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Post AvADgAgGDVeSmBeRbk by [email protected] |
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Post #AuAR6S5vLbJXuw0AUq by [email protected] |
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Tape drive repair at the Computer History Museum. I helped @tubetime figure out… |
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Post #AuAR6SE4rHpuKDogCm by [email protected] |
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@kenshirriff backspace? as in its a byte-writeable tape? |
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Post #AuAR6SnWjUC06AOzSa by [email protected] |
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The IBM 1401 was the most popular computer of the early 1960s. It has rows and … |
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Post #AuAR6TDPBGtPOQVenQ by [email protected] |
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Unfortunately, the computer sat in an unheated garage in Germany for many years… |
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Post #AuAR6TdzaQ9yiswtEm by [email protected] |
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We tracked down the fault to this circuit board and found the transistor in the… |
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Post #AuAR6U5Hwvzi5Xigme by [email protected] |
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Transistors in a matchbook? We considered replacing the bad transistor with one… |
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Post #AuAdDcWo9X5PkmlFDM by [email protected] |
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@kenshirriff Do replace them with another germanium transistor? |
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Post #AuB2A6xHa7fboiZGEq by [email protected] |
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@kenshirriff It would be great if curiousmarc bridged to mastodon (@ap.brid.gy)… |
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Post #AuB2A73JDiUU7PO4dE by [email protected] |
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@bitsplusatoms @kenshirriff @tubetime Yes please! 🙂🖖 |
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Post #AuHZFgewixn5R417U8 by [email protected] |
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@lopta Yes, we replaced the transistor with another germanium one. |
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Post #AuOcPfSBiomoYpDgcS by [email protected] |
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@davidmc No, the tape drive is record-based, so backspace skips over a record b… |
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Post #AvADg8gtcAyIbZvvJw by [email protected] |
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@kenshirriff can I ask where in Germany? |
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Post #AvADg8oh9BD4zla9Tc by [email protected] |
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@Peternimmo The IBM 1401 computer was stored for 16 years in a garage in Hamm, … |
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Post #AvADgAgGDVeSmBeRbk by [email protected] |
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@kenshirriff thanks. I had a family member in Germany involved in a similar pro… |
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Post #AvADhHM6svX1lfkpHM by [email protected] |
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@kenshirriff @CuriousMarc I see only transistors and resistors .. RTL logic ? |
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Post #AvADhHS8WWLu4MZdfk by [email protected] |
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@gilesgoat @CuriousMarc Yes, this is RTL logic. Other parts of the 1401 compute… |
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Post #AvADhWa8H4f2zVQjia by [email protected] |
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@kenshirriff That really does make you appreciate what a jump the integrated ci… |
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Post #AvADhWg9ufTvICFY6y by [email protected] |
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@arafel The integrated circuit wasn't just smaller than the circuit card; i… |
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Post #AvADhWmtVcrxd5Ovbs by [email protected] |
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@kenshirriff @arafel IIRC, they really like to operate with strange negative vo… |
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Post #AvADhWtd6aFzxyYJ6m by [email protected] |
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@tommythorn @arafel IBM never met a voltage it didn't like. The 1401's … |
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Post #AvADhsppXOI20YwaEy by [email protected] |
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@kenshirriff I'm curious... Have you used any modern production transistors… |
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Post #AvADhsvrAz6uJFlOdM by [email protected] |
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@sb Yes, we have used modern transistors if we can't find a suitable replac… |
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Post #AvADiaiEP0M65jj8VM by [email protected] |
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@kenshirriff fascinating.I know you’re likely trying to keep it all original … |
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Post #AvADiaoG2bAyOQXwtk by [email protected] |
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@linux_mclinuxface The characteristics of this card aren't too critical, so… |
