IBM 5150 PC

Seth Morabito sethm at
Wed Jul 8 18:36:17 CDT 2009

On Wed, Jul 8, 2009 at 2:50 PM, Phill
Harvey-Smith<afra at> wrote:
> Actually I'm supprised no one has made an XT type card that has a single 1M
> SIMM mounted on it to expand the memory to 640K, should be pretty easy to do
> as most simms will self refresh if you reverse the order of RAS and CAS once
> in a while. I know this is at least in theory possible, as I have hooked a
> 1M simm up to a Dragon 32 (UK CoCo clone) in this way.

Now that you mention it, I'm surprised too. I'll do some research to
see if anyone else has done one. If not, it could be a fun and quick

Of course, these days it's getting hard to find 1M SIMMs, too...


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