TD Systems TDL-11 QBUS (SCSI?) card
jnc at mercury.lcs.mit.edu
Mon May 4 07:38:31 CDT 2015
> From: Seth Morabito
> 1. Halt the CPU and enter ODT
I'm too lazy to check to confirm this, but I strongly suspect DMA requests
don't get serviced while the machine is halted. If so, you could use the
following code fragment to avoid that:
0400 12737 MOV #400, @#174400
777 BR .
Start at 0400, let it run for a couple of seconds, then halt the machine
and look at 01000 and up.
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