PDP-11/45 RSTS/E boot problem

Jon Elson elson at pico-systems.com
Mon Feb 11 10:12:57 CST 2019

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.


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