# Ada on the RSRE Flex operating system

**URL:** https://forum.ada-lang.io/t/ada-on-the-rsre-flex-operating-system/4717
**Category:** General
**Created:** [September 4, 2026, 4:48pm UTC](https://forum.ada-lang.io/t/ada-on-the-rsre-flex-operating-system/4717 "2026-09-04T16:48:09Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![Chris660](https://forum.ada-lang.io/letter_avatar_proxy/v4/letter/c/aeb1de/32.png) [@Chris660](https://forum.ada-lang.io/u/Chris660)
#### Post date: [September 4, 2026, 4:48pm UTC](https://forum.ada-lang.io/t/ada-on-the-rsre-flex-operating-system/4717/1 "2026-09-04T16:48:09Z")

</div>

I was watching this talk about the “Flex” operating system developed by the Royal Signals and Radar Establishment, and happened to spot a couple of scans taken from “Ada UK News” in 1985 that reference an Ada compiler in development for that platform:

[https://www.youtube.com/watch?v=yHtZG2GGUYg&t=1532s](https://www.youtube.com/watch?v=yHtZG2GGUYg&t=1532s)

The presenter doesn’t mention Ada at all (the talk is just about the Flex system), but I thought I’d post it here on the off-chance it’s of interest to someone.

edit: I found a paper with a bit more information about the Ada compiler: [https://archive.mg-1.uk/flex/rsre\_cc2\_memo\_304-87\_ocr.pdf](https://archive.mg-1.uk/flex/rsre_cc2_memo_304-87_ocr.pdf)