8 Dec
2005
8 Dec
'05
12:15 p.m.
Just catching up with these posts :>)
My old Quarndon cat. gives it as a Write while Read RAM with o/c O/Ps. 32x2.
It has a logic level schematic ( quite small ) if that's any use- I can get
it scanned and enlarged.
Geoff.
----- Original Message -----
From: "Brad Parker" <brad at heeltoe.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Wednesday, September 07, 2005 10:53 PM
Subject: Re: datasheets for 82S21 - Signetics 32x2 SRAM?
Tony Duell wrote:
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Here's the pinout. I have no idea what some of the signals are for (does
it, for example, have separate write-enable inputs for the 2 bits?), but
it may be better than nothing.
Thanks - I know the pinout. I think this ram would allow some sort of
simultaneous read/write (not dual port, just overlapped) but I don't
know how it works.
The NatSemi DM86S21 might be an equivalent, I can
find no
cross-references to it in other memory databooks, though.
Huh. I could not find anything on the 86S21, but I don't have national
books. Anyone else?
-brad
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