Hi Dennis!
> 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.
Way cool discovery!
>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
Cool is the ADC at the end which allows easy shifting
the complete range to some extent.
> 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.
Hm... I'd be really curious to know some of the names
behind CCE. It can't be anything other but rogue
Activision or Atari programmers, can it?
> Anyway, I thought it was interesting so I thought I'd
> pass it on.
I think it's interesting to see such advanced techniques
in games with such a bad reputation. Certainly adds to
speculations that they where crippled on purpose :-)
Hm... can any of you guys do a grep over all 2600
binaries for this exact hex sequence:
e9 0f b0 fc 49 07 0a 0a 0a 0a
???
Greetings,
Manuel
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