On this page one can find the images for the ST-506 emulator from David Gesswein
( https://www.pdp8online.com/mfm/)
suitable for an Acorn Archimeds A4xx or an ST506 podule card
Revision board : D
MFM version : 4.33
OS Version : Debian 11.8 (bullseye)
RISC-OS version : 3.10
Legal disclaimer:
Usage of the imsages is on your own risc