This is rather minor, I suggest you use the declare space keyword for your
RAM variables. It makes working with RAM sooo much simpler. Plus you can
split off your constants from your RAM variable address assignments.
By doing this, you won't have to worry about manually assigning addresses
to RAM and leaving gaps between them. And if any of your variables are
2-bytes long (ds 2) you should be able to refer to them in your sourcecode
with low and high byte syntax (< and >).
If you want two variables to share the same address, you declare the space
first, then all the other variables that will have the same start address will
If you did that, it would look something like this:
processor 6502
include vcs.h
; CONSTANTS
darkblue = $82
black = $00
SEG.U vars
org $80
; RAM VARIABLES
Temp ds 1
LivesIndicator ds 1 ; remaining lives.
TimeRemaining1 ds 2 ; high order hex digit of time remaining
TimeRemaining0 ds 2 ; low order hex digit of time remaining
LevelWeAreOn1 ds 1 ; high order hex digit of current level
LevelWeAreOn0 = $85; low order hex digit of current level
LivesIndicatorBuffer ds 5 ; buffer, five bytes of lives graphic
GamePlayfieldPF0Buffer = GamePlayfieldPF0Buffer; buffer for PF0 byte of
the game playfield
TimeRemainingBuffer1 ds 5 ; buffer, five bytes high order time graphic
GamePlayfieldPF1Buffer = TimeRemainingBuffer1; buffer for PF1 byte of the
game playfield
TimeRemainingBuffer0 ds 5 ; buffer, five bytes low order time graphic
GamePlayfieldPF2Buffer = TimeRemainingBuffer0; buffer for PF2 byte of the
game playfield
LevelWeAreOnBuffer1 ds 5 ; buffer, five bytes high order lvl graphic
BufferPointer = LevelWeAreOnBuffer1
NextTableRecord = ds 1
LevelWeAreOnBuffer0 ds 5 ; buffer, five bytes low order lvl graphic
PlayfieldY ds 1
org $F000
Start
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