How to add a 2nd TK50?

[Bill Wyatt]

I've been trying to add a second TK50 to my system. What I'm planning
is really to add a 3rd party digital video tape drives to my system
(uVax II/GPX, Ultrix 2.0), but until I have that hardware, I decided
to test the configuration with a second TK. The problem is, I can't
seem to get it right.  The controller (TK or digital video tape) looks
like a TMSCP device, but I don't know how to configure it into the
system. There seems to be zero documentation on this question. 

Question: How do you add a second TMSCP device?

I tried the following configs (standard lines deleted):

  adapter	klesiu0	at uba0
  controller	tmscp0	at klesiu0 csr 0174500		vector tmscpintr
  tape		tms0	at tmscp0 drive 0
  adapter	klesiu1 at uba0
  controller	tmscp1  at klesiu1 csr 0160404		vector tmscpintr
  tape		tms1	at tmscp1 drive 1

and a variation:

  adapter	klesiu0	at uba0
  controller	tmscp0	at klesiu0 csr 0174500		vector tmscpintr
  tape		tms0	at tmscp0 drive 0
  controller	tmscp1  at klesiu0 csr 0160404		vector tmscpintr
  tape		tms1	at tmscp1 drive 1

These kernels both seem to compile correctly, and to configure
correctly at boot probe time. I then made and tried various devices
(tms1, tms4, tms5). Opening the tms[45] devices simply fails, saying
the device is nonexistent. Opening the tms1 device causes a machine
panic (except once, when it read the tms0 device!). 

HELP!
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