2 (Loader)

Calculate (A P) = A * A

Subroutine: PIX (Loader)

Draw a single pixel at a specific coordinate

Variable: TWOS (Loader)

Ready-made single-pixel character row bytes for mode 1

Variable: CNT (Loader)

A counter for use in drawing Saturn's planetary body

Variable: CNT2 (Loader)

A counter for use in drawing Saturn's background stars

Variable: CNT3 (Loader)

A counter for use in drawing Saturn's rings

Subroutine: ROOT (Loader)

Calculate ZP = SQRT(ZP(1 0))

Subroutine: OSB (Loader)

A convenience routine for calling OSBYTE with Y = 0

Variable: MESS1 (Loader)

The OS command string for loading the BDATA binary

Variable: MESS2 (Loader)

The OS command string for loading the main game code binary

Variable: MESS3 (Loader)

The OS command string for changing the disc directory to E

Workspace: ZP

Lots of important variables are stored in the zero page workspace as it is quicker and more space-efficient to access memory here

Workspace: XX3

Temporary storage space for complex calculations

Workspace: K%

Ship data blocks and ship line heaps

Workspace: WP

Ship slots, variables

Variable: TVT3

Palette data for the mode 1 part of the screen (the top part)

Variable: VEC

The original value of the IRQ1 vector

Subroutine: WSCAN

Implement the #wscn command (wait for the vertical sync)

Subroutine: DELAY

Wait for a specified time, in 1/50s of a second

Subroutine: BOOP

Make a long, low beep

Subroutine: BEEP

Make a short, high beep

Variable: SOFH

Sound chip data mask for choosing a tone channel in the range 0-2

Variable: SOOFF

Sound chip data to turn the volume down on all channels and to act as a mask for choosing a tone channel in the range 0-2

Subroutine: SOUS1

Write sound data directly to the 76489 sound chip

Subroutine: SOFLUSH

Reset the sound buffers and turn off all sound channels

Subroutine: ELASNO

Make the sound of us being hit

Subroutine: LASNO

Make the sound of our laser firing

Subroutine: NOISE

Make the sound whose number is in Y by populating the sound buffer

Subroutine: SOINT

Process the contents of the sound buffer and send it to the sound chip

Workspace: Sound variables

The sound buffer where the data to be sent to the sound chip is processed

Variable: SFXPR

Sound data block 1

Variable: SFXBT

Sound data block 2

Variable: SFXFQ

Sound data block 3

Variable: SFXVC

Sound data block 4

Subroutine: SETINTS

Set the various vectors, interrupts and timers

Variable: TVT1

Palette data for the mode 2 part of the screen (the dashboard)

Subroutine: IRQ1

The main screen-mode interrupt handler (IRQ1V points here)

Variable: VSCAN

Defines the split position in the split-screen mode

Subroutine: DOVDU19

Change the mode 1 palette

Subroutine: setzp

Copy the top part of zero page (&0090 to &00FF) into the buffer at &3000

Subroutine: NMIRELEASE

Release the NMI workspace (&00A0 to &00A7) so the MOS can use it and store the top part of zero page in the the buffer at &3000

Subroutine: getzp

Swap zero page (&0090 to &00EF) with the buffer at &3000

Subroutine: NMICLAIM

Claim the NMI workspace (&00A0 to &00A7) back from the MOS so the game can use it once again

Variable: ylookup

Lookup table for converting pixel y-coordinate to page number of screen address

Subroutine: SHIFT

Scan the keyboard to see if SHIFT is currently pressed

Subroutine: RETURN

Scan the keyboard to see if RETURN is currently pressed

Subroutine: CTRLmc

Scan the Master Compact keyboard to see if CTRL is currently pressed

Subroutine: DKS4mc

Scan the Master Compact keyboard to see if a specific key is being pressed

Subroutine: SCAN

Display the current ship on the scanner

Subroutine: LOIN

Draw a one-segment line

Variable: TWOS

Ready-made single-pixel character row bytes for mode 1

Variable: TWOS2

Ready-made double-pixel character row bytes for mode 1

Variable: CTWOS

Ready-made single-pixel character row bytes for mode 2

Subroutine: LOINQ (Part 1 of 7)

Draw a line: Calculate the line gradient in the form of deltas

Subroutine: LOINQ (Part 2 of 7)

Draw a line: Line has a shallow gradient, step right along x-axis

Subroutine: LOINQ (Part 3 of 7)

Draw a shallow line going right and up or left and down

Subroutine: LOINQ (Part 4 of 7)

Draw a shallow line going right and down or left and up

Subroutine: LOINQ (Part 5 of 7)

Draw a line: Line has a steep gradient, step up along y-axis

Subroutine: LOINQ (Part 6 of 7)

Draw a steep line going up and left or down and right

Subroutine: LOINQ (Part 7 of 7)

Draw a steep line going up and right or down and left

Subroutine: HLOIN

Draw a horizontal line from (X1, Y1) to (X2, Y1)

Variable: TWFL

Ready-made character rows for the left end of a horizontal line

Variable: TWFR

Ready-made character rows for the right end of a horizontal line

Variable: orange

Lookup table for 2-pixel mode 1 orange pixels for the sun

Subroutine: PIX1

Calculate (YY+1 SYL+Y) = (A P) + (S R) and draw stardust particle

Subroutine: PIXEL2

Draw a stardust particle relative to the screen centre

Subroutine: PIXEL

Draw a 1-pixel dot, 2-pixel dash or 4-pixel square

Variable: PXCL

A four-colour mode 1 pixel byte that represents a dot's distance

Subroutine: DOT

Draw a dash on the compass

Subroutine: CPIXK

Draw a single-height dash on the dashboard

Subroutine: ECBLB2

Start up the E.C.M. (light up the indicator, start the countdown and make the E.C.M. sound)

Subroutine: ECBLB

Light up the E.C.M. indicator bulb ("E") on the dashboard

Subroutine: SPBLB

Light up the space station indicator ("S") on the dashboard

Variable: SPBT

The bitmap definition for the space station indicator bulb

Variable: ECBT

The character bitmap for the E.C.M. indicator bulb

Subroutine: MSBAR

Draw a specific indicator in the dashboard's missile bar

Variable: HANGFLAG

The number of ships being displayed in the ship hangar

Subroutine: HANGER

Display the ship hangar

Subroutine: HAS2

Draw a hangar background line from left to right

Subroutine: HAL3

Draw a hangar background line from left to right, stopping when it bumps into existing on-screen content

Subroutine: HAS3

Draw a hangar background line from right to left

Subroutine: DVID4K

Calculate (P R) = 256 * A / Q

Subroutine: cls

Clear the top part of the screen and draw a border box

Subroutine: TT67X

Print a newline

Subroutine: CHPR

Print a character at the text cursor by poking into screen memory

Subroutine: TTX66

Clear the top part of the screen and draw a border box

Subroutine: ZES1

Zero-fill the page whose number is in X

Subroutine: ZES2

Zero-fill a specific page

Subroutine: CLYNS

Clear the bottom three text rows of the space view

Subroutine: DIALS (Part 1 of 4)

Update the dashboard: speed indicator

Subroutine: DIALS (Part 2 of 4)

Update the dashboard: pitch and roll indicators

Subroutine: DIALS (Part 3 of 4)

Update the dashboard: four energy banks

Subroutine: DIALS (Part 4 of 4)

Update the dashboard: shields, fuel, laser & cabin temp, altitude

Subroutine: PZW2

Fetch the current dashboard colours for non-striped indicators, to support flashing

Subroutine: PZW

Fetch the current dashboard colours, to support flashing

Subroutine: DILX

Update a bar-based indicator on the dashboard

Subroutine: DIL2

Update the roll or pitch indicator on the dashboard

Subroutine: ADDK

Calculate (A X) = (A P) + (S R)

Variable: FONT%

A copy of the character definition bitmap table from the MOS ROM

Variable: log

Binary logarithm table (high byte)

Variable: logL

Binary logarithm table (low byte)

Variable: alogh

Binary antilogarithm table

Workspace: UP

Configuration variables

Variable: TGINT

The keys used to toggle configuration settings when the game is paused

Subroutine: S%

Move code, set up break handler and start the game

Subroutine: DEEOR

Unscramble the main code

Subroutine: DEEORS

Decrypt a multi-page block of memory

Variable: G%

Denotes the start of the main game code, from ELITE A to ELITE H

Subroutine: DOENTRY

Dock at the space station, show the ship hangar and work out any mission progression

Variable: TRIBDIR

The low byte of the four 16-bit directions in which Trumble sprites can move

Variable: TRIBDIRH

The high byte of the four 16-bit directions in which Trumble sprites can move

Variable: SPMASK

Masks for updating sprite bits in VIC+&10 for the top bit of the 9-bit x-coordinates of the Trumble sprites

Subroutine: Main flight loop (Part 1 of 16)

Seed the random number generator

Subroutine: Main flight loop (Part 2 of 16)

Calculate the alpha and beta angles from the current pitch and roll of our ship

Subroutine: Main flight loop (Part 3 of 16)

Scan for flight keys and process the results

Subroutine: Main flight loop (Part 4 of 16)

For each nearby ship: Copy the ship's data block from K% to the zero-page workspace at INWK

Subroutine: Main flight loop (Part 5 of 16)

For each nearby ship: If an energy bomb has been set off, potentially kill this ship

Subroutine: Main flight loop (Part 6 of 16)

For each nearby ship: Move the ship in space and copy the updated INWK data block back to K%

Subroutine: Main flight loop (Part 7 of 16)

For each nearby ship: Check whether we are docking, scooping or colliding with it

Subroutine: Main flight loop (Part 8 of 16)

For each nearby ship: Process us potentially scooping this item

Subroutine: Main flight loop (Part 9 of 16)

For each nearby ship: If it is a space station, check whether we are successfully docking with it

Subroutine: Main flight loop (Part 10 of 16)

For each nearby ship: Remove if scooped, or process collisions

Subroutine: Main flight loop (Part 11 of 16)

For each nearby ship: Process missile lock and firing our laser

Subroutine: Main flight loop (Part 12 of 16)

For each nearby ship: Draw the ship, remove if killed, loop back

Subroutine: Main flight loop (Part 13 of 16)

Show energy bomb effect, charge shields and energy banks

Subroutine: Main flight loop (Part 14 of 16)

Spawn a space station if we are close enough to the planet

Subroutine: Main flight loop (Part 15 of 16)

Perform altitude checks with the planet and sun and process fuel scooping if appropriate

Subroutine: Main flight loop (Part 16 of 16)

Process laser pulsing, E.C.M. energy drain, call stardust routine

Subroutine: SPIN

Randomly spawn cargo from a destroyed ship

Subroutine: BOMBOFF

Draw the zig-zag lightning bolt for the energy bomb

Subroutine: BOMBEFF2

Erase the energy bomb zig-zag lightning bolt, make the sound of the energy bomb going off, draw a new bolt and repeat four times

Subroutine: BOMBON

Randomise and draw the energy bomb's zig-zag lightning bolt lines

Variable: BOMBPOS

A set of x-coordinates that are used as the basis for the energy bomb's zig-zag lightning bolt

Variable: BOMBTBX

This is where we store the x-coordinates for the energy bomb's zig-zag lightning bolt

Variable: BOMBTBY

This is where we store the y-coordinates for the energy bomb's zig-zag lightning bolt

Subroutine: MT27

Print the captain's name during mission briefings

Subroutine: MT28

Print the location hint during the mission 1 briefing

Subroutine: DETOK3

Print an extended recursive token from the RUTOK token table

Subroutine: DETOK

Print an extended recursive token from the TKN1 token table

Subroutine: DETOK2

Print an extended text token (1-255)

Subroutine: MT1

Switch to ALL CAPS when printing extended tokens

Subroutine: MT2

Switch to Sentence Case when printing extended tokens

Subroutine: MT8

Tab to column 6 and start a new word when printing extended tokens

Subroutine: MT9

Clear the screen and set the current view type to 1

Subroutine: MT13

Switch to lower case when printing extended tokens

Subroutine: MT6

Switch to standard tokens in Sentence Case

Subroutine: MT5

Switch to extended tokens

Subroutine: MT14

Switch to justified text when printing extended tokens

Subroutine: MT15

Switch to left-aligned text when printing extended tokens

Subroutine: MT17

Print the selected system's adjective, e.g. Lavian for Lave

Subroutine: MT18

Print a random 1-8 letter word in Sentence Case

Subroutine: MT19

Capitalise the next letter

Subroutine: VOWEL

Test whether a character is a vowel

Variable: JMTB

The extended token table for jump tokens 1-32 (DETOK)

Variable: TKN2

The extended two-letter token lookup table

Variable: QQ16

The two-letter token lookup table

Variable: NA%

The data block for the last saved commander

Variable: CHK2

Second checksum byte for the saved commander data file

Variable: CHK

First checksum byte for the saved commander data file

Variable: S1%

The drive and directory number used when saving or loading a commander file

Variable: NA2%

The data block for the default commander

Variable: shpcol

Ship colours

Variable: scacol

Ship colours on the scanner

Variable: UNIV

Table of pointers to the local universe's ship data blocks

Subroutine: FLKB

Flush the keyboard buffer

Subroutine: NLIN3

Print a title and draw a horizontal line at row 19 to box it in

Subroutine: NLIN4

Draw a horizontal line at pixel row 19 to box in a title

Subroutine: NLIN

Draw a horizontal line at pixel row 23 to box in a title

Subroutine: NLIN2

Draw a screen-wide horizontal line at the pixel row in A

Subroutine: HLOIN2

Remove a line from the sun line heap and draw it on-screen

Subroutine: BLINE

Draw a circle segment and add it to the ball line heap

Subroutine: FLIP

Reflect the stardust particles in the screen diagonal and redraw the stardust field

Subroutine: STARS

The main routine for processing the stardust

Subroutine: STARS1

Process the stardust for the front view

Subroutine: STARS6

Process the stardust for the rear view

Subroutine: MAS1

Add an orientation vector coordinate to an INWK coordinate

Subroutine: MAS2

Calculate a cap on the maximum distance to the planet or sun

Subroutine: MAS3

Calculate A = x_hi^2 + y_hi^2 + z_hi^2 in the K% block

Subroutine: STATUS

Show the Status Mode screen (red key f8)

Subroutine: plf2

Print text followed by a newline and indent of 6 characters

Subroutine: MVT3

Calculate K(3 2 1) = (x_sign x_hi x_lo) + K(3 2 1)

Subroutine: MVS5

Apply a 3.6 degree pitch or roll to an orientation vector

Variable: TENS

A constant used when printing large numbers in BPRNT

Subroutine: pr2

Print an 8-bit number, left-padded to 3 digits, and optional point

Subroutine: TT11

Print a 16-bit number, left-padded to n digits, and optional point

Subroutine: BPRNT

Print a 32-bit number, left-padded to a specific number of digits, with an optional decimal point

Variable: DTW1

A mask for applying the lower case part of Sentence Case to extended text tokens

Variable: DTW2

A flag that indicates whether we are currently printing a word

Variable: DTW3

A flag for switching between standard and extended text tokens

Variable: DTW4

Flags that govern how justified extended text tokens are printed

Variable: DTW5

The size of the justified text buffer at BUF

Variable: DTW6

A flag to denote whether printing in lower case is enabled for extended text tokens

Variable: DTW8

A mask for capitalising the next letter in an extended text token

Subroutine: FEED

Print a newline

Subroutine: MT16

Print the character in variable DTW7

Subroutine: TT26

Print a character at the text cursor, with support for verified text in extended tokens

Subroutine: BELL

Make a standard system beep

Subroutine: ESCAPE

Launch our escape pod

Subroutine: HME2

Search the galaxy for a system

Variable: HATB

Ship hangar group table

Subroutine: HALL

Draw the ships in the ship hangar, then draw the hangar

Subroutine: HAS1

Draw a ship in the ship hangar

Subroutine: TACTICS (Part 1 of 7)

Apply tactics: Process missiles, both enemy missiles and our own

Subroutine: TACTICS (Part 2 of 7)

Apply tactics: Escape pod, station, lone Thargon, safe-zone pirate

Subroutine: TACTICS (Part 3 of 7)

Apply tactics: Calculate dot product to determine ship's aim

Subroutine: TACTICS (Part 4 of 7)

Apply tactics: Check energy levels, maybe launch escape pod if low

Subroutine: TACTICS (Part 5 of 7)

Apply tactics: Consider whether to launch a missile at us

Subroutine: TACTICS (Part 6 of 7)

Apply tactics: Consider firing a laser at us, if aim is true

Subroutine: TACTICS (Part 7 of 7)

Apply tactics: Set pitch, roll, and acceleration

Subroutine: DOCKIT

Apply docking manoeuvres to the ship in INWK

Subroutine: VCSU1

Calculate vector K3(8 0) = [x y z] - coordinates of the sun or space station

Subroutine: VCSUB

Calculate vector K3(8 0) = [x y z] - coordinates in (A V)

Subroutine: TAS1

Calculate K3 = (x_sign x_hi x_lo) - V(1 0)

Subroutine: TAS4

Calculate the dot product of XX15 and one of the space station's orientation vectors

Subroutine: TAS6

Negate the vector in XX15 so it points in the opposite direction

Subroutine: DCS1

Calculate the vector from the ideal docking position to the ship

Subroutine: HITCH

Work out if the ship in INWK is in our crosshairs

Subroutine: FRS1

Launch a ship straight ahead of us, below the laser sights

Subroutine: FRMIS

Fire a missile from our ship

Subroutine: ANGRY

Make a ship hostile

Subroutine: FR1

Display the "missile jammed" message

Subroutine: SESCP

Spawn an escape pod from the current (parent) ship

Subroutine: SFS1

Spawn a child ship from the current (parent) ship

Subroutine: SFS2

Move a ship in space along one of the coordinate axes

Subroutine: LL164

Make the hyperspace sound and draw the hyperspace tunnel

Subroutine: LAUN

Make the launch sound and draw the launch tunnel

Subroutine: HFS2

Draw the launch or hyperspace tunnel

Subroutine: STARS2

Process the stardust for the left or right view

Subroutine: MU5

Set K(3 2 1 0) = (A A A A) and clear the C flag

Subroutine: MULT3

Calculate K(3 2 1 0) = (A P+1 P) * Q

Subroutine: MLS2

Calculate (S R) = XX(1 0) and (A P) = A * ALP1

Subroutine: MLS1

Calculate (A P) = ALP1 * A

Subroutine: MU6

Set P(1 0) = (A A)

Subroutine: SQUA

Clear bit 7 of A and calculate (A P) = A * A

Subroutine: SQUA2

Calculate (A P) = A * A

Subroutine: MU1

Copy X into P and A, and clear the C flag

Subroutine: MLU1

Calculate Y1 = y_hi and (A P) = |y_hi| * Q for Y-th stardust

Subroutine: MLU2

Calculate (A P) = |A| * Q

Subroutine: MULTU

Calculate (A P) = P * Q

Subroutine: MU11

Calculate (A P) = P * X

Subroutine: FMLTU2

Calculate A = K * sin(A)

Subroutine: FMLTU

Calculate A = A * Q / 256

Subroutine: MLTU2

Calculate (A P+1 P) = (A ~P) * Q

Subroutine: MUT3

An unused routine that does the same as MUT2

Subroutine: MUT2

Calculate (S R) = XX(1 0) and (A P) = Q * A

Subroutine: MUT1

Calculate R = XX and (A P) = Q * A

Subroutine: MULT1

Calculate (A P) = Q * A

Subroutine: MULT12

Calculate (S R) = Q * A

Subroutine: TAS3

Calculate the dot product of XX15 and an orientation vector

Subroutine: MAD

Calculate (A X) = Q * A + (S R)

Subroutine: ADD

Calculate (A X) = (A P) + (S R)

Subroutine: TIS1

Calculate (A ?) = (-X * A + (S R)) / 96

Subroutine: DV42

Calculate (P R) = 256 * DELTA / z_hi

Subroutine: DV41

Calculate (P R) = 256 * DELTA / A

Subroutine: DVID4

Calculate (P R) = 256 * A / Q

Subroutine: DVID3B2

Calculate K(3 2 1 0) = (A P+1 P) / (z_sign z_hi z_lo)

Subroutine: cntr

Apply damping to the pitch or roll dashboard indicator

Subroutine: BUMP2

Bump up the value of the pitch or roll dashboard indicator

Subroutine: REDU2

Reduce the value of the pitch or roll dashboard indicator

Subroutine: ARCTAN

Calculate A = arctan(P / Q)

Subroutine: LASLI

Draw the laser lines for when we fire our lasers

Subroutine: PDESC

Print the system's extended description or a mission 1 directive

Subroutine: BRIEF2

Start mission 2

Subroutine: BRP

Print an extended token and show the Status Mode screen

Subroutine: BRIEF3

Receive the briefing and plans for mission 2

Subroutine: DEBRIEF2

Finish mission 2

Subroutine: DEBRIEF

Finish mission 1

Subroutine: TBRIEF

Start mission 3

Subroutine: BRIEF

Start mission 1 and show the mission briefing

Subroutine: BRIS

Clear the screen, display "INCOMING MESSAGE" and wait for 2 seconds

Subroutine: PAUSE

Display a rotating ship, waiting until a key is pressed, then remove the ship from the screen

Subroutine: MT23

Move to row 10, switch to white text, and switch to lower case when printing extended tokens

Subroutine: MT29

Move to row 6, switch to white text, and switch to lower case when printing extended tokens

Subroutine: PAS1

Display a rotating ship at space coordinates (0, 120, 256) and scan the keyboard

Subroutine: PAUSE2

Wait until a key is pressed, ignoring any existing key press

Subroutine: GINF

Fetch the address of a ship's data block into INF

Subroutine: ping

Set the selected system to the current system

Variable: MTIN

Lookup table for random tokens in the extended token table (0-37)

Subroutine: SCALEY

Scale the y-coordinate in A

Subroutine: SCALEY2

Scale the y-coordinate in A

Subroutine: SCALEX

Scale the x-coordinate in A

Subroutine: DVLOIN

Draw a vertical line from (A, GCYT) to (A, GCYB)

Subroutine: tnpr1

Work out if we have space for one tonne of cargo

Subroutine: tnpr

Work out if we have space for a specific amount of cargo

Subroutine: DOXC

Move the text cursor to a specific column

Subroutine: DOYC

Move the text cursor to a specific row

Subroutine: INCYC

Move the text cursor to the next row

Subroutine: TRADEMODE

Clear the screen and set up a trading screen

Subroutine: TT20

Twist the selected system's seeds four times

Subroutine: TT54

Twist the selected system's seeds

Subroutine: TT146

Print the distance to the selected system in light years

Subroutine: TT60

Print a text token and a paragraph break

Subroutine: TTX69

Print a paragraph break

Subroutine: TT69

Set Sentence Case and print a newline

Subroutine: TT67

Print a newline

Subroutine: TT70

Display "MAINLY " and jump to TT72

Subroutine: spc

Print a text token followed by a space

Subroutine: TT25

Show the Data on System screen (red key f6)

Subroutine: TT24

Calculate system data from the system seeds

Subroutine: TT22

Show the Long-range Chart (red key f4)

Subroutine: TT15

Draw a set of crosshairs

Subroutine: TT14

Draw a circle with crosshairs on a chart

Subroutine: TT128

Draw a circle on a chart

Subroutine: TT219

Show the Buy Cargo screen (red key f1)

Subroutine: gnum

Get a number from the keyboard

Subroutine: NWDAV4

Print an "ITEM?" error, make a beep and rejoin the TT210 routine

Subroutine: OUTX

Print the character in Q before returning to gnum

Subroutine: TT208

Show the Sell Cargo screen (red key f2)

Subroutine: TT210

Show a list of current cargo in our hold, optionally to sell

Subroutine: TT213

Show the Inventory screen (red key f9)

Subroutine: TT214

Ask a question with a "Y/N?" prompt and return the response

Subroutine: TT16

Move the crosshairs on a chart

Subroutine: TT103

Draw a small set of crosshairs on a chart

Subroutine: TT123

Move galactic coordinates by a signed delta

Subroutine: TT105

Draw crosshairs on the Short-range Chart, with clipping

Subroutine: TT23

Show the Short-range Chart (red key f5)

Subroutine: TT81

Set the selected system's seeds to those of system 0

Subroutine: TT111

Set the current system to the nearest system to a point

Subroutine: dockEd

Print a message to say there is no hyperspacing allowed inside the station

Subroutine: hyp

Start the hyperspace process

Subroutine: wW

Start a hyperspace countdown

Subroutine: TTX110

Set the current system to the nearest system and return to hyp

Subroutine: Ghy

Perform a galactic hyperspace jump

Subroutine: jmp

Set the current system to the selected system

Subroutine: ee3

Print the hyperspace countdown in the top-left of the screen

Subroutine: pr6

Print 16-bit number, left-padded to 5 digits, no point

Subroutine: pr5

Print a 16-bit number, left-padded to 5 digits, and optional point

Subroutine: TT147

Print an error when a system is out of hyperspace range

Subroutine: prq

Print a text token followed by a question mark

Subroutine: TT151

Print the name, price and availability of a market item

Subroutine: TT152

Print the unit ("t", "kg" or "g") for a market item

Subroutine: TT162

Print a space

Subroutine: TT160

Print "t" (for tonne) and a space

Subroutine: TT161

Print "kg" (for kilograms)

Subroutine: TT16a

Print "g" (for grams)

Subroutine: TT163

Print the headers for the table of market prices

Subroutine: TT167

Show the Market Price screen (red key f7)

Subroutine: var

Calculate QQ19+3 = economy * |economic_factor|

Subroutine: hyp1

Process a jump to the system closest to (QQ9, QQ10)

Subroutine: GVL

Calculate the availability of market items

Subroutine: GTHG

Spawn a Thargoid ship and a Thargon companion

Subroutine: MJP

Process a mis-jump into witchspace

Subroutine: TT18

Try to initiate a jump into hyperspace

Subroutine: TT110

Launch from a station or show the front space view

Subroutine: TT114

Display either the Long-range or Short-range Chart

Subroutine: LCASH

Subtract an amount of cash from the cash pot

Subroutine: MCASH

Add an amount of cash to the cash pot

Subroutine: GCASH

Calculate (Y X) = P * Q * 4

Subroutine: GC2

Calculate (Y X) = (A P) * 4

Subroutine: EQSHP

Show the Equip Ship screen (red key f3)

Subroutine: dn

Print the amount of money we have left in the cash pot, then make a short, high beep and delay for 1 second

Subroutine: dn2

Make a short, high beep and delay for 0.5 seconds

Subroutine: eq

Subtract the price of equipment from the cash pot

Subroutine: prx

Return the price of a piece of equipment

Subroutine: qv

Print a menu of the four space views, for buying lasers

Subroutine: hm

Select the closest system and redraw the chart crosshairs

Subroutine: refund

Install a new laser, processing a refund if applicable

Variable: PRXS

Equipment prices

Subroutine: cpl

Print the selected system name

Subroutine: cmn

Print the commander's name

Subroutine: ypl

Print the current system name

Subroutine: tal

Print the current galaxy number

Subroutine: fwl

Print fuel and cash levels

Subroutine: csh

Print the current amount of cash

Subroutine: plf

Print a text token followed by a newline

Subroutine: TT68

Print a text token followed by a colon

Subroutine: TT73

Print a colon

Subroutine: TT27

Print a text token

Subroutine: TT42

Print a letter in lower case

Subroutine: TT41

Print a letter according to Sentence Case

Subroutine: qw

Print a recursive token in the range 128-145

Subroutine: crlf

Tab to column 21 and print a colon

Subroutine: TT45

Print a letter in lower case

Subroutine: TT46

Print a character and switch to capitals

Subroutine: TT74

Print a character

Subroutine: TT43

Print a two-letter token or recursive token 0-95

Subroutine: ex

Print a recursive token

Subroutine: SWAPPZERO

An unused routine that swaps bytes in and out of zero page

Subroutine: DOEXP

Draw an exploding ship

Variable: exlook

A table to shift X left by one place when X is 0 or 1

Variable: coltabl

Colours for ship explosions

Subroutine: SOS1

Update the missile indicators, set up the planet data block

Subroutine: SOLAR

Set up various aspects of arriving in a new system

Subroutine: NWSTARS

Initialise the stardust field

Subroutine: nWq

Create a random cloud of stardust

Subroutine: WPSHPS

Clear the scanner, reset the ball line and sun line heaps

Subroutine: FLFLLS

Reset the sun line heap

Subroutine: DET1

Show or hide the dashboard (for when we die)

Subroutine: SHD

Charge a shield and drain some energy from the energy banks

Subroutine: DENGY

Drain some energy from the energy banks

Subroutine: COMPAS

Update the compass

Subroutine: SPS2

Calculate (Y X) = A / 10

Subroutine: SPS4

Calculate the vector to the space station

Subroutine: SP1

Draw the space station on the compass

Subroutine: SP2

Draw a dot on the compass, given the planet/station vector

Subroutine: OOPS

Take some damage

Subroutine: SPS3

Copy a space coordinate from the K% block into K3

Subroutine: NWSPS

Add a new space station to our local bubble of universe

Subroutine: NWSHP

Add a new ship to our local bubble of universe

Subroutine: NwS1

Flip the sign and double an INWK byte

Subroutine: ABORT

Disarm missiles and update the dashboard indicators

Subroutine: ABORT2

Set/unset the lock target for a missile and update the dashboard

Subroutine: PROJ

Project the current ship or planet onto the screen

Subroutine: PL2

Remove the planet or sun from the screen

Subroutine: PLANET

Draw the planet or sun

Subroutine: PL9 (Part 1 of 3)

Draw the planet, with either an equator and meridian, or a crater

Subroutine: PL9 (Part 2 of 3)

Draw the planet's equator and meridian

Subroutine: PL9 (Part 3 of 3)

Draw the planet's crater

Subroutine: PLS1

Calculate (Y A) = nosev_x / z

Subroutine: PLS2

Draw a half-ellipse

Subroutine: PLS22

Draw an ellipse or half-ellipse

Subroutine: SUN (Part 1 of 4)

Draw the sun: Set up all the variables needed to draw the sun

Subroutine: SUN (Part 2 of 4)

Draw the sun: Start from the bottom of the screen and erase the old sun line by line

Subroutine: SUN (Part 3 of 4)

Draw the sun: Continue to move up the screen, drawing the new sun line by line

Subroutine: SUN (Part 4 of 4)

Draw the sun: Continue to the top of the screen, erasing the old sun line by line

Subroutine: CIRCLE

Draw a circle for the planet

Subroutine: CIRCLE2

Draw a circle (for the planet or chart)

Subroutine: WPLS2

Remove the planet from the screen

Subroutine: WP1

Reset the ball line heap

Subroutine: WPLS

Remove the sun from the screen

Subroutine: EDGES

Draw a horizontal line given a centre and a half-width

Subroutine: CHKON

Check whether any part of a circle appears on the extended screen

Subroutine: PL21

Return from a planet/sun-drawing routine with a failure flag

Subroutine: PLS3

Calculate (Y A P) = 222 * roofv_x / z

Subroutine: PLS4

Calculate CNT2 = arctan(P / A) / 4

Subroutine: PLS5

Calculate roofv_x / z and roofv_y / z

Subroutine: PLS6

Calculate (X K) = (A P+1 P) / (z_sign z_hi z_lo)

Subroutine: YESNO

Wait until either "Y" or "N" is pressed

Subroutine: TT17

Scan the keyboard for cursor key or joystick movement

Subroutine: DJOY

Scan the keyboard for cursor key or digital joystick movement

Subroutine: KS3

Set the SLSP ship line heap pointer after shuffling ship slots

Subroutine: KS1

Remove the current ship from our local bubble of universe

Subroutine: KS4

Remove the space station and replace it with the sun

Subroutine: KS2

Check the local bubble for missiles with target lock

Subroutine: KILLSHP

Remove a ship from our local bubble of universe

Subroutine: THERE

Check whether we are in the Constrictor's system in mission 1

Subroutine: NUMBOR

An unused routine that prints a number in hexadecimal

Subroutine: RESET

Reset most variables

Subroutine: RES2

Reset a number of flight variables and workspaces

Subroutine: ZINF

Reset the INWK workspace and orientation vectors

Subroutine: msblob

Display the dashboard's missile indicators in green

Subroutine: me2

Remove an in-flight message from the space view

Subroutine: Ze

Initialise the INWK workspace to a hostile ship

Subroutine: DORND

Generate random numbers

Subroutine: Main game loop (Part 1 of 6)

Spawn a trader (a Cobra Mk III, Python, Boa or Anaconda)

Subroutine: Main game loop (Part 2 of 6)

Call the main flight loop, and potentially spawn a trader, an asteroid, or a cargo canister

Subroutine: Main game loop (Part 3 of 6)

Potentially spawn a cop, particularly if we've been bad

Subroutine: Main game loop (Part 4 of 6)

Potentially spawn a lone bounty hunter, a Thargoid, or up to four pirates

Subroutine: Main game loop (Part 5 of 6)

Cool down lasers, make calls to update the dashboard

Subroutine: Main game loop (Part 6 of 6)

Process non-flight key presses (red function keys, docked keys)

Subroutine: TT102

Process function key, save key, hyperspace and chart key presses and update the hyperspace counter

Subroutine: BAD

Calculate how bad we have been

Subroutine: FAROF

Compare x_hi, y_hi and z_hi with 224

Subroutine: FAROF2

Compare x_hi, y_hi and z_hi with A

Subroutine: MAS4

Calculate a cap on the maximum distance to a ship

Variable: stackpt

Temporary storage for the stack pointer when jumping to the break handler at NEWBRK

Subroutine: NEWBRK

The standard BRKV handler for the game

Subroutine: DEATH

Display the death screen

Variable: spasto

Contains the address of the Coriolis space station's ship blueprint

Subroutine: BEGIN

Initialise the configuration variables and start the game

Subroutine: TT170

Main entry point for the Elite game code

Subroutine: DEATH2

Reset most of the game and restart from the title screen

Subroutine: BR1 (Part 1 of 2)

Show the "Load New Commander (Y/N)?" screen and start the game

Subroutine: BR1 (Part 2 of 2)

Show the "Press Fire or Space, Commander" screen and start the game

Subroutine: BAY

Go to the docking bay (i.e. show the Status Mode screen)

Subroutine: DFAULT

Reset the current commander data block to the last saved commander

Subroutine: TITLE

Display a title screen with a rotating ship and prompt

Subroutine: CHECK

Calculate the checksum for the last saved commander data block

Subroutine: CHECK2

Calculate the third checksum for the last saved commander data block (Commodore 64 and Apple II versions only)

Subroutine: JAMESON

Restore the default JAMESON commander

Subroutine: TRNME

Copy the last saved commander's name from INWK to NA%

Subroutine: TR1

Copy the last saved commander's name from NA% to INWK

Subroutine: GTNMEW

Fetch the name of a commander file to save or load

Subroutine: MT26

Fetch a line of text from the keyboard

Variable: RLINE

The OSWORD configuration block used to fetch a line of text from the keyboard

Subroutine: FILEPR

Display the currently selected media (disk or tape)

Subroutine: OTHERFILEPR

Display the non-selected media (disk or tape)

Subroutine: ZERO

Reset the local bubble of universe and ship status

Subroutine: GTDIR

Fetch the name of an ADFS directory on the Master Compact and change to that directory

Subroutine: CATS

Ask for a disc drive number and print a catalogue of that drive

Subroutine: DELT

Catalogue a disc, ask for a filename to delete, and delete the file

Subroutine: SVE

Display the disk access menu and process saving of commander files

Variable: thislong

Contains the length of the most recently entered commander name

Variable: oldlong

Contains the length of the last saved commander name

Subroutine: GTDRV

Get an ASCII disc drive number from the keyboard

Subroutine: LOD

Load a commander file

Subroutine: backtonormal

Disable the keyboard, set the SVN flag to 0, and return with A = 0

Subroutine: CLDELAY

Delay by iterating through 5 * 256 (1280) empty loops

Variable: CTLI

The OS command string for cataloguing a disc

Variable: DELI

The OS command string for deleting a file

Variable: DIRI

The OS command string for changing directory on the Master Compact

Variable: savosc

The OS command string for saving a commander file

Variable: lodosc

The OS command string for loading a commander file

Subroutine: wfile

Save the commander file

Subroutine: rfile

Load the commander file

Subroutine: SPS1

Calculate the vector to the planet and store it in XX15

Subroutine: TAS2

Normalise the three-coordinate vector in K3

Subroutine: NORM

Normalise the three-coordinate vector in XX15

Subroutine: WARP

Perform an in-system jump

Subroutine: DKS3

Toggle a configuration setting and emit a beep

Subroutine: DOKEY

Scan for the seven primary flight controls and apply the docking computer manoeuvring code

Subroutine: DK4

Scan for pause, configuration and secondary flight keys

Subroutine: TT217

Scan the keyboard until a key is pressed

Subroutine: me1

Erase an old in-flight message and display a new one

Subroutine: MESS

Display an in-flight message

Subroutine: mes9

Print a text token, possibly followed by " DESTROYED"

Subroutine: OUCH

Potentially lose cargo or equipment following damage

Subroutine: ou2

Display "E.C.M.SYSTEM DESTROYED" as an in-flight message

Subroutine: ou3

Display "FUEL SCOOPS DESTROYED" as an in-flight message

Macro: ITEM

Macro definition for the market prices table

Variable: QQ23

Market prices table

Subroutine: TIDY

Orthonormalise the orientation vectors for a ship

Subroutine: TIS2

Calculate A = A / Q

Subroutine: TIS3

Calculate -(nosev_1 * roofv_1 + nosev_2 * roofv_2) / nosev_3

Subroutine: DVIDT

Calculate (P+1 A) = (A P) / Q

Variable: KTRAN

An unused key logger buffer that's left over from the 6502 Second Processor version of Elite

Subroutine: SHPPT

Draw a distant ship as a point rather than a full wireframe

Subroutine: LL5

Calculate Q = SQRT(R Q)

Subroutine: LL28

Calculate R = 256 * A / Q

Subroutine: LL38

Calculate (S A) = (S R) + (A Q)

Subroutine: LL51

Calculate the dot product of XX15 and XX16

Subroutine: LL9 (Part 1 of 12)

Draw ship: Check if ship is exploding, check if ship is in front

Subroutine: LL9 (Part 2 of 12)

Draw ship: Check if ship is in field of view, close enough to draw

Subroutine: LL9 (Part 3 of 12)

Draw ship: Set up orientation vector, ship coordinate variables

Subroutine: LL9 (Part 4 of 12)

Draw ship: Set visibility for exploding ship (all faces visible)

Subroutine: LL9 (Part 5 of 12)

Draw ship: Calculate the visibility of each of the ship's faces

Subroutine: LL9 (Part 6 of 12)

Draw ship: Calculate the visibility of each of the ship's vertices

Subroutine: LL61

Calculate (U R) = 256 * A / Q

Subroutine: LL62

Calculate 128 - (U R)

Subroutine: LL9 (Part 7 of 12)

Draw ship: Calculate the visibility of each of the ship's vertices

Subroutine: LL9 (Part 8 of 12)

Draw ship: Calculate the screen coordinates of visible vertices

Subroutine: LL9 (Part 9 of 12)

Draw ship: Draw laser beams if the ship is firing its laser at us

Subroutine: LL9 (Part 10 of 12)

Draw ship: Calculate the visibility of each of the ship's edges and draw the visible ones using flicker-free animation

Subroutine: LL9 (Part 11 of 12)

Draw ship: Loop back for the next edge

Subroutine: LL118

Move a point along a line until it is on-screen

Subroutine: LL120

Calculate (Y X) = (S x1_lo) * XX12+2 or (S x1_lo) / XX12+2

Subroutine: LL123

Calculate (Y X) = (S R) / XX12+2 or (S R) * XX12+2

Subroutine: LL129

Calculate Q = XX12+2, A = S EOR XX12+3 and (S R) = |S R|

Subroutine: LL145 (Part 1 of 4)

Clip line: Work out which end-points are on-screen, if any

Subroutine: LL145 (Part 2 of 4)

Clip line: Work out if any part of the line is on-screen

Subroutine: LL145 (Part 3 of 4)

Clip line: Calculate the line's gradient

Subroutine: LL145 (Part 4 of 4)

Clip line: Call the routine in LL188 to do the actual clipping

Subroutine: LL9 (Part 12 of 12)

Draw ship: Draw all the visible edges from the ship line heap

Subroutine: LSPUT

Draw a ship line using flicker-free animation

Subroutine: MVEIT (Part 1 of 9)

Move current ship: Tidy the orientation vectors

Subroutine: MVEIT (Part 2 of 9)

Move current ship: Call tactics routine, remove ship from scanner

Subroutine: MVEIT (Part 3 of 9)

Move current ship: Move ship forward according to its speed

Subroutine: MVEIT (Part 4 of 9)

Move current ship: Apply acceleration to ship's speed as a one-off

Subroutine: MVEIT (Part 5 of 9)

Move current ship: Rotate ship's location by our pitch and roll

Subroutine: MVEIT (Part 6 of 9)

Move current ship: Move the ship in space according to our speed

Subroutine: MVEIT (Part 7 of 9)

Move current ship: Rotate ship's orientation vectors by pitch/roll

Subroutine: MVEIT (Part 8 of 9)

Move current ship: Rotate ship about itself by its own pitch/roll

Subroutine: MVEIT (Part 9 of 9)

Move current ship: Redraw on scanner, if it hasn't been destroyed

Subroutine: MVT1

Calculate (x_sign x_hi x_lo) = (x_sign x_hi x_lo) + (A R)

Subroutine: MVS4

Apply pitch and roll to an orientation vector

Subroutine: MVT6

Calculate (A P+2 P+1) = (x_sign x_hi x_lo) + (A P+2 P+1)

Subroutine: MV40

Rotate the planet or sun's location in space by the amount of pitch and roll of our ship

Subroutine: PLUT

Flip the coordinate axes for the four different views

Subroutine: LOOK1

Initialise the space view

Subroutine: SIGHT

Draw the laser crosshairs

Variable: sightcol

Colours for the crosshair sights on the different laser types

Variable: beamcol

An unused table of laser colours

Variable: TRIBTA

A table for converting the number of Trumbles in the hold into a number of sprites in the range 0 to 6

Variable: TRIBMA

A table for converting the number of Trumbles in the hold into a sprite-enable flag to use with VIC register &15

Subroutine: TT66

Clear the screen and set the current view type

Subroutine: TTX66K

Clear the top part of the screen and draw a border box

Variable: TRTB%

Translation table from internal key number to ASCII

Variable: IKNS

Lookup table for in-flight keyboard controls

Subroutine: FILLKL

Scan the keyboard for a flight key and update the key logger

Subroutine: CTRL

Scan the keyboard to see if CTRL is currently pressed

Subroutine: DKS5

Scan the keyboard to see if a specific key is being pressed

Subroutine: ZEKTRAN

Clear the key logger

Subroutine: RDKEY

Scan the keyboard for key presses

Subroutine: RDFIRE

Read the fire button on either the analogue or digital joystick

Subroutine: RDJOY

Read from either the analogue or digital joystick

Subroutine: TT17X

Scan the digital joystick for movement

Subroutine: yetanotherrts

Contains an RTS

Subroutine: ECMOF

Switch off the E.C.M.

Subroutine: SFRMIS

Add an enemy missile to our local bubble of universe

Subroutine: EXNO2

Process us making a kill

Subroutine: EXNO3

Make an explosion sound

Subroutine: EXNO

Make the sound of a laser strike or ship explosion

Subroutine: COLD

Set the standard BRKV handler for the game

Subroutine: NMIpissoff

Acknowledge NMI interrupts and ignore them

Variable: F%

Denotes the end of the main game code, from ELITE A to ELITE H

Variable: Dashboard image (Game data)

The binary for the dashboard image

Variable: XX21 (Game data)

Ship blueprints lookup table

Variable: E% (Game data)

Ship blueprints default NEWB flags

Variable: KWL% (Game data)

Fractional number of kills awarded for destroying each type of ship

Variable: KWH% (Game data)

Integer number of kills awarded for destroying each type of ship

Macro: VERTEX (Game data)

Macro definition for adding vertices to ship blueprints

Macro: EDGE (Game data)

Macro definition for adding edges to ship blueprints

Macro: FACE (Game data)

Macro definition for adding faces to ship blueprints

Variable: SHIP_MISSILE (Game data)

Ship blueprint for a missile

Variable: SHIP_CORIOLIS (Game data)

Ship blueprint for a Coriolis space station

Variable: SHIP_ESCAPE_POD (Game data)

Ship blueprint for an escape pod

Variable: SHIP_PLATE (Game data)

Ship blueprint for an alloy plate

Variable: SHIP_CANISTER (Game data)

Ship blueprint for a cargo canister

Variable: SHIP_BOULDER (Game data)

Ship blueprint for a boulder

Variable: SHIP_ASTEROID (Game data)

Ship blueprint for an asteroid

Variable: SHIP_SPLINTER (Game data)

Ship blueprint for a splinter

Variable: SHIP_SHUTTLE (Game data)

Ship blueprint for a Shuttle

Variable: SHIP_TRANSPORTER (Game data)

Ship blueprint for a Transporter

Variable: SHIP_COBRA_MK_3 (Game data)

Ship blueprint for a Cobra Mk III

Variable: SHIP_PYTHON (Game data)

Ship blueprint for a Python

Variable: SHIP_BOA (Game data)

Ship blueprint for a Boa

Variable: SHIP_ANACONDA (Game data)

Ship blueprint for an Anaconda

Variable: SHIP_ROCK_HERMIT (Game data)

Ship blueprint for a rock hermit (asteroid)

Variable: SHIP_VIPER (Game data)

Ship blueprint for a Viper

Variable: SHIP_SIDEWINDER (Game data)

Ship blueprint for a Sidewinder

Variable: SHIP_MAMBA (Game data)

Ship blueprint for a Mamba

Variable: SHIP_KRAIT (Game data)

Ship blueprint for a Krait

Variable: SHIP_ADDER (Game data)

Ship blueprint for an Adder

Variable: SHIP_GECKO (Game data)

Ship blueprint for a Gecko

Variable: SHIP_COBRA_MK_1 (Game data)

Ship blueprint for a Cobra Mk I

Variable: SHIP_WORM (Game data)

Ship blueprint for a Worm

Variable: SHIP_COBRA_MK_3_P (Game data)

Ship blueprint for a Cobra Mk III (pirate)

Variable: SHIP_ASP_MK_2 (Game data)

Ship blueprint for an Asp Mk II

Variable: SHIP_PYTHON_P (Game data)

Ship blueprint for a Python (pirate)

Variable: SHIP_FER_DE_LANCE (Game data)

Ship blueprint for a Fer-de-Lance

Variable: SHIP_MORAY (Game data)

Ship blueprint for a Moray

Variable: SHIP_THARGOID (Game data)

Ship blueprint for a Thargoid mothership

Variable: SHIP_THARGON (Game data)

Ship blueprint for a Thargon

Variable: SHIP_CONSTRICTOR (Game data)

Ship blueprint for a Constrictor

Variable: SHIP_COUGAR (Game data)

Ship blueprint for a Cougar

Variable: SHIP_DODO (Game data)

Ship blueprint for a Dodecahedron ("Dodo") space station

Macro: CHAR (Game data)

Macro definition for characters in the recursive token table

Macro: TWOK (Game data)

Macro definition for two-letter tokens in the token table

Macro: CONT (Game data)

Macro definition for control codes in the recursive token table

Macro: RTOK (Game data)

Macro definition for recursive tokens in the recursive token table

Variable: QQ18 (Game data)

The recursive token table for tokens 0-148

Variable: SNE (Game data)

Sine/cosine table

Variable: ACT (Game data)

Arctan table

Macro: EJMP (Game data)

Macro definition for jump tokens in the extended token table

Macro: ECHR (Game data)

Macro definition for characters in the extended token table

Macro: ETOK (Game data)

Macro definition for recursive tokens in the extended token table

Macro: ETWO (Game data)

Macro definition for two-letter tokens in the extended token table

Macro: ERND (Game data)

Macro definition for random tokens in the extended token table

Macro: TOKN (Game data)

Macro definition for standard tokens in the extended token table

Variable: TKN1 (Game data)

The first extended token table for recursive tokens 0-255 (DETOK)

Variable: RUPLA (Game data)

System numbers that have extended description overrides

Variable: RUGAL (Game data)

The criteria for systems with extended description overrides

Variable: RUTOK (Game data)

The second extended token table for recursive tokens 0-26 (DETOK3)