OT: how big would it be?

From: Don Maslin <donm_at_cts.com>
Date: Wed Oct 20 22:40:21 1999

On Wed, 20 Oct 1999, Tony Duell wrote:

> >
> > > > 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.

Probably only those who had been exposed to transformer powered radios
and TVs. Suggests filament voltage to me.

                                                 - don
 
> 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 - 22:40:21 BST