martinOlivier Gossuin's website seems to have closed, so I'm posting his schematics for the rampak and datapak here:
RAMPAK 32K
DATAPAK 32K
Rampak and Datapak schematics
A project log for PSION II Datapak and Rampak Reader/Writer
File transfer between a PC and a Psion Organiser II using an Arduino
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