ROUGOL logo Welcome to
RISC OS User Group Of London



ROUGOL is a not-for-profit organisation consisting of Acorn/RISC OS computer users in London and the south-east. Our aim is to bring those users together. There is no membership fee and entry to all meetings is free. To find out more, email us.


Meetings are held on the third Monday of every month. Most meetings feature a guest speaker, demonstrating the latest hardware or software, giving tutorials of software both new and old, or simply to kick off discussions on the current hot topic. Entrance is free, so why not come along and say hello?

Next meeting - Monday 20th March 2023 
MetaSprite, IFR, and more - Nemo

Nemo has been in and out of the RISC OS world for many years, but even when keeping his head down he has continued to use RISC OS daily on VirtualRPC, and has developed many useful tools, patches, and upgrades for the OS. Recently he has been been working on a reimplementation (and enhancement) of RISC OS Select's Image File Rendering (IFR) system. It is not ready for release yet, but some of the related tech is already available and will be demonstrated during the meeting.

Nemo will take us on a journey through MetaSprite, CompressedImage, IFR, and the new Qoi lossless compression bitimage format, which are all connected via RISC OS tech. In other words they're not just things running on RO, but are woven into RO at the API level. CompressedImage sits on SpriteV, uses MetaSprite + another interface to recognise (and generalise) Acorn's sprite compression scheme which it implements via IFR that, in the example case, allows a Qoi-compressed sprite to be displayed, gamma-corrected by interrogating the Monitor module. (That will all make more sense by the end of the meeting!)

You can read about and download some of Nemo's projects here.

Note: This meeting will be online only due to refurbishment work at our venue.

Click here for more details

Future Meetings
20 Mar: MetaSprite, IFR, and more, Nemo (online only)
17 Apr: History of Sibelius, Ben Finn, original author (in-person only)
15 May: TBC
If there is a topic you would like to see covered at a future meeting, or (even better!) if there is a subject you would like to talk about, please contact us.

Recent Meetings
February: South West Show preview
January: RISC OS Developments News, Richard Brown and Andrew Rawnsley
November: Right On Commander Mark Moxon, ex-editor Acorn User
October: Pinebook Pro, Andrew Rawnsley, R-Comp
September: Cancelled for Queen's funeral
August: Summer Party!
July: Desktop Modernisation Engine, Paolo Fabio Zaino
June: RISC OS 35th Birthday, Liam Proven + special guests from Acornsoft

Click here for a full index of past meetings, reports etc...
If you see a topic that hasn't been covered for a while that you think needs revisiting, please let us know.