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- Chapter 1
The Psion Organiser II is a pocket computer that comes with a language
(Organiser Programming language or OPL), several applications, mass storage
and RS232 capability.
The language OPL allows machine code, memory resident extensions. It has
database facilities for saving and retrieving data in a structured way.
OPL code automatically overlays through the procedure structure. The code
is translated so the language runs very rapidly, on many applications it
runs faster than an AT running GW BASIC.
The applications that come in the machine's ROM include a simple database,
diary, calculator and alarms.
Mass storage devices can be plugged in either of the two slots on the side
and includes 8K, 16K, and 32K datapacks without page counters, 32K, 64K and
128K datapacks with page counters. 32K Ram packs (not a consumer item).
The top slot is available for hardware/software devices. Psion has
released an RS232, a bar code reader and a magnetic card swipe. A number
of third parties have already developed hardware devices.
Behind these features, whose use is fully described in the Operating
Manuals, lies the operating system and hardware. This document gives a
complete description of how the operating system and hardware work
together. The developer can then fully utilize the features offered and
The intended audience are:
1. Application programmers working in OPL (AP).
2. Application programmers working either exclusively in machine code
or a mixture of OPL and machine code (MC).
3. Hardware developers (HD).
These titles are used loosely but indicate the general audience intended.
CHAPTER NAME SUGGESTED AUDIENCE
AP MC HD
2. SYSTEM BOARD X
3. POWER SUPPLY BOARD X
4. TOP SLOT BOARD X
5. OPERATING SYSTEM X X
6. MEMORY USAGE X X
7. KEYBOARD X X
8. DISPLAY X X
9. DATAPACKS X X
10. SYSTEM TIMING X X
11. EXTERNAL INTERFACING X X
12. FILING SYSTEM X X X
13. UTILITIES X
14. EDITOR X
15. MATHS FUNCTIONS X
16. MENUS X
17. LANGUAGE X X
18. TABLE INTERPRETER
19. DIARY X
20. BUZZER X
21. ERROR HANDLING X