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cedrik
Joined: 16 Oct 2011
Posts: 2008
Location: Rom�nia
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 Posted: Tue May 04, 2021 3:36 am Post subject: Weird memory type |
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I have this 'invoicing' machine , made in Romania in 1982. I checked the boards and i found that it's using an unusual type of memory. The ancestor of EPROM ... It is manually programmed by inserting magnetic pins in the right holes... This technology was used in some Frieden machines built in the '70s... I couldnt find any info on the internet and dont even know the name of this technology. Can anyone help me, please, with some infos? Thanks..
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mavroxur
Joined: 06 Jul 2005
Posts: 1192
Location: Wichita Falls, TX
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| Posted: Tue May 04, 2021 6:43 pm Post subject: |
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| Wouldn't this be a variant of magnetic core memory pretty much? Still pretty neat, I've never seen this before. |
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cuttingedgecs
Joined: 08 Oct 2017
Posts: 1764
Location: Australia
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| Posted: Tue May 04, 2021 7:35 pm Post subject: |
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| mavroxur wrote: | | Wouldn't this be a variant of magnetic core memory pretty much? Still pretty neat, I've never seen this before. |
I would say very different from core memory. These magnetic pegs seem to be acting as switch contacts to form a ROM, rather than storing magnetism to create RAM.
Thank you for sharing. I've never seen this before, although I have seen ROM cards where all of the contacts are bridged, and links are selectively removed or cut by machine. I saw that in a game teleprinter once as a font card, although I can't remember the name of it now. |
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cedrik
Joined: 16 Oct 2011
Posts: 2008
Location: Rom�nia
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| Posted: Wed May 05, 2021 3:04 am Post subject: |
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it's a ROM memory, seems to be 256 bytes .. but that was all i could find... here are the pages from machine's manual...
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Shigure
Joined: 05 May 2021
Posts: 1
Location: Russia
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| Posted: Wed May 05, 2021 4:59 am Post subject: |
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Yes, this is the Programable ROM. Ferrite pegs as store elements.
Similar type of electronic invoiced machine "Iskra-23"
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berni
Joined: 17 May 2011
Posts: 59
Location: Germany
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| Posted: Sat May 08, 2021 5:08 am Post subject: |
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I have also never seen one of these, quite interesting!
From schematics it seems the peg is working as a core to the transformer built into the PCB. Most probably ferrit which increases coupling when inserted...
Cheers, Bernhard |
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