Version analysis of TALLY - Elite on the BBC Micro and NES

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

Cassette, Disc (flight), Disc (docked), 6502 Second Processor, Master and Electron

Code variations between these versions are shown below.

.TALLY

 SKIP 2                 \ Our combat rank
                        \
                        \ The combat rank is stored as the number of kills, in a
                        \ 16-bit number TALLY(1 0) - so the high byte is in
                        \ TALLY+1 and the low byte in TALLY

Code variation 1 of 1A variation in the comments only

This variation is blank in the Cassette, Disc (flight), Disc (docked), 6502 Second Processor and Electron versions.

Master
                        \
                        \ There is also a fractional part of the kill count,
                        \ which is stored in TALLYL

                        \
                        \ If the high byte in TALLY+1 is 0 then we have between
                        \ 0 and 255 kills, so our rank is Harmless, Mostly
                        \ Harmless, Poor, Average or Above Average, according to
                        \ the value of the low byte in TALLY:
                        \
                        \   Harmless        = %00000000 to %00000011 = 0 to 3
                        \   Mostly Harmless = %00000100 to %00000111 = 4 to 7
                        \   Poor            = %00001000 to %00001111 = 8 to 15
                        \   Average         = %00010000 to %00011111 = 16 to 31
                        \   Above Average   = %00100000 to %11111111 = 32 to 255
                        \
                        \ If the high byte in TALLY+1 is non-zero then we are
                        \ Competent, Dangerous, Deadly or Elite, according to
                        \ the high byte in TALLY+1:
                        \
                        \   Competent       = 1           = 256 to 511 kills
                        \   Dangerous       = 2 to 9      = 512 to 2559 kills
                        \   Deadly          = 10 to 24    = 2560 to 6399 kills
                        \   Elite           = 25 and up   = 6400 kills and up
                        \
                        \ You can see the rating calculation in the STATUS
                        \ subroutine