tech – Room 7609

Back to the source: Taking an emulated MC200 back to Psion’s old HQ in Harcourt St

Taking an emulated Psion computer back to its spiritual home – the MC400 emulation goes to Harcourt Street, London.

More retro Psion: The HC120 “corporate handheld”

Re-visiting the “corporate handheld” computer that is the Psion HC120,

LCD Cakes – can baking an old LCD screen really fix it?

Can baking an old LCD screen fix it? How about rubbing it with a cotton bud? I tried a couple of suggestions I found on the internet to fix blotches on an old Hitachi monochrome LCD screen from my 1989 Psion MC400 laptop.

Fedora 37 on Raspberry Pi4

Two of my favourite things – Fedora Linux and Raspberry Pi – combined on the Raspberry Pi 4 8GB 🙂

On CyberDecks…

Battery powered, portable – Raspberry Pi cyberdecks with tiny screens & keyboards…

Tiny oscilloscopes – revisiting the JYETech DSO138 and trying the Raspberry Pi Pico based “scoppy” on Android

Back in Jan 2021 I built the DSO138 tiny oscilloscope kit. Thought I’d dig it out and compare it with the more recent Raspberry Pi Pico based “scoppy” that uses the Pico’s A2D and an Android phone app to display the data

Raspberry Pi Supply Chain Issues – saying hello (again) to the Original Pi Model B Rev 2 512MB

If you’re struggling to find Raspberry Pi Zero (or Zero 2) boards for light IoT applications then an old Pi 1 512MB from 2012 might be the answer…

Tiny clock party – it’s not always about nanoseconds…

A selection of tiny clocks, sync’d a variety of ways – by hand or by (S)NTP/chrony. Featuring Raspberry Pi Pico, ESP32 and micropython.

Out and about with a laptop from 1989

I took my old (1989 vintage) laptop out for a coffee to send some tweets & emails 🙂

Powering old consumer electronics from USB

Using USB to power old mobile/handheld computers

Old Meets New: Analog (1G) TACS Cellphone meets Lime SDR

Bringing an old analog (1G) Cleartone CTN9000 mobile phone handset back to life with the aid of a software-defined radio (Lime SDR) and osmocom_analog.

Phoney – Psion Series 3a spoof voice calling from 1996

An app written in 1996 to simulate making voice calls from a Psion Series 3a.

Siemens Nixdorf Scenic Pro C5

5250 days later – booting an old pentium computer that’s been in storage for ~14.5 years. This filthy beast used to be the defender of the home network running the Smoothwall GPL firewall.