1 Dec
2017
1 Dec
'17
8:05 p.m.
On 2017-Dec-01, at 7:12 AM, Tony Aiuto via cctalk wrote:
https://www.ebay.com/itm/263005049078
EBay listing for a "Soviet Magnetic Ferrite Core Memory Board". It looks
like 20 something gigantic cores and a lot of diodes. I am guessing it is
some kind of ROM, but it doesn't look like a rope memory. And maybe the
cores are not cores at all, but some sort of inductor. I've not seen this
before.
That's very funny.
It looks to be a core rope memory that hasn't been programmed.
Other organisations might be possible, but it looks like a pulse-transformer type of
core-rope,
where the cores are just for ordinary induction, not switching/memory cores.
- the matrix of black what-look-to-be diodes would be data-wire isolation diodes
- the little brown 'stools' are wire routing posts
- you can see the mulit-turn sense windings (bluish) already present on the cores
- above the cores are the sense amplifiers or 1st stage thereof
- there is one wire through all the cores, perhaps a test wire for core and sense amp
response
Each data-wire would start at one of the solder pins in the pin matrix on the left, weave
through the cores to encode the data,
turn back 180, then 90 degrees around one of the stools to drop down and terminate at the
solder pin by an isolation diode.
There would be another board for decoding the address to 1-of-x and 1-of-y.
I didn't count precisely but it looks like it would be 256 words of 20 bits.
That might be a date code of 6847 on a cap (or is it 6B47?), so perhaps earlier than the
listing-stated 1981.
Actually, it kind of hints at it in the description: "With out Firmware ROM wire
(empty slots)"