Mos Technology RAM wanted

From: allisonp_at_world.std.com <(allisonp_at_world.std.com)>
Date: Tue Mar 21 11:22:35 2000

2101 was 1kbits but by 4. 256x4 22pins.

For that time it may have been 2112 or other cousins.

Allison

On Tue, 21 Mar 2000, Richard Erlacher wrote:

> I think the basic number you're looking for is "2101" from the same 1K
> series as the famous "2102" which is a 16-pin 1kx1 with separate in and out.
> The 2101's I have are not fast enough to meet the 200ns spec. However, not
> much of anything that was readily available at the time the PET model 2001
> came out was that fast. Either it was quite a bit faster, e.g. 2147, 2115,
> etc, or it was slower, e.g. 2114, 21L02, TMS4044 etc, which were typically
> 450 ns at that point in time. Those 450 ns parts worked handsomely with the
> 1 MHz 6502. Perhaps you'd be able to use a 2101.
>
> Let me know if you think that might work for you. I've had my small supply
> (maybe 4 pieces) since back in '76-'77 when I got my original 6501, though
> I've never used them for anything.
>
> Dick
> -----Original Message-----
> From: Pete Turnbull <pete_at_dunnington.u-net.com>
> To: classiccmp_at_classiccmp.org <classiccmp_at_classiccmp.org>
> Date: Tuesday, March 21, 2000 2:39 AM
> Subject: Re: Mos Technology RAM wanted
>
>
> >On Mar 20, 13:23, John Honniball wrote:
> >>
> >> On Sun, 19 Mar 2000 21:28:09 GMT Pete Turnbull
> ><pete_at_dunnington.u-net.com> wrote:
> >
> >> > One of the MCS6550 RAMs has gone west. Does anyone have a spare, or an
> >> > equivalent, for sale? It's a 22-pin 1024 x 4 200ns static RAM.
> >>
> >> I'll have to check the RAMs in the spare PET that I
> >> keep in the garage. Can't remember whether they're SRAMs
> >> or DRAMs in the bigger PETs.
> >
> >Only the oldest 2001-x PETs use those SRAMs. I guess it's time to build
> >that upgrade board (a PAL, a pair of EPROMS, and some 6264s, a 62256, or
> >some cast-off PC cache).
> >
> >--
> >
> >Pete Peter Turnbull
> > Dept. of Computer Science
> > University of York
>
Received on Tue Mar 21 2000 - 11:22:35 GMT