Explaining compatibility issues between USB and retro Psion computers that use RS232 when using USB-RS232 adapters like FTDI & Prolific
Category Archives: tech
“These aren’t the ROMs you’re looking for…”
The latest MAME release (0.253) is the first to support some of Psion’s 16-bit (SIBO) architecture platforms. Series 3a/3c/3mx, Siena and Workabout/mx are now partially supported.
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 🙂
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.
Hacking up the Psion SIBO SDK DOS debugger
Poking around in the old Psion SIBO SDK debugger – which looks like it’s based heavily on the MC’s GUI…
Repurposing an old Psion MC400 laptop keyboard with Teensyduino & USB
Re-purposing an old Psion MC400 laptop mechanical keyboard from 1989 to work with USB via a Teensy LC (Arduino compatible) microcontroller