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I just did this mod yesterday. I removed the solder bridges under U32, added U32, added the 4 RAM chips, and changed the jumpers (JP3) next to the resistor packs. The jumpers have to be changed from their vertical bridging positions to horizontal bridges instead. I then moved JP2 from pads 1-2 to 2-3, and removed the JP7 solder bridge. 1 MB chip achieved. 2mb with one of PeteAU's trapdoor expansions.
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