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⌂ ∞ ▽ Elite on the 6502

Version analysis of ECBT

This code appears in the following versions (click to see it in the source code):

Code variations between these versions are shown below.

       Name: ECBT
       Type: Variable
   Category: Dashboard
    Summary: The character bitmap for the E.C.M. indicator bulb



 The character bitmap for the E.C.M. indicator's "E" bulb that gets displayed
 on the dashboard.

Code variation 1 of 2A variation in the comments only

Tap on a block to expand it, and tap it again to revert.

Cassette, Flight
6502SP, Master
Electron
 The E.C.M. indicator uses the first 5 rows of the space station's "S" bulb
 below, as the bottom 5 rows of the "E" match the top 5 rows of the "S".

 Each pixel is in mode 5 colour 2 (%10), which is yellow/white.

 The bulb is four pixels wide, so it covers two mode 2 character blocks, one
 containing the left half of the "E", and the other the right half, which are
 displayed next to each other. Each pixel is in mode 2 colour 7 (%1111), which
 is white.

 The E.C.M. indicator uses the first 5 rows of the space station's "S" bulb
 below, as the bottom 5 rows of the "E" match the top 5 rows of the "S".

 Each pixel is a white mode 4 pixel.


.ECBT

Code variation 2 of 2Related to an advanced feature

The "E" indicator bulb on the dashboard is four pixels wide in the advanced versions, while it is only three pixels wide in the cassette and disc versions. It is seven pixels wide in the Electron version, though the latter is in monochrome mode 4, so this is equivalent to 3.5 pixels in the colour versions.

Tap on a block to expand it, and tap it again to revert.

Cassette, Flight
6502SP, Master
Electron
 EQUB %11100000         \ x x x .
 EQUB %11100000         \ x x x .
 EQUB %10000000         \ x . . .
                        \ x x x .
                        \ x x x .
                        \ x . . .
                        \ x x x .
                        \ x x x .

                        \ Left half of the "E" bulb
                        \
 EQUB %11111111         \ x x
 EQUB %11111111         \ x x
 EQUB %10101010         \ x .
 EQUB %11111111         \ x x
 EQUB %11111111         \ x x
 EQUB %10101010         \ x .
 EQUB %11111111         \ x x
 EQUB %11111111         \ x x

                        \ Right half of the "E" bulb
                        \
 EQUB %11111111         \ x x
 EQUB %11111111         \ x x
 EQUB %00000000         \ . .
 EQUB %11111111         \ x x
 EQUB %11111111         \ x x
 EQUB %00000000         \ . .
 EQUB %11111111         \ x x
 EQUB %11111111         \ x x

                        \ Combined "E" bulb
                        \
                        \ x x x x
                        \ x x x x
                        \ x . . .
                        \ x x x x
                        \ x x x x
                        \ x . . .
                        \ x x x x
                        \ x x x x

 EQUB %11111110         \ x x x x x x x x .
 EQUB %11111110         \ x x x x x x x x .
 EQUB %11100000         \ x x x . . . . . .
                        \ x x x x x x x x .
                        \ x x x x x x x x .
                        \ x x x . . . . . .
                        \ x x x x x x x x .
                        \ x x x x x x x x .