Re: Hardware-based vs software-based emulation

From: Francesco Messineo <francesco.messineo_at_gmail.com>
Date: Tue, 21 Feb 2017 09:12:44 +0100
Message-ID: <CAESs-_xsbR7zhwGur7miZaoUthYhBRsoLboFbJn89O56vwdAMw@mail.gmail.com>
On Tue, Feb 21, 2017 at 8:32 AM, Baltissen, GJPAA (Ruud)
<ruud.baltissen@apg.nl> 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 list
Received on 2017-02-21 09:00:01

Archive generated by hypermail 2.2.0.