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Posted By

Twinspirit32
on 2017-01-07
10:38:30
 Re: Porting to Commodore Plus 4 of my game Genius, memory/bitmap mode questions..

About mapping hires bitmap area to Pg1 $8000-$9FFF and Pg2 $C000-$DFFF:

3 emulators, 3 different behavours:

Testing on VICE :
Both areas /pages works fine without enabling RAM with $FF3F, it shows graphics RAM data correctly and game works fine. No need to enable RAM.

Testing on YAPE:
Hires Page1 mapped at $8000-$9FFF works fine without enabling RAM with $FF3F, shows RAM data
Hires Page2 mapped at $C000-$DFFF needs enabling RAM with $FF3F, shows ROM data

Testing on PLUS4EMU:
Hires Page1 mapped at $8000-$9FFF needs enabling RAM with $FF3F, shows ROM data
Hires Page2 mapped at $C000-$DFFFneeds enabling RAM with $FF3F, shows ROM data

Anyone have experience on real hardwere and knows what's the real behaviour of this Bitmap/TED addressing accessing?

happy



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