That was a rebadged 3A, so with from 256kB to 1MB RAM as stock.
Psion did a 2MB model, but Acorn didn't.
As an owner of a 3 and 3A, the 3A was the usable version. The 3's screen was too small, and its storage meagre (but expandable, and I did.)
The 3A was 2x the speed, a much bigger screen with better contrast (but no backlight) and versions with up to 2MB were available, which for this class of machine was a vast amount of storage you'd never fill. Thing 2TB for comparison now, plus 2 drive bays for more if you need it. A laptop with 6TB? That is plenty for almost anyone.
A rebadged Psion Series 3.
https://chrisacorns.computinghistory.org.uk/Computers/Pocket...
256 kB RAM.
Psion 3:
https://en.wikipedia.org/wiki/Psion_Series_3#Psion_Series_3
Important note: the pic at the top of the Wikipedia article shows the later, improved 3A with a much bigger screen.
> the additional memory of the Psion 2
I do not understand this. The APB was a Psion (Series) 3. The Psion 2 (Organizer II) was an older, smaller device.
The S3 and APB take memory cards: 2 slots onboard, for Psion SSDs (NOT the modern usage of the term "SSD". See:
https://pulster.de/Psion-Solid-State-Disk-SSD-memory-cards
The Psion 3A had more memory. The 3C more still, and the 3MX more still.
When you say "Psion 2" do you mean Acorn Pocket Book 2?
http://superdecade.blogspot.com/2017/12/acorn-pocket-book-ii...
That was a rebadged 3A, so with from 256kB to 1MB RAM as stock.
Psion did a 2MB model, but Acorn didn't.
As an owner of a 3 and 3A, the 3A was the usable version. The 3's screen was too small, and its storage meagre (but expandable, and I did.)
The 3A was 2x the speed, a much bigger screen with better contrast (but no backlight) and versions with up to 2MB were available, which for this class of machine was a vast amount of storage you'd never fill. Thing 2TB for comparison now, plus 2 drive bays for more if you need it. A laptop with 6TB? That is plenty for almost anyone.