Where to download PsiWin 2.3.3 Psion software

PsiWin installed under Windows 10 Pro

One question I get asked a lot is where can I download PsiWin, the official Psion software that connects your Psion palmtop computer to Windows. This post answers that.

Psion palmtops

There appears to be a bit of a retro resurgence of interest just now in the old Psion palmtop computers. Between 1996 and 2008, I was a proud Psion user of the Siena, Psion Series 3c, Psion Series 3mx, Psion Series 5mx and Psion Series 7 (upgraded with a netBook personality module); I even owned a Psion Revo just to see what they were like. I sold all my Psion hardware in 2017 as life was taking me in a different direction and I’d not used any of the machines fully for nearly ten years.

Where can I download PsiWin 2.3.3?

Most weeks I get at least one email from someone asking me where they can download the PsiWin connectivity software. I thought it would be useful to link to these downloads.

Note that the German/Deutsch version is 2.3.1 not the later 2.3.3; I don’t know if there ever was an update.

For completeness, here is the entire collection of 16-bit PsiWin 1.1 (updated for Y2K) in Deutsch, English, Français, Nederlands, and Italiano:


No technical support

Unfortunately, I can’t offer any technical support for PsiWin connectivity. I don’t have any Psion devices any longer.

Installation issues

I have recently had issues installing PsiWin 2.3.3 English on my Windows 10 Pro (64-bit) desktop machine, but it installed fine on my Windows 10 Pro (64-bit) laptop. Using Process Explorer, I narrowed the problem down to an application related to my NVIDIA graphics card and when I closed that process, the installation completed successfully.

32-bit vs 64-bit

Bear in mind that if you are running a 64-bit version of Windows, PsiWin 2.3.3 is a 32-bit application so it will not integrate fully into Windows Explorer the way it does under a 32-bit version of Windows.

Also, during installation, you may encounter an error message saying that it cannot install the 16-bit elements of PsiWin. This is understandable. Windows 10 64-bit doesn’t support any 16-bit software (without using something like DOSBox). Just acknowledge the error and carry on. It won’t affect the application.

Connecting to the Psion

Hmmm… this is actually one of the reasons that I stopped using my Psions. It became too burdensome to work out how to connect.

I had a hardware RS-232 serial port and also a handful of USB-to-Serial adapters. But PsiWin appears to be very particular about which adapter it accepted. I found the Videk 2499G to be fairly reliable.

At one point, after I upgraded to a 64-bit version of Windows, I was dual booting to a 32-bit version of Windows 7. Then I relied on a virtual machine but even that became too much hassle, to keep an entire operating system up to date within a VM just to connect to my Psion.

If you do manage to get things connected, one piece of advice is that Windows likes to have the baud settings for your serial COM port as high as it will go, rather than the Psion default. So, for example, the Psion 3mx connects at 57,600 baud. On my Windows 98se machine I would set the COM1 port setting to match this setting (i.e. 57,600). However, under Windows XP it likes COM1 to be set to its maximum value.

Converting Psion files

One of the main reasons that I’ve found people wanting PsiWin is to convert old files. This still works and is a standalone application and assuming a standard installation can be found at: C:\Program Files (x86)\Psion\PsiWin\Cpycnv.exe.

Psion File Converter

On the older, 32-bit machines (Series 5, 5mx, 7 and netBook), the easiest way to retrieve files from the Psion is to copy them from the machine to a Compact Flash (CF) card and then transfer them using a USB-to-CF adapter.


I hope this is useful to some people. I will add to this post as I remember things and as questions continue to trickle in from people about PsiWin. Also, if you find something helpful please do leave a comment.

Published by

Gareth Saunders

I’m Gareth J M Saunders, 52 years old, 6′ 4″, father of 3 boys (including twins). Enneagram type FOUR and introvert (INFP), I am a non-stipendiary priest in the Scottish Episcopal Church, I sing with the NYCGB alumni choir, play guitar, play mahjong, write, draw and laugh… Scrum master at Safeguard Global; latterly at Sky and Vision/Cegedim. Former web architect and agile project manager at the University of St Andrews and previously warden at Agnes Blackadder Hall.

9 thoughts on “Where to download PsiWin 2.3.3 Psion software”

  1. thanks Gareth, a longterm user of Psion products but hadnt used one for a while. I decided i needed a pocket device without internet access to get back into writing. Anyway mostly an apple user so always been an issue so finally got myself sorted by purchasing an old toughbook with win 10, they still have serial ports and hey presto apart from 16bit issue works like a charm. Thanks again for maintaining this page

  2. Hi,

    I bought a Psion Series first Gen 3 back in the day. I ended up selling it for whatever reason.

    A couple weeks ago I bought a Psion Series 3 and the 3link cable plus a usb to serial port adapter. I also a Linux Eeepc 701 and installed Windows XP.

    I tried getting connected and it just wouldn’t connect, I also tried it on a 64bit laptop running Win10 connected a couple of times and that’s about it

    Can’t get it to connect at all now.

    I only want to play Jumpy and a few freeware games on it.

  3. Thank you for all your information. I am new to Psion world and your website is being extremely useful for me. I got my 5mx last week, and got an old compatible CF card in a second-hand photo-stuff shop. I have just done my first conversion to Office Word very easily thanks to you.
    I am in fact a Dana Alphasmart fan, because of its fantastic keyboard. It will still be my first election for distraction-free writing. However, the 5mx is far more portable. Besides, the Dana cannot directly convert to Word. The only main drawback I find in the Psion is the keyboard, which is too small, and the keys don’t feel confident. But it is really portable!

  4. Hello,
    my name is Volker and I´m looking for help with a Psion MX5 Pro I bought, unfortunately without boot CF card.
    I tried to install with rominst application, but this isn´t connecting to my Psion. It only works with Hyperterminal, what is really annoying.
    When I format a CF card in my Psion and copy the romfile on it, an error message pop up, corrupt card.
    My question, can you supply me with an image of a bootable cf card?

      1. Funnily enough while I was on holiday I went into a random second hand shop and saw a Psion Series 5 mx for £40. I didn’t buy it at the time. I went for a drink with my wife and said I wish I’d have at looked at the Psion, she suggested going back and having a look and it was immaculate so I bought it. One thing to note that it was totally untested, I could have bought a £40 paperweight. Bought some batteries and it booted up fine, got home from my holiday and I replaced the cr2032 back up battery. I then bought a 2.0gb CF card it arrived but couldn’t get it to read the card, watched a video on YouTube and I followed the steps. I sent the card back as faulty or it was too big for the Psion to handle, I posted on the Facebook Psion Users Group, I bought a SanDisk 512mb CF card from Ebay.
        I put it in and it still didn’t read so put a partition in of about 20mb and I realised that I’ve been putting the card in the wrong way round. I put it in the right way and it recognised the card. I got to work by downloading some games, I installed them and game works. I can now play Jumpy.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.