On Tue, Feb 21, 2017 at 8:32 AM, Baltissen, GJPAA (Ruud) <email@example.com> wrote: > Hallo Gerrit, > > >> When I did my experiments with SRAM to replace the DRAM in a C64 it was never really stable until I added the OR gate to the circuit. > > Have you documented this anywhere, including schematics? I have not tried it, but I assume it should be easy: 74LS373 (or 573) latching the 8 row address lines from original DRAM to the first 8 address lines of SRAM chip, /OE tied low, LE driven directly by /RAS. Direct connection between the 8 original DRAM address lines to the other 8 address lines of the SRAM (old column address). /CE of the SRAM = /RAS OR /CAS. R/W signal should go directly. Correct me if I'm missing something. Regards Frank Message was sent through the cbm-hackers mailing listReceived on 2017-02-21 09:00:01
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