Posted By
siz
on 2022-11-01
16:24:03
|  Re: New Project: Hannes-compatible 256k RAM Expansion
@SukkoPera: I think my memory test was linked somewhere on the forum before. You can find it here: http://siz.hu/external/memory_test.prg
I like these rebuild projects (to an extent). But in this specific case the 6502 plus 4 approach seems better in every aspects: size, energy consumption, etc. It's a single board carrying a 6502, an FPGA for replacing the CPU port and emulate RAM banking register beside a single 512k x 8bit SRAM. It plugs in the CPU socket and is low enough to fit into a plus/4. You have to use only one external signal from the motherboard: the CAS.
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