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The Psion Documentation Project

Welcome to the Psion Documentation Project

Take a look at the Books to get started! This is the Psion Documentation Project. It is currentl...

Device driver interfaces

This document describes all known functions for all known device drivers. It does not include fil...

Filesystem IO Interfaces

This document is based on FILEIO from The Psionics Files. This document describes the use of the...

Format of Flash and ROM SSD cards

Introduction This document describes information about the structure of existing types of Flash ...

EPOC16 Kernel memory organisation

This document is incomplete. Questionable sections are marked with an at (@) symbol. Kernel memo...

EPOC16 System Calls

Introduction The Psion System 3 operating system offers a large number of system calls. A syste...

EPOC16 Window Server Calls

This file wouldn't have appeared for much longer if it weren't for Dan Ramage, who sent Clive eno...

EPOC16 Environment Variables

EPOC16 always places a dollar sign ($) in the names of the environment variable it uses. Other ap...

SIBO ASICs

ASIC stands for Application Specific Integrated Circuit. These devices are widely used within Psi...

SIBO-SP Slave IDs

  "Select" is kind of a misnomer, because in actual fact it's a question. The SIBO/EPOC16 device...

SSD Pins

Facing pins, front of SSD upwards. Pin Name Description Characteristics 1 CLK...

EPOC16 Processes and Their Properties

EPOC16 is a preemptive multitasking operating system; at any time it can be running any number of...

EPOC16 Locale Codes

Psion allocated a number for each locale. This number is often used as part of a file name; for e...

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