On 12/9/2016 6:22 AM, smf wrote: > On 09/12/2016 07:16, Jim Brain wrote: >> Designing a soft-banking solution requires at least 2 ICs (a latch to >> hold the bank and something to combine IO1, R/W, and Phi2), should be >> 3 (the C128 really needs the dual FF clock fixer circuit that Skoe >> and Martin Hoffmann-Vetter designed), and that started to sound like >> work... > > Could you do bank switching with a single registered pal/gal? Yes, but that requires a programmer, etc., and that increases the complexity quite a bit. > I can't find anything about the dual FF clock fixer. It's on the EasyFlash Essentially, it delays the clock start by 1/2 dotclock period and shortens it. From Martin's response to me: DotCLK _| |_| |_| |_| |_| |_| |_| |_| |_ _______________ Phi2 =OE_______| |_________ _______ Phi2' _________| |_______________ _______ Phi2"=WE_____________| |___________ Possibly Martin will respond on list with more detail. Since he responded to me personally, I'd prefer he post to the list. > > Would your design also allow you to make a c128 native cartridge? > > http://blog.worldofjani.com/?p=1600 > > The difference seems to be 16k instead of 8k for ROML/ROMH and no > game/exrom jumper. It would require a jumper wire from A13 on the ROMs to A13 on the cart connector, and if Mark wants, I can quickly add that :-) Message was sent through the cbm-hackers mailing listReceived on 2016-12-09 19:00:02
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