How "stable" is bubble memory, over decades?
There is a Sharp PC-5000 that may be available, I believe from 1983-1985
era, which is said to have bubble memory. But the owner can't find a power
cable, to verify if anything still works.
I have older systems with ICs that are still working OK, but I was
wondering thoughts on any risk associated with bubble memory? (likelihood
of not working at all, or being damaged in long distance shipping)
Actually another thought, can any "normal" ICs be used to
replace/substitute the bubble memory?
Does anyone have a Philips P2000C CP/M luggable with the carrying strap?
I will be restoring such a machine in the near-ish future and mine is
lacking the strap. Clear photos of the end fittings that slot into the
machine, the dimensions of them, etc would be a great help in making
I recently acquired a Solid State Music SB-1 from which all the chips had
been removed. I've reinstalled all of the chips (I located an SSM2000) and
I've been trying to figure out why this board crashes my computers. The
conclusion that I've come to is rather astounding. The board specifies two
74ls85 4 bit binary comparator chips to perform address decoding. The
designers of this board seem to have had incorrect pinouts for it. Every
source that I can find specifies:
B3 1 16 VCC
A<B (in) 2 15 A3
A=B (in) 3 14 B2
A>B (in) 4 13 A2
A>B (out) 5 12 A1
A=B (out) 6 11 B1
A<B (out) 7 10 A0
GND 8 9 B0
The 7485s that I was able to get have this pinout. BUT! The SB-1 is
B2 1 16 VCC
A2 2 15 A3
A=B (out) 3 14 B3
A>B (in) 4 13 A>B (out)
A<B (in) 5 12 A<B (out)
A=B (in) 6 11 B0
A1 7 10 A0
GND 8 9 B1
I Ohm'd out the board to verify this and it matches the schematic here:
What the heck??? Did the pinout of the 7485 just arbitrarily change at some
point? Was this some competition between manufacturers? Is there any way
to get the "right" 7485?
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A bit off topic but I'm curious if anyone has any technical information on
Animatics motion controllers. Animatics was based in (Santa Clara) in
the 1990s. They were bought by Moog sometime around 2000 and all the old
info was thrown out.
A support engineer working for Moog (who had worked for Animatics before
the buyout) provided a bunch of DOS utilities and info on the RS232
programming that he found on a backup, but this is all the info that exists.
Schematics for the hardware (CPU is a Phillips SCC68070 with a MC68881 math
coprocessor), firmware code and any other technical info would be great.
Wayback machine link:
eBay link to an actual controller: https://www.ebay.com/itm/124030784795