PDP-8 /e/f/m memory
ethan.dicks at gmail.com
Mon Aug 14 23:38:47 CDT 2006
On 8/15/06, Patrick Finnegan <pat at computer-refuge.org> wrote:
> > On Aug 14, 2006, at 8:54 PM, 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.
> > >
> > > 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.
> I thought the point was to use them in a real PDP-8 e/f/m, in which case the
> extra power would probably be a non-issue..
The extra power has to do with battery life, not power-on consumption.
The amount of power that two cache SRAMs and some buffer chips takes
up is utterly invisible compared to eight set of 4K core stacks (but
you need two OMNIBUS chassis to hold that many cards; a more typical
installation is four 8K stacks or a couple of third-party 16K stacks).
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