I've removed some ICs, put a socket in and added pin/header connectors between the PCBs. A Pico is currently replacing one T5006P ... https://www.youtube.com/watch?v=wefhQf8H8mM
I have a go at driving this ALPS printer plotter mechanism that I got recently. It has no electronics at all.
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https://www.youtube.com/watch?v=gj6BrnpXvRs
Latches to stop the tables on my JWP-12 thicknesser from falling down.
Thingiverse link:
https://www.thingiverse.com/thing:3512480
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https://www.youtube.com/watch?v=K-U8UShhUYY
This is a very sturdy aluminium cased calculator with a clock function and currency conversion. I can't find anything out about it though, so if anyone has information or a manual, i'd be very interested.
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https://www.youtube.com/watch?v=K5JSQfPJKng
This is a gadget for the Psion Organiser II that emulates a datapak using an OPK image on an SD card . Buttons and an OLED display allow the images to be selected.
It can also be a RAM pak, which can be written to SD card when required.
More information:
https://trochilidae.blogspot.com/2021/08/how-fast-is-modern-microcontroller-at_0393030349.html
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https://www.youtube.com/watch?v=ULiFXmy-RtU
The PRO-101 is in what is hopefully the final fixed form. The RAM is replaced by an RP2040 and there's a USB interface as well as a keyboard command interface for stand-alone operation.
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https://www.youtube.com/watch?v=w93zmpUBlWs
The Psion Organiser speech adapter uses an SP0256-AL2 chip to generate speech. This normally uses a 3.12MHz crystal, but what happens if you swap that crystal for one of a different frequency?
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https://www.youtube.com/watch?v=8ovY72LO8Cg
This part of the disk drive teardown covers the platter motor and the bearings of the head arm and the motor.
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https://www.youtube.com/watch?v=SnG50HIYgvU