Found on http://www.aaronsplace.co.uk/blog/2018-04-03-gpib-arduino.html

Some fairly major (and frankly rather overdue) changes are coming in the way that users access the GPIO pins on the Raspberry Pi. The shift will (hopefully) be fairly gradual and, for users of certain libraries, entirely invisible. However, for others they may be quite disruptive. As forewarned is forearmed, hopefully this little article may be of some use to those affected!
See also https://waldorf.waveform.org.uk/2022/the-one-where-dave-breaks-stuff.html
Found on https://ubuntu.com/blog/ubuntu-22-10-on-the-raspberry-pi-delivers-new-display-support-and-the-full-micropython-stack

Just one of the many interesting articles written by Ken Shiriff, who also has chip photos together with detailed information about the corresponding circuit, e.g.
https://www.righto.com/2022/04/reverse-engineering-lm185-voltage.html

Mostly chip photographs. Found on Bunnie H's blog https://www.bunniestudios.com/blog/?p=6656

After reading https://forums.theregister.com/forum/all/2022/05/06/pi_pico_transputer_code/, I was looking for information related to transputers and found this page.

The point-to-point technology to link transputers was formalised in the IEEE 1355 standard. This was further developed under the ESA into SpaceWire, which is now designed into a number of space missions under development in Europe, the USA and Japan. A key player in developing SpaceWire was Paul Walker from the transputer team whose company, 4Links, is now selling SpaceWire test equipment.

XMOS mentioned on the page can be found on https://www.xmos.ai

Discussion about calibration of the local oscillator frequency of the bullseye LNB
https://github.com/g4eml/Bullseye-Calibrator

Open source hardware design for a Hardware Attached on Top (HAT) GNSS receiver based on Septentrio Mosaic modules.
Nice description of some circuit and layout details.

AC Frequency Monitor
Panda display panel for a simulated pdp-10 http://sparetimegizmos.com/Hardware/Panda.htm found on http://panda.trailing-edge.com/

Hat for Raspberry Pi with a number of sensors:
BME280 temperature, pressure, humidity sensor
LTR-559 light and proximity sensor
MICS6814 analog gas sensor
ADS1015 analog to digital converter (ADC)
MEMS microphone (datasheet)
0.96" colour LCD (160x80)
Connector for particulate matter (PM) sensor (available separately, see https://shop.pimoroni.com/products/pms5003-particulate-matter-sensor-with-cable?variant=29075640352851 )

Air Quality Station v0.9 on a Breadboard
Measuring & plotting : °C, %rel.H, Pa, NO₂, C₂H₅CH, CO, CO₂, VOC, PM1, PM2, PM4, PM10 also: Count Particles of Sizes: 0.5, 1, 2.5, 4 & 10µm
See https://wiki.seeedstudio.com/Sensor_gas/ for gas sensors