On Jun  3,  9:18pm, Michael L. Hitch wrote:
> On Jun  4, 11:46am, Toru Nishimura wrote:
> > Hi, all.
> > 
> > > The PMAZ-A card gets it clock from the TurboChannel clock.  [I've
> > > measured the clock input on the 53C94 on several different
> > > configurations to verify the 53C94 clock configuration was getting set
> > > correctly.] 
> > 
> > Ok, I see.  The question now is how reliably PMAZ-A can run at 25MHz
> > NCR53C94 chip clock rate (in driver's sense) attached with 3MIN and
> > MAXINE.  I will wait for field reports. 
...
>   The timing could also be checked by seeing how long the device
> probes take for the PMAZ-A card with no devices.

  And here it is - the first one with the current configuration of 12.5Mhz,
and the second one forcing the PMAZ-A driver to configure as a 25Mhz clock.
Note that it does indeed take twice as long to probe the devices.  The
times also match what I would expect:  250ms * 2 probes * 7 devices =
3.5 seconds.


----------------------------------------------------------------------------
Copyright (c) 1996, 1997, 1998
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 1.3E (ASCNEW) #980530-5: Mon Jun  1 00:22:26 MDT 1998
    mhitch@:/usr/src/sys/arch/pmax/compile/ASCNEW
Personal DECstation 5000/25 (MAX\^A
...
ascnew0 at ioasic0 offset 0x300000 priority 3: NCR53C94, 25MHz, SCSI ID 7
...
ascnew1 at tc0 slot 1 offset 0x0: NCR53C94, 12MHz, SCSI ID 7
...
# time ./scsireprobe /dev/rsd0c:1:-1:-1
reprobing /dev/rsd0c:1:-1:-1
        3.67 real         0.04 user         3.36 sys

----------------------------------------------------------------------------
Copyright (c) 1996, 1997, 1998
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 1.3E (ASCNEW) #980530-6: Wed Jun  3 21:31:09 MDT 1998
    mhitch@thunder.msu.montana.edu:/usr/src/sys/arch/pmax/compile/ASCNEW
Personal DECstation 5000/25 (MAX\^A
...
ascnew0 at ioasic0 offset 0x300000 priority 3: NCR53C94, 25MHz, SCSI ID 7
...
ascnew1 at tc0 slot 1 offset 0x0: NCR53C94, 25MHz, SCSI ID 7
...
# time ./scsireprobe /dev/rsd0c:1:-1:-1
reprobing /dev/rsd0c:1:-1:-1
        7.07 real         0.04 user         6.73 sys

----------------------------------------------------------------------------

Michael

-- 
Michael L. Hitch			mhitch@montana.edu
Computer Consultant
Information Technology Center
Montana State University	Bozeman, MT	USA