Acorn System 3, Flex System Software

[John_Newcombe]

I am trying to locate the Flex System software that was created for the Acorn System 3 (with 6809). I know discussions in the past have not located it, but thought that it might be worth asking again in the hope someone can help locate it.

[bprosman]

Maybe Roland knows ? He has Flex working on a 6809.

[roland]

I don't know it. I have FLEX running on my own 6809 board. I used the Flex Adaptation Guide to get it working. It's possible to write some routines to handle keyboard, display and disc I/O to get the FLEX OS working on Acorn System 3 (or other systems). Keyboard and display might be simple because you can easily translate the systems routines to 6809 code, disc I/O might be a bit more complicated - but still doable.

Unfortunately I don't have a system computer to work it out

[John_Newcombe]

Thanks for the reply. Trevor Hamblet has since sent me some details including some PROM changes that shift the VDU and OS in the memory map. When I get chance I'll try and get something implemented and post the details.