So, who makes 256-byte RAM devices at TTL speeds these days. There are all
sorts of FIFOs of 256 bytes, but I can't find a simple 256-byte RAM any
more. I also need a 32x8-bit sram, fast (preferably address-access time
<<10ns) and preferably in a small package.
Dick
-----Original Message-----
From: Tony Duell <ard_at_p850ug1.demon.co.uk>
To: Discussion re-collecting of classic computers
<classiccmp_at_u.washington.edu>
Date: Wednesday, October 20, 1999 5:47 PM
Subject: Re: OT: how big would it be?
>>
>> > > Signetics 82mumble WOM (write only memory) april first version.
>> >
>> > Oh, she's good. She's very good.
>>
>> And old...
>>
>> Memory says 82s129, I have the data sheet home in that 1971 signetics
>> data book. I was my first ttl databook!
>
>The 82S129 was a fusible-link PROM. It was an actual device, and in
>production until quite recently.
>
>I have here the Signetics data sheet for the 25120 'Fully Encoded 9046*N
>Random Access Write Only Memory'. I suspect that's the one you're
>thinking of. It includes graphs of 'Bit Capacity .vs. temperature', 'Iff
>.vs. Vff', 'Number of pins remaining .vs. Number of socket insertions'
>and 'AQL .vs. Selling Price'... :-)
>
>Incidentally the nominal Vff is given as 6.3V. I wonder how many
>modern-day engineers would realise the significance.
>
>If anyone wants to get this data sheet, it's reprinted on page 605 of the
>'Student Manual for the Art of Electronics' by Thomas C Hayes and Paul
>Horowitz (2nd Edition, ISBN 0-521-37709-9)
>
>-tony
>
Received on Wed Oct 20 1999 - 18:58:04 BST