11 Jan
2019
11 Jan
'19
11:32 a.m.
From: Allison Parent
Most Probable cause is interrupt grant is broken.
The only -11 that complains if the grant chain is broken that I know of is
the /34 (maybe the /04 too). I certainly have a QBUS chassis right next to my
workstation here that i) has a bunch of empty slots, and ii) works fine, as
long as there are no empty slots between the CPU and the devices.
Also, IIRC he said it works with 3 cards plugged in, but not 4; how can
plugging a card _in_ cause grant problems?
For most microspheres backplanes the first three slots
are different
than remaining.
That might be worth checking into. I'm not familiar with the second box
he's using, so can't help there.
Noel