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A project log for Getting online with a 1987 Psion Organiser II

Bringing an Eighties handheld classic into 2019 with a little help from a Raspberry Pi. At least, that's the idea.

James FosseyJames Fossey 06/08/2019 at 20:560 Comments

So this week I've soldered the low-voltage side of the SparkFun converter board 'onto' the Raspberry Pi. I've let four long leads run freely from the high-voltage side of the board that can be pushed into the pins of the Psion top slot (breadboard-style!)

I've put the connections so far into a table. Now I need to put a fresh Raspbian Lite on the Pi and try to work out how to 'use' the Psion top slot. I believe it has 3 general purpose pins that can be read and written to using some kind of machine code. This page is proving very interesting https://www.jaapsch.net/psion/topslot.htm#p16.

PiLogic level converter
(low voltage side)
Logic level converter
(high voltage side)
Psion
Top Slot
Pin 1 (3.3V)
Low Voltage reference
(LV)
High Voltage reference
(HV)
Pin 13
(5V)
Pin 6 (Ground)
Ground
(GND)
Ground
(GND)
Pin 9
(Ground)
Pin 10 (GPIO15)
Low Voltage 1
(LV1)
High Voltage 1
(HV1)
Pin 15
(SOE)?
TBC
Pin 8 (GPIO14)
Low Voltage 4
(LV4)
High Voltage 4
(HV4)
Pin 16
(SMR)?
TBC


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