All these PDAs except the Psion netpad have a small keyboard, which excepting the Organiser, HC and Workabout was of the standard QWERTY layout, or a regional variation thereof. The Psion Series 3mx and Series 3c have a similar overall external appearance, except the 3mx sports a matte silver metallic paint covering, rather than the dark grey finish of the 3c. Port 2 data direction register. Bit 0 controls the direction of bit 0 of [port 2] (1=output,0=input) and bit 1 control the direction of bits 1-7 of [port 2].

In 1987, Psion launched the 'Comms Link' - a device that plugs into the Organiser at one end, and a 25-pin serial port on the other end. The Comms Link contains some on-board software for terminal emulation and file transfer, either via plain-text, XMODEM or Psion's own protocol. This allowed Organiser owners to connect their devices to their IBM-compatible PCs, or to modems etc. Needleman, Raphael (28 October 1991). "Psion: It doesn't get any more portable". InfoWorld. InfoWorld Publishing Co. p.82 . Retrieved 22 October 2023.Suffice to say this all relies on some slightly dodgy soldering, but I think it's a great improvement on last week's experimental arrangement. The entire device now fits in the palms of two hands! A menu appears with the options FILE, PROCEDURE, and possibly NOTES. To receive a data file such as A:MAIN, choose FILE. To receive a procedure (source code only), choose PROCEDURE. The NOTES option will only be available if you are using an LZ/LZ64 Organiser and a 4-line version of the Comms Link. Choose the NOTES option to receive an LZ notepad file. The Embeddable Linux Kernel Subset project has produced a small subset of Linux that runs on Psion Series 3 PDAs. [37] PDAs [ edit ] The Psion Series 3 models were a major advance on the Psion Organiser. They had an original way of managing files: the available program icons are shown in a horizontal line and the associated files display in a drop-down list beneath them. Manufacture of Psion 3s was discontinued in 1998 shortly after the launch of the Psion Series 5 (a Psion Series 4 does not exist, due to Psion's concern of tetraphobia in their Asian markets) and the Psion Siena. Psion's industrial hardware division continue to produce handhelds running the same 16-bit operating system, some 17 years after its introduction on the Psion MC range of laptops and 5 years after Psion Computer's final 32-bit EPOC PDA was released.

The company name is an acronym standing for "Potter Scientific Instruments", after the company's founder, David Potter. The acronym PSI was already in use elsewhere in the world so "ON" was added to make the name PSION unique, according to David Potter this was explained as his ambition was so strong that it was Potter Scientific Instruments - Or Nothing. David Potter remained managing director until 1999 and was chairman of the company until late 2009.

4-line Industrial Models

ORG2: Psion emulator, and an IDE for programming OPL procedures. For emulating the Organiser you can use Jape. the control signals properly, and we only need unidirectional communication, we can take a bit of a shortcut. I connected some digital