Hi all,
I started disassembling DK again.
While disassembling I see that Garry is using a similar horizontal position routine that Manuel found in Battlezone! I also saw the same routine in Garry's first game Space Jockey.
LF5A4: STA WSYNC ;3
SEC ;2
LF5A7: SBC #$0F ;2
BCS LF5A7 ;2
EOR #$0F ;2
ASL ;2
ASL ;2
ASL ;2
ASL ;2
ADC #$90 ;2
STA RESP0,X ;4
STA WSYNC ;3
STA HMP0,X ;4
RTS
Now I wonder if Garry came up with this routine. He says he programmed Space Jockey by disassembling some Activision games. So far (to my knowledge) none of the disassembled Activision games use this routine.
Anyway, I thought it was interesting so I thought I'd pass it on.
Take care,
Dennis
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