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.
Category Archives: psion
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 😦
Retro & Online – Connecting Psion’s MC400 & Series 3a machines to “the internet”
Connecting 30-year old computers to the internet in 2021… for the LOLs. Revisiting RS232, null-modems and the like, all at 19200 baud.
Psion Series 3a vs. Technics RS-B665
Controlling my 1990s Technics tape deck from a 1990s PDA – Psion Series 3a remote control via NodeMCU
Retrocomputing – getting re-acquainted with the Psion Series 3a and MC400
Retro computing. Getting 1990s era computers connected to modern stuff….
MCMF – MF4 dialling for the Psion MC400
Adding MF4 (DTMF) dialling capabilities to the legendary Psion MC400 laptop from 1990
Room 7609 