Microvax II hardware not recognized

Douglas Taylor dj.taylor4 at comcast.net
Fri Aug 19 12:36:28 CDT 2016

On 8/19/2016 6:04 AM, Peter Coghlan wrote:
> [snip]
>> Device                  Device           Error
>>   Name                   Status           Count
>> MPA0:                   Offline              0
>> PTA0:                   Online               1
>> PUA0:                   Online               1
>> PUB0:                   Online               1
>> I swear that when I first installed VMS the DHV11 ports showed up in 
>> the show dev list on the MicroVax II.
>> The TQK50 controller (I have 2) were put into a MicroVax 4000 and 
>> that Vax saw each board, so I don't think the boards are bad.
> It's not clear to me what issue you are reporting regarding the TQK50
> controllers.  Are you saying that VMS is not seeing them because you 
> don't
> see any MUA devices listed?
> PUA0 and PUB0 are your two disk controllers.  Some googling suggests 
> that PTA0
> is a tape controller.  (Google also suggests that one error at startup 
> is to
> be expected for PT/PU devices.)
> Having PTA0 listed suggests that VMS is seeing the tape controller but 
> not
> seeing any actual tape drives attached to the controller.  Maybe the tape
> drive or drives are not correctly attached to the controller or are not
> powered?
> (Don't worry about MPA0 - this is a virtual device expected to be absent
> in VMS V5.5-2 and present in VMS V7.2.  It is not related to tape or 
> serial
> controllers.)
> Regards,
> Peter Coghlan.

I removed the DHV11 and checked the switch settings and they are all set 
to the factory default.

This DHV11 was put into the MV4000 backpland and VMS 7.2 booted. Show 
Device lists  TXA0: thru TXA7.

The MicroVax II is about 30 years old, should I suspect the backplane?  
How do you clean it?  Should I try another CPU card?


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