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MicroVax II

MicroVax II

(OP)
Yeah I know---old as dirt. Worked on one today that hung, replaced the hard drive, and when I tried booting ("b" or "boot dua0"), it reported that it was offline. After messing with cables and line cards, I removed the external disk and the M7513 card it was hooked to (plugged the backplane directly into the M7555 disk controller), and it booted just fine. Anyone else see one of those external deals hang a Q-bus?

Burt

RE: MicroVax II

Hello,

could you describe what is a M7513 card ?

And I never saw anyone plugging a backplane into a disk controller. Ususally one plugs a disk controller into a Qbus backplane. Perhaps could you explain ?

It seems your disk controller and the M7513 card had the same adresse or interrupt vector, which you must avoid.

Another possibility is a hardware failure with the external disk or disk extension.

And if I remember well you have to configure the RDxx disks adresses 0 or 1 with jumpers located on the disks.

Pierre

RE: MicroVax II

(OP)
'twas a long day, my friend...


And I never saw anyone plugging a backplane into a disk controller. Ususally one plugs a disk controller into a Qbus backplane. Perhaps could you explain ?

Got that backwards.
I think the M7513 was used for an external disk...

Burt

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