C64-C128 CP-M Cartridge Interest

________________________________ On 12/24/10 5:40 PM, Gene Buckle wrote: They're dead easy to assemble. The only "problem" components are the unreasonably large EPROM and SRAM chips, and even they aren't too tough to find. -Dave -- Dave McGuire Port Charlotte, FL -----REPLY----- Hi! Due to numerous builder requests, we fixed the RAM/ROM size issue with SBC V2. SBC V2 accepts 28 and 32 pin ROMs (EPROM, PROM, EEPROM, or Flash) which is pretty much anything from a 27256 to a 29C040 or 27C080. You could probably go smaller if you want although I haven't tested it myself. Also the RAM accepts 512KB or 128KB SRAMs. All set with config jumpers. There are several other improvements which fixed several bugs from SBC V1. Maybe what is needed for the C64 CP/M cart is a expansion port to ECB interface board. Then plug in an N8VEM SBC, SBC-188, or whatever and use the ECB peripheral boards along with your C64. We have a 6809/6802/6502 to ECB bridge board that might be a basis. Make the C64 appear as an IO port on the ECB and as a memory mapped IO on the C64. Plug in SBC V2 for your CP/M-80 cartridge or SBC-188 V1 for the CP/M-86. Just an idea. Back in the day, I used to have a C64 with a CP/M cartridge. It was great -- Nevada FORTRAN rocks! Thanks and have a nice day! Andrew Lynch