PDP-8 /e/f/m memory

[Ethan Dicks]

On 8/15/06, Patrick Finnegan <pat at computer-refuge.org> wrote:
> On Monday 14 August 2006 19:43, Ethan Dicks wrote:
> > Why not use a pair of 62256s?  32Kx16 and ignore 4 bits.  It'd even be
> > easy to use a Dallas DS1210 or something like it to provide battery
> > backup.
>
> I'd probably do something like what the SBC-6120 does... use some typical 486
> motherboard cache SRAM.   Cheap, and relatively easy to find. :)
>
> You'd end up with one or two chips to do 32k x 12.

32Kx8 are easy to find as old cache RAM.  They are not, however, low
power, and would not be the best solution if you wanted to hang a
battery off of them.  OTOH, unless you are using paper tape software
only, chances are you have a mass storage device and are booting into
OS/8 and don't really need battery backup.

-ethan