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philpem

@philpem@digipres.club

Software preservation, electronics, software and ham radio - a maker of things!

Pronouns: https://pronoun.is/he/him

Website: https://www.philpem.me.uk

Current projects:
LF radio navigation - #Datatrak
DIY cable TV headend - #AnalogCable
#HackTV (TV signal generator for SDRs) - video scrambling modes
Acorn/#RISCOS software preservation (#DigiPres)

Tags: #electronics #HamRadio #Machining #Metalworking #RetroComputing #HardwareHacking #ReverseEngineering #ICRE #Maker #DigiPres

Dieses Profil is von einem föderierten Server und möglicherweise unvollständig. Auf der Original-Instanz anzeigen

philpem , an Random Englisch
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Happy days, I've finally fixed the spacebar on my keyboard. Turns out the keyswitch had a dodgy spring or plunger. The new one even clicks!

philpem OP ,
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@darkrat That idea is cursed, evil, and I'd love to see what happens when someone tries to use it. I guess it could work okay if there was some kind of order to the randomness.
meanwhile I'll just sit here tapping away on my MX Blues and annoy you with the clicking!

philpem , an Random Englisch
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The Parable of the Special Part

Jones and his manager Mr. Smith were in a design review meeting.

Jones was a bundle of pure enthusiasm: "The new Metroencabulator is the best we've ever made!"

Smith was unmoved. "Why do you have 19 different M3 bolt lengths, and why are some custom?"

"That's just how it is, sir," Jones said. "We need those sizes to reach the design goals."

"Jones," replied Smith, "There is plenty of room to drill these holes deeper. Then we can use all standard size bolts!"

philpem OP ,
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Jones's eye twitched. It always did that when he was surprised.

"Sir, I appreciate your input, you have been with the company for 30 years, but I don't see why it's necessary."

"Jones, I know you mean well, but each one of these custom bolts is something Field Service and Production will have to stock. We'll have to train everyone to watch out for subtly different lengths of bolt. Mistakes will be made - there's only 40 thou between some of them! Nobody can tell them apart by eye!"

philpem , an Random Englisch
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Meanwhile, while I'm on a bender this evening - I just found this neat tutorial on using Zynamics with Ghidra, via the plugin:
https://www.0x90.se/reverse%20engineering/install-binexport-and-bindiff/

I'm planning to give this a go - while I had access to IDA+Bindiff, I used it a fair bit.

Edit - in case you missed it, BinDiff and BinExport are also now open-source:
BinDiff: https://github.com/google/bindiff
BinExport: https://github.com/google/binexport

philpem , an Random Englisch
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Z80 ICE acquired! The won't know what's hit it. Thanks again, @rc2014 !

philpem , an Random Englisch
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You know what #EMF2024 #emfcamp needs?

Cable TV.

philpem OP ,
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@sam @scarlet I would be very interested in old cable TV equipment!
I'm doing a talk about building a cable headend on Stage C in about an hour:
https://www.emfcamp.org/schedule/2024/203-being-elliot-carver

philpem OP ,
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@zxguesser @robert If there's nothing left, I have been modifying Broadcast Projects Teletext receivers to give them more capabilities. I'm pretty sure the EURO-CCT chips can do datacast.

philpem OP ,
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@foone oh heck yeah. I had a brief look at videocipher and figured there wasn't enough info out there to make a scrambler. I guess you found more than I did!

philpem , an Random Englisch
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In case you missed it, I've got a spiffy new logo for my slides and PCBs. This is Chaos the dragon!
https://meemu.org/@quesadillawizard/112493013282894564

philpem OP ,
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And here's what he looks like on my talk slides :)

philpem OP ,
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@foone If you do, I need one too! :D

foone , an Random Englisch
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this electrical device is a special sort of terrible: They labeled the polarity of the DC power jack, but not the voltage (or current, for that matter)

philpem ,
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@foone 9 to 12 depending on heatsinking, aye. Works down to seven and a half.

philpem , an Random Englisch
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Does anyone know if there were alternative character generator ROMs available for the IBM MDA/Hercules adapter?
I have a Paradise Color/Mono Card [1] with a socketed 27C64, it'd be fun to have some switch-selectable alternative fonts.

1: https://www.dosdays.co.uk/topics/Manufacturers/paradise/color_mono_card.php

#retrocomputing #RetroPC

philpem OP ,
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@foone aha! I knew someone had done this. I was more curious if it was a thing people did back in the day - like swapping the alphanumerics for OCR A/B.

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