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Re: netbsd on vax 11/730; booting in sim

Anders Magnusson wrote:
Johnny Billquist wrote:
Anders Magnusson wrote:
Brad Parker wrote:
Anders Magnusson wrote:
Hehe, interesting :-)

I might put the dust off an old 11/750 with an RP07 disk and see if
it works with 5.0... :-)
>From what I saw the 750 support should work fine.  Only the 730 code
missing.  Certainly with 2.0.3.  I have not tried anything more recent,
but I will.

mmm.  an RP07.  Have you spun it up recently?

About a year since last time.  I also have a RP06, but the disk formatter
has some problem and I haven't fixed it yet. Usually connected to a
DEC 2020 :-)
Formatter as in software? Just whip some together. The documantation is
available. Or drop by Uppsala and we could format the pack on our 11/70.

No, the hardware.  Hm, I think formatter is the corresponding word on
tape drives.  Gee, I haven't used these words in so long time so I
may even use the wrong words :-)

There is no proper corresponding hardware to the tape formatter for a disk. But I suspect you might be meaning the massbus adapter. :-) The TM03 tape formatter for instance talks on the massbus, and then talks unformatted Pertec to up to 8 tape transports (for a total max of 64 tape drives on one massbus channel).

The RP06 massbus adapter is just adapting the massbus signals for the RP06 drive (actually a Memorex drive with a few cards modified by DEC). No real intelligence in there.

The RP07 should not be able to connect to 11/750 due to the high Massbus
data rate, but I have never encountered any problem.
The RP07 can be set to two different transfer speeds. It's a jumper
configuration in the drive, and it just changes the data transfer speed.
If it's set to the lower speed an 11/750 should probably be fine. Don't
know if it was officially supported though.

It wasn't.  I assume that even with the lower speed (1300KB/s) so could
it be too high if multiple disks were connected, or something.  RM80 was
supported though (1200KB/s).

Sounds likely.


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