On Thu, Oct 26, 2017, at 09:58 PM, Jesus Cea wrote: > According to that if 6510 $0/$1 is CHAREN=HIRAM=LORAM=0, you have a flat > 64 Kbytes internal RAM if GAME=1 (default if not cartridge) but you will > have I/O at $D000-$DFFF if GAME=0 (and EXROM=1, default if floating). > > In this mode there are external ROMs mapped in and I don't know if the > VIC-II can see them, Yes, in Ultimax mode the external ROMs are visible to the VIC-II. > but if GAME is only zero when accessing $D000-$DFFF > in a CPU access cycle, we get just what we want. > > Is this the holy grail I was looking for?. Back when I had a SuperCPU I didn't have a logic analyzer. Now I have a logic analyzer, but I sold my SuperCPU. So I have no way of confirming it, but afaict that's the way you have to do it - flip /GAME for half a cycle when writing to $Dxxx. -- Per Olofsson magervalp@fastmail.fm Message was sent through the cbm-hackers mailing listReceived on 2017-10-27 10:00:02
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