Re-visiting the “corporate handheld” computer that is the Psion HC120,
Tag Archives: tech
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.
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 🙂
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.
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…
Psion MC400 ROM dump & emulation development
Emulating a Psion MC400 over 30 years later – a 1989 80C86 based laptop being brought back to life in MAME.
One of The Many Promises of 5G – Accurate Time Transfer
One of the many promises of 5G is accurate time-transfer. I spent a couple of days travelling around the North West of England testing exactly how accurate available time transfer was from commercially deployed 5G installations.
A SIP trip down memory lane… back to Asterisk PBX & VOIP
A long time ago I built a VOIP PBX. I’ve been wanting to build & use another for a long time and finally got round to it with a £10 Cisco phone and £14 USB dongle…
Using a 30 year old laptop in 2021: The Psion MC400…
A summary of all the things that are right with my 1991 Psion MC400 laptop, “online” via an attached Raspberry Pi 3B+ and wifi…
My Linux life: a retrospective
As of July 2021 Linux has been around for 30 years. For almost all of that time I’ve been installing Linux on just about anything I possibly can….
Psion MC400 – retro computing via RS232 to Raspberry Pi – handshaking fixed…
Getting the 1990s era Psion MC400 laptop online via an attached Raspberry Pi and some custom shortened Psion serial-USB cables… Tweets, Emails, BBC News & screenshots! All in glorious monochrome and at 19200 baud 🙂
5G on the moon?
NASA has ambitions to build a comms infrastructure on the moon using 4G LTE technology…
Room 7609 