MicroVAX II - TK50 problem

[Adrian Graham]

> -----Original Message-----
> From: cctalk-bounces at classiccmp.org 
> [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Dan Williams
> Sent: 10 March 2005 18:48
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: MicroVAX II - TK50 problem
> 
> On Thu, 10 Mar 2005 11:05:19 -0700, willisjo at zianet.com 
> <willisjo at zianet.com> wrote:
> > The saga continues...
> > 
> > Got the system running finally, but now I can't get the TK50 tape 
> > drive to work. Have checked the cabling, reseated 
> everything, and even 
> > tried a different TQK50 controller. Have tried the 
> following from VMS 5.1:

the uVAX II has a Q22/Q22 backplane so the positioning of the TQK50 is
important, as is the RQDX(2/3) disk controller which should be last on the
bus. The first 3 slots are CD types and are reserved for CPU/Memory, the
rest (I can't remember which size cab you've got) are serpentine so if
you've only got the CPU, 2 mem boards and the disk/tape controllers then the
TQK50 should be on top of the RQDX3.
I notice 8 TX lines which means there's a quad-height DHV11 there, probably
next to the memory. If you've got a DEQNA ethernet half-height board as well
then that'll mean you have TQK50/DEQNA occupying a quad-height slot and the
RQDX3 on its own in the AB side of the slot next to that.

Google for 'vax q22/q22 backplane' and you'll find an excellent explanation
of how the uvax backplane works.

cheers

a/w