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⌂ ∞ ▽ Elite on the 6502

Version analysis of SHIP_KRAIT

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

Code variations between these versions are shown below.

       Name: SHIP_KRAIT
       Type: Variable
   Category: Drawing ships
    Summary: Ship blueprint for a Krait
  Deep dive: Ship blueprints
             Comparing ship specifications



.SHIP_KRAIT

 EQUB 1                 \ Max. canisters on demise = 1
 EQUW 60 * 60           \ Targetable area          = 60 * 60

 EQUB LO(SHIP_KRAIT_EDGES - SHIP_KRAIT)            \ Edges data offset (low)
 EQUB LO(SHIP_KRAIT_FACES - SHIP_KRAIT)            \ Faces data offset (low)

Code variation 1 of 6Related to an advanced feature

The advanced versions of Elite have an extra edge count for the ship colour; Kraits are shown in cyan.

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

Flight, Docked
6502SP, Master
 EQUB 85                \ Max. edge count          = (85 - 1) / 4 = 21

 EQUB 89                \ Max. edge count          = (89 - 1) / 4 = 22

 EQUB 0                 \ Gun vertex               = 0
 EQUB 18                \ Explosion count          = 3, as (4 * n) + 6 = 18
 EQUB 102               \ Number of vertices       = 102 / 6 = 17
 EQUB 21                \ Number of edges          = 21
 EQUW 100               \ Bounty                   = 100
 EQUB 24                \ Number of faces          = 24 / 4 = 6

Code variation 2 of 6Related to the BBC Micro disc version

In the disc version, the Krait has a visibility distance of 25 compared to 20 in the other versions, so if one is running away from you in the disc version, it will turn into a dot later than in the other versions.

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

Docked, 6502SP, Master
Flight
 EQUB 20                \ Visibility distance      = 20

 EQUB 25                \ Visibility distance      = 25

 EQUB 80                \ Max. energy              = 80
 EQUB 30                \ Max. speed               = 30

 EQUB HI(SHIP_KRAIT_EDGES - SHIP_KRAIT)            \ Edges data offset (high)
 EQUB HI(SHIP_KRAIT_FACES - SHIP_KRAIT)            \ Faces data offset (high)

Code variation 3 of 6Related to the BBC Micro disc version

The ship hangar in the disc version displays the Krait with normals scaled with a factor of 4, which are more accurate than in the ship hangars of the other enhanced versions, which store them with a scale factor of 2.

See below for more variations related to this code.

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

Docked
Flight, 6502SP, Master
 EQUB 2                 \ Normals are scaled by    = 2^2 = 4

 EQUB 1                 \ Normals are scaled by    = 2^1 = 2

 EQUB %00010000         \ Laser power              = 2
                        \ Missiles                 = 0

.SHIP_KRAIT_VERTICES

      \    x,    y,    z, face1, face2, face3, face4, visibility
 VERTEX    0,    0,   96,     1,      0,    3,     2,         31    \ Vertex 0
 VERTEX    0,   18,  -48,     3,      0,    5,     4,         31    \ Vertex 1
 VERTEX    0,  -18,  -48,     2,      1,    5,     4,         31    \ Vertex 2
 VERTEX   90,    0,   -3,     1,      0,    4,     4,         31    \ Vertex 3
 VERTEX  -90,    0,   -3,     3,      2,    5,     5,         31    \ Vertex 4

Code variation 4 of 6Specific to an individual platform

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Docked
Flight, 6502SP, Master
 VERTEX   90,    0,   87,     1,     0,     1,     1,         28     \ Vertex 5
 VERTEX  -90,    0,   87,     3,     2,     3,     3,         28     \ Vertex 6

 VERTEX   90,    0,   87,     1,      0,    1,     1,         30    \ Vertex 5
 VERTEX  -90,    0,   87,     3,      2,    3,     3,         30    \ Vertex 6

 VERTEX    0,    5,   53,     0,      0,    3,     3,          9    \ Vertex 7
 VERTEX    0,    7,   38,     0,      0,    3,     3,          6    \ Vertex 8
 VERTEX  -18,    7,   19,     3,      3,    3,     3,          9    \ Vertex 9
 VERTEX   18,    7,   19,     0,      0,    0,     0,          9    \ Vertex 10
 VERTEX   18,   11,  -39,     4,      4,    4,     4,          8    \ Vertex 11
 VERTEX   18,  -11,  -39,     4,      4,    4,     4,          8    \ Vertex 12
 VERTEX   36,    0,  -30,     4,      4,    4,     4,          8    \ Vertex 13
 VERTEX  -18,   11,  -39,     5,      5,    5,     5,          8    \ Vertex 14
 VERTEX  -18,  -11,  -39,     5,      5,    5,     5,          8    \ Vertex 15
 VERTEX  -36,    0,  -30,     5,      5,    5,     5,          8    \ Vertex 16

.SHIP_KRAIT_EDGES

    \ vertex1, vertex2, face1, face2, visibility
 EDGE       0,       1,     3,     0,         31    \ Edge 0
 EDGE       0,       2,     2,     1,         31    \ Edge 1
 EDGE       0,       3,     1,     0,         31    \ Edge 2
 EDGE       0,       4,     3,     2,         31    \ Edge 3
 EDGE       1,       4,     5,     3,         31    \ Edge 4
 EDGE       4,       2,     5,     2,         31    \ Edge 5
 EDGE       2,       3,     4,     1,         31    \ Edge 6
 EDGE       3,       1,     4,     0,         31    \ Edge 7

Code variation 5 of 6Specific to an individual platform

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

Docked
Flight, 6502SP, Master
 EDGE       3,       5,     1,     0,         28    \ Edge 8
 EDGE       4,       6,     3,     2,         28    \ Edge 9
 EDGE       1,       2,     5,     4,          5    \ Edge 10

 EDGE       3,       5,     1,     0,         30    \ Edge 8
 EDGE       4,       6,     3,     2,         30    \ Edge 9
 EDGE       1,       2,     5,     4,          8    \ Edge 10

 EDGE       7,      10,     0,     0,          9    \ Edge 11
 EDGE       8,      10,     0,     0,          6    \ Edge 12
 EDGE       7,       9,     3,     3,          9    \ Edge 13
 EDGE       8,       9,     3,     3,          6    \ Edge 14
 EDGE      11,      13,     4,     4,          8    \ Edge 15
 EDGE      13,      12,     4,     4,          8    \ Edge 16
 EDGE      12,      11,     4,     4,          7    \ Edge 17
 EDGE      14,      15,     5,     5,          7    \ Edge 18
 EDGE      15,      16,     5,     5,          8    \ Edge 19
 EDGE      16,      14,     5,     5,          8    \ Edge 20

.SHIP_KRAIT_FACES

Code variation 6 of 6Related to the BBC Micro disc version

See variation 3 above for details.

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Docked
Flight, 6502SP, Master
    \ normal_x, normal_y, normal_z, visibility
 FACE        7,       48,        6,         31      \ Face 0
 FACE        7,      -48,        6,         31      \ Face 1
 FACE       -7,      -48,        6,         31      \ Face 2
 FACE       -7,       48,        6,         31      \ Face 3
 FACE       77,        0,     -154,         31      \ Face 4
 FACE      -77,        0,     -154,         31      \ Face 5

    \ normal_x, normal_y, normal_z, visibility
 FACE        3,       24,        3,         31      \ Face 0
 FACE        3,      -24,        3,         31      \ Face 1
 FACE       -3,      -24,        3,         31      \ Face 2
 FACE       -3,       24,        3,         31      \ Face 3
 FACE       38,        0,      -77,         31      \ Face 4
 FACE      -38,        0,      -77,         31      \ Face 5