Given the fact that many C64 machines have non socketed KERNAL ROMs, I continually receive requests for a KERNAL ROM cart. Academically, I see how to do it by driving ULTIMAX mode during $e000-$ffff reads, but that only works when RAM is banked out. Does anyone have an ideas on how to accomplish that? I know I could implement a mirror for $0 and $1, but folks say those addresses and the R/W signal don't show on the external bus. Implementing a complete 6510 on the cart to mirror the internal 6510 might work (discarding write operations), but that's truly a brute force approach and hardly seems worth the effort. Jim -- Jim Brain, Brain Innovations (X) brain@jbrain.com Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times! Home: http://www.jbrain.com Message was sent through the cbm-hackers mailing listReceived on 2010-11-18 23:00:13
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