On 09/16/2012 10:01 PM, Mike Naberezny wrote: > Hi Spiro, > > On 9/16/12 12:48 PM, Spiro Trikaliotis wrote: >> Note, this has already been done in the 64'er (I cannot remember the >> exact issue, though). > > It's in the file c64-2MHz.zip here: > > http://www.zimmers.net/anonftp/pub/cbm/documents/projects/accelerators/ Yes, but that is an output only setup. But since it includes the whole decoder stage, it should be easy enough modify it to hook up a 6520 or 6522 in a way that one of the ports has its DDR appear at $0000 and the data register appear at $0001, thus giving you the full 8 Bit in both directions. The rest of the logic and the other port will be lost though. Would be nice as a replacement for a 8501 as well. :) You will also need the '245 to give the 6502 the ability to tristate the address lines. Not sure if you really need the '245 for the data lines, I thought those are tristate in the 6502 already, but it can't hurt. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2012-09-17 18:00:05
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