The weird stuff I keep finding: 19 bit core memory?
cz at alembic.crystel.com
Tue Oct 20 23:02:31 CDT 2020
Ok, so the MF10 would have been hooked up to a KI10. That makes sense
then. Still interesting wonder what set of bad decisions led it to my
box of parts....
Anyone need DZ11's?
On 10/20/2020 11:39 PM, Eric Smith wrote:
> On Tue, Oct 20, 2020 at 8:06 PM Chris Zach via cctalk
> <cctalk at classiccmp.org <mailto:cctalk at classiccmp.org>> wrote:
> The real weird one is a quad board H216. I thought it was a Unibus core
> memory board,
> Most of the DEC core plane boards were not specific to any particular
> bus. though there are some exceptions.
> but it's 8k*19 bits, which means it came from one place:
> An MA10 memory box. The only one I may have been exposed to was AI (the
> original KA10).
> I'm pretty sure the H216 was too new to have been used in an MA10 or
> MB10, but I don't know which core planes or other modules were used.
> They might have still been using core modules made by external vendors
> like Ferroxcube.
> The much later MF10 does use the H216, while the MG10 uses the H217 and
> the MH10 uses the H224.
> The H216 also might have been used in memory systems for a PDP-9 (late
> in its life) or the PDP-15. The ME15 normally used the H215 18-bit core
> planes, but I think there was a parity option, which would have used the
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