greathierophant@gmail.com wrote:
So, I would not need six switches, but a one single pole, double throw switch. What I would do then is to bend up the A12 pin of each 4KB EPROM and solder a wire from each to the central pole of the switch. One end pole would be attached to +5v and the other end pole to ground. When the switch is in the +5v position, all six address pins will be active and the upper half of each 4KB will be active. When the switch is in the ground position, then only the lower half of each 4KB will be half.
Exactly.Of course you also need to rewire the chip select lines, since they're a bit different on EPROMs compared to the II/II+ ROMs.
-- Linards Ticmanis