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 🙂
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
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.
Grafana, Influxdb & DS18B20 based home temperature monitoring with Raspberry Pi
An update on the Raspberry Pi/Grafana/Influxdb/DS18B20 home temperature monitoring network I first put together in 2020…
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.
10 years of Raspberry Pi
So the Raspberry Pi has been around for 10 years… everyone’s favourite credit-card-sized computer does just about everything
The Psion MC400 EROS – Tandy TRS-80 model 200 replacement?
A look at what state-of-the-art mobile text processing for journalists was like in the mid 1990s – the Psion MC400 EROS system.
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…
Borked Signage
In honour of the regular El Reg feature which looks like it’s coming to an end… here’s my tiny collection of borked signage:
Emulating the Psion MC400
I read an online post about creating an “MC400 emulator”. That got me thinking about the ROM, and the 28F010 flash chips that realise it…
A Tale of Two Sources: NASA vs. Braben & Bell
Comparing comments (or the lack of them!) in software from 1969 & 1984. NASA’s Apollo Guidance Computer versus Elite for the BBC Model B 🙂
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About Room 7609
Hi, and welcome to Zed Starr’s compendium of techno-bizzle. Sometimes a bit retro, or getting retro stuff to do things in “modern life”; featuring Raspberry Pi, Linux, GNSS, analogue audio/Hi-Fi, old Psion computers and with an overall electronics flavour. And no, I’m not sure exactly what “techno-bizzle” is either… Enjoy!
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Room 7609 