Psion Organiser II - ROM Version Checking

In order to find out the model and ROM version of your Organiser II, follow these steps:

 

1. Switch on and open CALC.

2. Type in PEEKW($FFE8) and hit EXE.

3. This will return a number. Look it up in the following chart:

 

e.g. 54 would be a Model CM with ROM version 3.6.

e.g. 273 would be a Model XP with ROM version 1.1.

 

Number returned Model and ROM Version
0-255 CM, ROM Version 0.0 to 15.15 (0.0 to 0.15 in 0.01 increments, then 1.0 to 1.15 in 0.01 increments, etc)
256-511 XP, ROM version 0.0 to 15.15 (0.0 to 0.15 in 0.01 increments, then 1.0 to 1.15 in 0.01 increments, etc)
512-767 XP/LA, ROM version 0.0 to 15.15 (0.0 to 0.15 in 0.01 increments, then 1.0 to 1.15 in 0.01 increments, etc)
3328-3583 LZ64, ROM version 0.0 to 15.15 (0.0 to 0.15 in 0.01 increments, then 1.0 to 1.15 in 0.01 increments, etc)
3584-3839 LZ, ROM version 0.0 to 15.15 (0.0 to 0.15 in 0.01 increments, then 1.0 to 1.15 in 0.01 increments, etc)