Posted By
siz
on 2023-03-19
10:44:24
|  Re: New Project: Hannes-compatible 256k RAM Expansion
As far as I recall (I don't remember where from): actually Csory expansion is activated when bit 4 and 5 are _different_ . It doesn't matter which one is 1 and which one is 0 as long as they are different. I'm not sure it was one of the PCX files in Solder's schematics ZIP or in the handwritten notes I got from Csory.
edit: just checked: you can see on 05.PCX that Csory expansion is activated by bit 4 and 5 connected to an XOR gate. So yes, the difference is that matters.
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