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Posted Thu Nov 17, 2011 3:14 PM
Posted Thu Nov 17, 2011 3:54 PM
Posted Fri Nov 18, 2011 12:34 PM
It's the Ballblazer board which can be configured by jumpers to use ROM, EPROM or EEPROM chips and is therefore quite easy to modify into a RAM cart. Graham Percy posted the plans for this on his Geocities site which unfortunately is down now. But there is a mirror here.
Can you post a link to the circuit you are using and the part number of the PCB?
Posted Sat Nov 19, 2011 12:40 PM
Posted Sat Nov 19, 2011 3:55 PM
I had a quick look at my Ballblazer RAM board, and I noticed, that it has a capacitor bridging the middle and the right hole of C2. This seems to be missing from you board. It's been a long time, but IIRC Graham told me to add it, because I had problems getting my POKEY RAM cart to work at first too. Maybe that's you problem as well.
Image of my attempt:
Posted Sun Nov 20, 2011 10:17 AM
Posted Sun Nov 20, 2011 10:47 AM
Posted Sun Nov 20, 2011 11:04 PM
The capacitor is the same as the other two near the RAM and the POKEY. It's a "104" or 0.1 uF.
Posted Mon Nov 21, 2011 6:54 AM
Posted Tue Nov 22, 2011 10:34 AM
Posted Sat Dec 3, 2011 12:45 AM
Posted Sat Dec 3, 2011 2:49 AM
Posted Fri Jan 13, 2012 9:54 AM
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