Thanks for the manuals. TRB286IN.TD0 is a valid CP/M disk and contains TURBOW.COM and TURBOW.CMD.
Unfortunately, 6 other images appear to be broken when i try to mount them under DOS 3.10 ("bad unit error reading drive B"):
X RBADAPKT.TD0 : crashes with "FATALERROR: Incorrect layout on track 0 head 0, expected_size=50000, current_size=88368 "
(TD0 format violation?)
From my experience, it is better to read old disks on the original RX50 drive with the help of Jeff's RBIMG. This results in a plain sector image (no error info, though).
PC-HD drives tend to find errors on disks that are perfectly readable on a well-maintained RX50.On another note: the CPU-ID program on RBDS31UT.IMD claims we "incorrectly allow interrupts after a change to SS" (see screenshot).
Old 8088 CPUs (before 1981) had this bug. Is that behaviour wanted / correct?
Assembler source from CPU ID 1.42
Hunt for FLG_CERR to find the code to exhibit the bug.