>________________________________ > From: Jim Brain <brain@jbrain.com> >To: cbm-hackers@musoftware.de >Sent: Wednesday, October 17, 2012 11:35:03 PM >Subject: Re: ROMs replacement.. solved! > >On 10/17/2012 5:22 PM, silverdr@wfmh.org.pl wrote: >> On 2012-10-17, at 17:16, Gerrit Heitsch wrote: >> >>>> Now time to think about 27C512 with place for more KERNALS. Since I want at least three (CBM, Dolphin, Jiffy) 512 with some sort of encoder switch will have to do until Michau builds our ultimate ROM replacement board.. >>> Good to hear that the logic itself was sound, just a bit of missing copper kept it from working. >> Yes, started to work with the first shot after I added the missing connection. As I wrote I was already running out of ideas what could be the problem. I made somewhat better layout (manually routed instead of simple autorouting, no vias and no extra wires needed): >> >> http://dl.dropbox.com/u/58002657/cbm/c64/rom_adapter_pcb_1.png > >Seems like you could put the EPROM socket closer to the 24 pin header, turn the TTL logic 90 degrees, and shorten the board by half. If there is a .sch around, I could try it.c Why stop there? Replace the TTL with micro-sized versions, mount them inbetween the pin header on the bottom, and make the board the same size as the eprom! Just kidding! ;-) Steve Message was sent through the cbm-hackers mailing listReceived on 2012-10-18 13:00:09
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