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Post AvLFJQuu1REt7PLQS8 by [email protected] |
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Post #AvJHZ4huAycWShvomm by [email protected] |
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Last week, the vintage IBM 1401 computer at the Computer History Museum started… |
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Post #AvJHZ4ozkcI8ohFTpw by [email protected] |
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@kenshirriff Classic case of "You're holding it wrong" |
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Post #AvJHZ5MJkiwkU2q5mC by [email protected] |
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The IBM 1401 computer lets you run code a single cycle at a time, so you can se… |
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Post #AvJHZ5k4KPwffhx3nU by [email protected] |
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I hooked up an oscilloscope and discovered that the computer wasn't running… |
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Post #AvJHZ66OzNoGmyOtbk by [email protected] |
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You push the green START button on the console to start the computer after a HA… |
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Post #AvJHZ6SNffOHt8gRrk by [email protected] |
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It turned out that the computer's START button had a strand of wire that sh… |
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Post #AvJHZ6pmGg6d3hd8Km by [email protected] |
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With the switch fixed, everything worked. At least until next time...I worked o… |
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Post #AvJYLFObKzbQmLtWnA by [email protected] |
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@kenshirriff I wish there was such an easy way to find and fix the troubles I&#… |
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Post #AvJb9boETlDagF1dY0 by [email protected] |
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@kenshirriff Ah, I was guessing a failed capacitor in the debouncing circuit. |
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Post #AvKPGj5Morpqyzcx1s by [email protected] |
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@kenshirriff That's a fascinating look into old tech, thanks! |
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Post #AvLF6oaIiO6ol3gvlw by [email protected] |
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@kenshirriff My Dad programmed these things in the early 1960s at Liberty Mutua… |
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Post #AvLF89EBRujb4UywK0 by [email protected] |
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@kenshirriff That wasn't a START button, that was a START MISBEHAVING butto… |
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Post #AvLF8IgAJFSsNt8uga by [email protected] |
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@kenshirriff My favourite CPU is the PDP-10 KI CPU, that not only let you run s… |
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Post #AvLF8InbrZQ4kycrI0 by [email protected] |
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@ahltorp The IBM 1401 lets you load memory from the toggle switches, which is c… |
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Post #AvLF8IuhRD5h6xwWLA by [email protected] |
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@kenshirriff If you by toggle switches mean switches with two physical position… |
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Post #AvLF8J153UC9QkvcHo by [email protected] |
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@ahltorp @kenshirriff I had a front panel for one of those as a kid. My brother… |
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Post #AvLF8JydU3pkPSnB7A by [email protected] |
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@kenshirriff The PDP-10 KI is also one of the few mainframes I’ve worked with… |
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Post #AvLF9rlrKAefVdYKWm by [email protected] |
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@kenshirriff @CuriousMarc @tubetime A classic case of turn it on, and then turn… |
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Post #AvLFAvzz5hAauYfXhw by [email protected] |
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@TimWardCam Excellent guess bud! :-) @kenshirriff |
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Post #AvLFCZMqCkSvIh8irA by [email protected] |
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@kenshirriff as a bicycle repairman i can tell you it needs a little spit of wd… |
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Post #AvLFD3HuxcLw674DLc by [email protected] |
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@kenshirriff s/START/TURBO/g |
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Post #AvLFHjPkHIvXuMxYoK by [email protected] |
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@TimWardCam It turns out that the debouncing is more complicated than that. The… |
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Post #AvLFHnFxzbTvpCPo7k by [email protected] |
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@kenshirriff Nice lo-tech fault! |
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Post #AvLFHw7R2h0NJLUcZk by [email protected] |
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@kenshirriff As a kid I rolled around on the floor and napped by these. I defin… |
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Post #AvLFIhGbkPGjXP96tk by [email protected] |
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@kenshirriff this is too obvious but i cannot resist: so you basically solved t… |
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Post #AvLFJQuu1REt7PLQS8 by [email protected] |
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@kenshirriff I love the investigation story!But what blows my mind is these mac… |
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Post #AvLFL1wlpYYcFryobo by [email protected] |
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@kenshirriff At least it didn't catch fire after the HALT. |
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Post #AvLFMuQYl7JLVqoF96 by [email protected] |
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@ahltorp @kenshirriff Gould SEL, late 70s, had similar. |
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Post #AvLFPU6Z58O0kAgXC4 by [email protected] |
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@kenshirriff “it wouldn't halt.”Hustle culture is everywhere! |
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Post #AvLGQjSnZ2xccaF9ii by [email protected] |
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@ahltorp @kenshirriff My PiDP-10 replica, powered by a Raspberry Pi 5. All the… |
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Post #AvMCYZxwYSp6p5G1Ee by [email protected] |
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@kenshirriff This sounds similar to a bouncing switch, did those systems back t… |
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Post #AwSxQBmWUkiU5wgxBw by [email protected] |
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@CaaS https://oldbytes.space/@kenshirriff/114715119149787896 |
