psion – 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.

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

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…

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.

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.

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…

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…

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 🙂

RS232 flow-control & handshaking – Psion MC400 retro communications

Connecting my retro-laptop to the internet via 2 x RS232 serial connections to a Raspberry Pi… and defeated (for now) by lack of hardware flow-control signals 😦