The Ampro Little Board was a very simple and cheap Z80-based computer from 1984, which ran CP/M. It was, in fact, a single PCB which you could mount on the bottom of a 5.25" drive.
All about the Ampro Little Board
It stored either 400kB on a double-sided 40-track drive or 800kB on a double-sided 80 track drive. The disk format it used was a slightly quirky variation of the standard MFM IBM scheme --- sector numbering starts at 17 rather than 1 (or Acorn's 0). FluxEngine supports this.
Just do:
.obj/fe-readampro
You should end up with an ampro.img which is 409600 or 819200 bytes long.
You can pass this straight into cpmtools:
$ cpmls -f ampdsdd ampro.img
0:
-a60014.e
amprodsk.com
bitchk.doc
bitchk.mac
cpmmac.mac
dir.com
himem.doc
himem.mac
kaydiag.lbr
kayinfo.lbr
...etc...