Post ARHXiJHlsFPbXUjXMG by bartholin@lainchan.gay
(DIR) More posts by bartholin@lainchan.gay
(DIR) Post #ARGpHeh3mAo08I2eoq by victorgijsbers@mastodon.gamedev.place
2023-01-03T15:07:47Z
2 likes, 8 repeats
Looking for people who know something about early computing, especially in the Netherlands. Please boost and help me solve the mystery of this custom made plate that used to belong to my grandfather Bram Jan Loopstra, one of the pioneers of Dutch computing. What do the pictures mean? #computing #history
(DIR) Post #ARGpHf4oLrnvJx9cq8 by mansr@society.oftrolls.com
2023-01-03T15:39:28Z
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@victorgijsbers Looks like a representation of a magnetic core memory at the top, a diagram symbol centre left, and a magnetic hysteresis curve centre right. Don't know what the dot patterns might be.
(DIR) Post #ARGpHgK5iXcZBdJLIO by victorgijsbers@mastodon.gamedev.place
2023-01-03T15:09:37Z
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The binary is obviously a date, 8-3-1956. That's the year that my grandfather and his collaborators finished the ARMAC computer. So my first hypothesis is that it's a commemorative plate for that. If so, the pictures may have something to do with this computer.
(DIR) Post #ARGpHi25MSPGUMtzVY by victorgijsbers@mastodon.gamedev.place
2023-01-03T15:11:01Z
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The words at the bottom are the motto of early modern Dutch scientist Simon Stevin. It means something like: "It's a miracle, but not a miracle", indicating the power of science to explain the seemingly miraculous.
(DIR) Post #ARGpMAi8g62WaihTNI by mansr@society.oftrolls.com
2023-01-03T15:40:19Z
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@victorgijsbers Looks like a representation of a magnetic core memory at the top, a diagram symbol centre left, and a magnetic hysteresis curve centre right. The dot patterns probably represent the stored data.
(DIR) Post #ARGpOBb2MBdDutL49w by penguin42@mastodon.org.uk
2023-01-03T15:40:39Z
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@victorgijsbers The diagram on the left to me looks like a valve; possibly a pentode: https://commons.wikimedia.org/wiki/File:Pentode_symbol_labeled.svgThe thing at the top I'm guessing is a core memory?The thing to the right looks to me like a diagram of hysteresis ( https://en.wikipedia.org/wiki/Hysteresis ) - which hmm I'd guess would be related to the magnetic cores??? But hmm the lines with the black blobs; it could be a baudot representation https://en.wikipedia.org/wiki/Baudot_code
(DIR) Post #ARGpQXUhubJqPXV4Yy by mansr@society.oftrolls.com
2023-01-03T15:41:07Z
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@victorgijsbers Looks like a representation of a magnetic core memory at the top, a diagram symbol for a vacuum tube centre left, and a magnetic hysteresis curve centre right. The dot patterns probably represent the stored data.
(DIR) Post #ARGpfGznXFg3aM4IHQ by chemoelectric@masto.ai
2023-01-03T15:43:42Z
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@penguin42 @victorgijsbers Oh, yes, that’s certainly a pentode. (The surrounding circle would just mean it was in a tube by itself.) And that’s definitely hysteresis, which is symbolic of (any kind of) memory.
(DIR) Post #ARGqLaStXUUc8Ar4IS by purple@nya.social
2023-01-03T15:51:25.178Z
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@victorgijsbers@mastodon.gamedev.place there's a lot going on here. at the top is formatted like a date, 8-3-1956 when naively decoded.on the left is a symbol for a type of vacuum tube, the grid and plate are clearly visible but i'm not sure what kind of tube it's trying to depict (there were MANY and they all predate me). on the right is the output of an oscilloscope that is i think showing the correct test pattern for a carrier wave.the middle column is a depiction of core rope memory along with two 5-byte words that are to be loaded into it. i'd have to know more about the architectures he worked on to be able to decode this correctly.i only speak bad english so i'm not sure what the bottom says :)http://drhart.ucoz.com/index/core_memory/0-123 < info about rope memory, for the uninitiated among us.
(DIR) Post #ARGryySCNoy1mKsGvY by chemoelectric@masto.ai
2023-01-03T15:46:25Z
0 likes, 0 repeats
@penguin42 @victorgijsbers (I’m a little curious why a pentode instead of a triode, but I have very little knowledge of tubes/valves and certainly not of their use in digital circuitry.)
(DIR) Post #ARGryyxOVpv9L5TBYG by penguin42@mastodon.org.uk
2023-01-03T16:09:42Z
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@chemoelectric @victorgijsbers Yeh same here; I wonder if you end up with something like a 3 input AND gate?
(DIR) Post #ARGwR9h8aC6UZCYTyq by chemoelectric@masto.ai
2023-01-03T16:59:36Z
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@penguin42 @victorgijsbers Could be. Let’s see ... ‘Tube computers primarily used triodes and pentodes as switching and amplifying elements. At least one specially designed gating tube had two control grids with similar characteristics, which allowed it to directly implement a two-input AND gate.’https://en.wikipedia.org/wiki/Vacuum-tube_computer
(DIR) Post #ARH7114V7V2FmzDoKu by alltherum@freeradical.zone
2023-01-03T18:58:09Z
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@penguin42 @victorgijsbers If he used the original ITA1 encoding, it says "G22 44.4"
(DIR) Post #ARH8iGosXqAr2M6U1Q by freemo@qoto.org
2023-01-03T19:17:08Z
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@victorgijsbers If it is helped "Wonder en is gheen wonder" is the name of a dutch magazine for skeptics..
(DIR) Post #ARH8p9KUn6aPpmAkRk by victorgijsbers@mastodon.gamedev.place
2023-01-03T19:18:26Z
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@freemo Well, they took that title from Simon Stevin, a famous Dutch scientist from the Scientific Revolution, whose motto this was. I suspect the plate is quoting Stevin, not a magazine for sceptics. ;-)
(DIR) Post #ARH8tnxnen9P14mCh6 by freemo@qoto.org
2023-01-03T19:19:15Z
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@victorgijsbers That is probably the case. Have you deciphered the rest? I've got a good idea what it all means but looks like you probably got the answer somewhere already.
(DIR) Post #ARHJyep2AeOtbnC0oK by gordonguthrie@mastodon.scot
2023-01-03T21:23:23Z
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@penguin42 @victorgijsbers yeah that core memory deffo
(DIR) Post #ARHOfcPxNzOSQ6CiIq by lopta@mastodon.social
2023-01-03T22:15:58Z
0 likes, 0 repeats
@penguin42 @victorgijsbers That's a data flow diagram symbol representing printed output, I think.
(DIR) Post #ARHRD0HVsifjtfIktM by mmu_man@m.g3l.org
2023-01-03T22:44:27Z
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@victorgijsbers the symbol on the left seems to be some vacuum tube, with filament, anode, cathode and several grilles.On the right, it represents an hysteresis trace, like that of Schmitt Trigger logic gates.At the top I believe it could be some core memory…
(DIR) Post #ARHSaGiv15RVVOmHUO by bartholin@lainchan.gay
2023-01-03T22:59:48.059608Z
1 likes, 0 repeats
@victorgijsbers The date is eight march 1956Drawing on top looks like core memoryhttps://en.wikipedia.org/wiki/Magnetic-core_memoryOn the right it is a hysteresishttps://en.wikipedia.org/wiki/HysteresisCenter and bottom figures seem to be some Baudot codes, but I cannot find any meaning to it.https://en.wikipedia.org/wiki/Baudot_codeWonder en is gheen wonder means "Mystery is no mystery"I don't know about left figure
(DIR) Post #ARHUYKHH206PrE346K by bartholin@lainchan.gay
2023-01-03T23:21:52.639527Z
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@victorgijsbers Picture on the left is a vacuum tube, probably a pentodehttps://en.wikipedia.org/wiki/Pentode
(DIR) Post #ARHXiJHlsFPbXUjXMG by bartholin@lainchan.gay
2023-01-03T23:57:16.643535Z
1 likes, 1 repeats
@victorgijsbers For the Baudot code, all my attempt at deciphering it leads to rubbish.Unless PO BXI means something.https://www.dcode.fr/baudot-codeAlso 1956 is the year Electrologica was founded, and their first computer is the X1.https://en.wikipedia.org/wiki/Electrologica
(DIR) Post #ARHbXPr9VICEY6LMNU by Sophistifunk@noagendasocial.com
2023-01-04T00:40:13Z
0 likes, 0 repeats
@victorgijsbers the top diagram is a magnetic core. I have one from a Soviet PDP clone hanging up in my loungeroom as art. The Bottom is gray code I think. The right is some kind of v/i graph, maybe for a single transistor.
(DIR) Post #ARHwsRMXCHJ6L4t9zk by mangeurdenuage@shitposter.club
2023-01-04T04:39:18.854094Z
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@victorgijsbers I'd say this related with knitting.
(DIR) Post #ARIANZzmRrxbUkQMyG by RA_Negm@mastodon.social
2023-01-04T07:10:33Z
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@penguin42 @victorgijsbers I think that it is a Baudot/Murray representation, too. But why it is alternating in to diagrams.Another interpratation is that it is the configuration of a crossbar switch. But again: Why is it alternating?BTW: 5 lines can be musical notation (staff). Unlikely …
(DIR) Post #ARIZjNDl7dox6HS3qi by Cage_L33@poa.st
2023-01-04T05:51:24.563351Z
1 likes, 0 repeats
@mangeurdenuage @victorgijsbers I knit, this doesn't look like anything to do with it unless you mean something besides the textile art.My first thought was that it was a chord chart. That's the right amount of lines for a staff i.e. sheet music. It could also be some sort of diagram for a logic gate...? That's just off the cuff I don't have any clue about that area. Picture is an old knitting pattern. Mostly this stuff is transcribed too. Like "k4 p1 k2tog then purl until end of rows 1-16."
(DIR) Post #ARIZjOT2UJdaxxbmIy by Cage_L33@poa.st
2023-01-04T05:54:09.353311Z
1 likes, 0 repeats
@mangeurdenuage @victorgijsbers And some random picture of chord charts.