Now have the 80186 co-processor running in the Master 512 (bbcm512). Had this working a couple of weeks ago but been having trouble with floppy formats to get GEM loading.
The machine is not yet complete as it still needs a mouse device. It's supposed to be capable of reading various PC floppy formats and running some PC software so will try hooking up the ibm5150 software list to check compatibility.
The issue with floppy formats was due to a subtle bug in the wd177x_dsk helper. The number of sectors per track is fixed to that of the first image loaded, and could be the cause of other MT issues reported that use this helper. Need to get this stuff cleaned up and submitted in the next couple of days.
I've been using READ8_DELEGATE instead of read8_delegate(FUNC, which is preferred?