Re: ROMs replacement.. solved!

From: Jim Brain <>
Date: Wed, 17 Oct 2012 22:35:03 -0500
Message-ID: <>
On 10/17/2012 5:22 PM, 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):

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.


       Message was sent through the cbm-hackers mailing list
Received on 2012-10-18 04:00:05

Archive generated by hypermail 2.2.0.