11 Feb
2019
11 Feb
'19
8:12 a.m.
On 02/11/2019 07:04 AM, Noel Chiappa via cctalk wrote:
A look at the RK11 registers after the swap-out showed
an anomaly; something
about the extended memory address bits? (Maybe a multi-block transfer than
crosses a 64KB boundary? That would explain the address sensitivity we were
seeing.) Hopefully he'll track it to its lair shortly.
OH, BOY! I think you may have found it. Likely some disk
controllers did NOT SUPPORT crossing 64K boundaries! The
diags would not detect that, as it was likely expected
behavior. I would suspect the driver would need to break up
these operations.
Jon