--- Chandra Bajpai <cbajpai_at_attbi.com> wrote:
> I'd be interested .... Did the 8032 PETs use them?
No. The 8032 used a set of 4 2114s for video RAM, IIRC, but no 1/4K SRAMs.
> -----Original Message-----
> From: owner-classiccmp_at_classiccmp.org
> [mailto:owner-classiccmp_at_classiccmp.org] On Behalf Of Arlen Michaels
> Sent: Thursday, May 02, 2002 9:19 PM
> To: classiccmp
> Subject: Anyone need 2112 RAMs?
>
> I was surprised to find a local supplier clearing old stock of 2112
> RAMs. This is an NMOS static RAM 256bit x 4. The chips are new,
> labelled SY2112-A (Synertek I think) and they're supposedly 350 nS
> devices.
Hmm... didn't know about these.
> I believe this was the chip used in late-model Commodore PETs (after
> they designed out the earlier 6550 chips); maybe someone wants to
> confirm this for the list.
Not sure. I think there was a redesign of the static PET, but I thought
it used 2114s (same geometry as the 6550s). There might be schematics
on funet.
Found this reference, though...
http://www.obsoletecomputermuseum.org/pet/petguts.html
... where it mentions the redesign. It does describe them as 512x4.
I always thought they were 4096 bit not 2048 bit parts. Counting
chips in a photo of the motherboard gives you 16 chips x 1024x4 = 8KB.
-ethan
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Received on Fri May 03 2002 - 14:00:52 BST