Hi Maciej, >There are now two more C128s expanded to 256K of RAM using MMU >expansion: http://www.zimmers.net/anonftp/pub/cbm/documents/projects/memory/c128/1028/index.html Great! Are spare 8722 MMU chips still reasonably easily available? I am not too familiar with FPGAs, but I would expect that it should be possible to create a FPGA based 8722 that would directly generate the 4 CAS signals. Maybe it could even be done in the DIP48 footprint, by using a suitable SMD case, say, TSOP56. Such a daughter board would also serve as a spare part. A step further might be to accommodate all RAM and ROM (except the color RAM and the VDC RAM) in a daughter board, as SRAM and Flash ROM. It could require replacing the PLA as well. I do not know how feasible it would be, and if it would be doable in a way that would be compatible with both the original 128/128D and the 128DCR. By the way, the file gal-jed/C128_MMU256K.pdf is not in Portable Document Format. Best regards, MarkoReceived on 2022-07-18 19:00:07
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