Hi, I've been doing some B128 (610) programming lately and I ran out of space in the tiny 1K RAM area in bank 15. To get more RAM in bank 15, I modified a Handic ROM cartridge. This ended up being very simple to do and requires adding only one 74LS00. If you have a CBM-II cartridge, it's likely to be this same board. The cartridge normally holds two 2764 EPROMs. I replaced these with two 6264 SRAMs (total 16K). I also piggybacked another 6264 to max it out at 24K. I have photos and the schematic here: http://mikenaberezny.com/projects/cbm2-24k It's equivalent to Gary Anderson's 24K cartridge (see "Hardware Add-ons"): http://www.6502.org/users/sjgray/computer/cbm2/index.html Regards, Mike -- Mike Naberezny (email@example.com) http://6502.org Message was sent through the cbm-hackers mailing listReceived on 2012-12-03 02:00:05
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