Re: KA410 Boot Failure With TKZ-50

[Johnny Billquist <bqt%update.uu.se@localhost>]

On 2020-06-14 19:02, Rhialto wrote:
> Sorry if I am confusin things here, but...
>
> On Sat 13 Jun 2020 at 22:15:32 -0400, Thor Lancelot Simon wrote:
> > The TK50 hardware implemented neither TMSCP nor SCSI.  It implemented a
> > very minimal proprietary protocol over a very, very slow serial connection
> > (200Kbit/sec) to one of two possible controller cards: the SCSI TKZ50 or
> > the QBus TQK50.  An 80186 (I think; might have been an 8085) on the
> > controller card interfaced to one of the two possible host buses.
>
> I have (packed away) a TK-50 drive and a TKZ-50 drive. I also have a
> uVAX 2000 (KA410) and a uVAX 3100 (and also a VAXstation 3100). One type
> of drive came with the one VAX, and the other with the other.
>
> In my recollection, which may of course be off, it was the TK-50 (not
> SCSI, but cabling etc looks the same) that came with the 2000, and the
> TKZ-50 (SCSI) came with the 3100.
>
> So perhaps $SUBJECT occurs because it is the wrong type of tape drive?

No, I'm pretty sure the TKZ-50 was explicitly made for the uVAX2000. 
That machine only have an MFM interface for disks, and a SCSI 
controller, who's only purpose was to connect to the tape drive. There 
were nothing else in it.

Also, the form factor of the TKZ-50 case is identical to the uVAX2000, 
and they were stacked on top of each other, if I remember right.

  Johnny

--
Johnny Billquist                  || "I'm on a bus
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