Hi Jim, On 18.11.2012 06:14, Jim Brain wrote: > If someone has a link or information on a design, I'd be most appreciative. I once added internal Flash ROM into the VIC-20 with my universal 6502 RAM/ROM expansion. It's pretty straight forward and you can have a look at the logic equations of the GAL it uses (www.x1541.de). But the equations for the Finaly Expansion CPLD will be more suitable for what you want to do. Some thoughts should be spent on proper timing on the Flashs /CE /OE and /WE lines, this could be a little bit tricky. Because of the extra /OE line it is different to normal SRAM. A simple method to connect two write-only banking registers in TTL to the C64 (should work on VIC-20 the same) can be seen in my NeoRAM cartridge. An implementation to write Flash on a cartridge with TTL only would be the Easyflash 1 cartridge on the C64. more on skoe.de/easyflash Nicolas Message was sent through the cbm-hackers mailing listReceived on 2012-11-18 10:00:05
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