14 Aug
2006
14 Aug
'06
5:59 p.m.
On Aug 14, 2006, at 8:54 PM, Ethan Dicks wrote:
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.
True, but I think the idea there was to duplicate the functionality
of core, i.e. the nonvolatility in this case.
That said, though, I've not found 486 motherboard cache memory to be
particularly easy to find. I did, however, buy a box of about 80 6264
chips on eBay a few months ago for fifteen bucks. And 62256s are still
manufactured, as far as I'm aware.
-Dave
--
Dave McGuire
Cape Coral, FL
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.