Tag 2 auf dem Vintage Computer Festival Europa in München #VCFe
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Andreas Bombe
@andreasbombe
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Sometimes Debian Developer, sometimes digging through ancient schematics.
Gave that ol' Twitter a short look today, first in a long while, and straight away I come across #ScottAdams namesearching himself.
Adventures in designing an interface to a DEC terminal keyboard:
What does "signals are reversed at the monitor" mean exactly? Are the serial in/out names also reversed? Why are pin numbers listed in reverse on the monitor side? Is only the numbering reversed? On top of that, why is the pin numbering apparently opposite to how everyone making RJ connectors numbers them?
Had one of these LED badges around that hadn't been used for years, tried recharging but it wouldn't turn on.
My guess was that the microcontroller was stuck from a low voltage condition. Opened it up, battery is soldered on so instead looked up the datasheet for the microcontroller to find the reset pin.
A bit of probing and shorting it to the conveniently located ground pin next to it and it works! Complete with vintage pre-pandemic stored messages.
War gestern auf der #AuerDult und hab mal eben ein Stück mechanisches #retrocomputing gekauft.
Asked it to write a logical OR in PDP-8 assembly and it simply invents an instruction that solves its problem.
Just tried ChatGPT for the first time and wanted to see how well it fares off the beaten path and asked if it can write PDP-8 assembly.
Well, the general info looks good, but the assembly it so confidently presents as an example is unfortunately not PDP-8 assembly… In fact only HLT is a genuine PDP-8 instruction, also the apparently octal 12 bit addresses would be a good match. LDA and STA look more like 6502 instructions.
