Compatibility of 1101A and 1101A1

dwight dkelvey at
Fri Jan 20 18:52:35 CST 2017

What clock rate are you using?


From: cctalk <cctalk-bounces at> on behalf of Brad H <vintagecomputer at>
Sent: Friday, January 20, 2017 4:24:26 PM
To: dstalk at; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Compatibility of 1101A and 1101A1

Ok.  I'm assuming they can work together then?  I have scoured the net and found a couple of pics of mark-8 boards with a mix of 1101a and 1101a1.. or maybe thats why they werent working? :)

Sent from my Samsung device

-------- Original message --------
From: dstalk at
Date: 2017-01-20  2:54 PM  (GMT-08:00)
To: cctalk at
Subject: Re: Compatibility of 1101A and 1101A1

On Fri Jan 20 15:19:24 2017 vintagecomputer at (Brad H) wrote:
> I have some C1101A RAMs I was planning to use in my Mark-8 project.  I'm
> having trouble finding more, as previously mentioned because the price has
> shot up so much.  I'm wondering, I'm finding lots of P1101A1 RAMs with the
> correct date codes.. are those compatible with C1101A/P1101A?  I don't
> understand what the 1 at the end signifies.

According to my TI manual the 1101A is 1500 ns while the A1 is
1000 ns.

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