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⌂ ∞ ▽ Elite on the BBC Micro and NES

Version analysis of CHK

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

Code variations between these versions are shown below.

       Name: CHK
       Type: Variable
   Category: Save and load
    Summary: First checksum byte for the saved commander data file
  Deep dive: Commander save files
             The competition code



 Commander checksum byte. If the default commander is changed, a new checksum
 will be calculated and inserted by the elite-checksum.py script.

 The offset of this byte within a saved commander file is also shown (it's at
 byte #75).



.CHK

Code variation 1 of 1Related to the 6502SP version

The Executive version contains a maxed-out default commander, which has a different checksum.

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

Cassette, Flight, Electron
Master
6502SP
 EQUB &03               \ The checksum value for the default commander, #75

 EQUB 0                 \ Placeholder for the checksum in byte #75

\.CHK3                  \ These instructions are commented out in the original
\EQUB 0                 \ source

 SKIP 12                \ These bytes appear to be unused, though the first byte
                        \ in this block is included in the commander file (it
                        \ has no effect, as it's the third checksum byte from
                        \ the Commodore 64 version, which isn't used in the
                        \ Master version)

IF _SNG45 OR _SOURCE_DISC

 EQUB &03               \ The checksum value for the default commander, #75

ELIF _EXECUTIVE

 EQUB &3F               \ The checksum value for the maxed-out default
                        \ commander, #75

ENDIF