Re: Hardware-based vs software-based emulation

From: Francesco Messineo <>
Date: Tue, 21 Feb 2017 09:12:44 +0100
Message-ID: <>
On Tue, Feb 21, 2017 at 8:32 AM, Baltissen, GJPAA (Ruud)
<> 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
Correct me if I'm missing something.


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Received on 2017-02-21 09:00:01

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