so now I get [:fdc] command read data mfm cmd=46 sel=0 chrn=(0, 0, 1, 256) eot=10 gpl=36 dtl=ff rate=5000
R. Belmont: and nothing else happens, apparently. hangs forever waiting on bit 6 of port 0xF9
Hmmm ... you probably thought of all that yourself ...
... did you try both ROM sets from my machines as they were physically dumped as opposed to read out by BASIC
... the disk manual states the boot priority:
a. If a module is inserted, it's loaded when the PC is switched on or reset.
b. If there is no module, but a ready disk station, the disk is loaded. If there is no disk inserted, the system waits for the correct insertion of a disk.
c. If neither a. nor b. are true, the system loads the internal BASIC interpreter.
... Bit 0 of IN 10H tells you if a Floppy unit is available (=1) or not ...