9 Jun
2002
9 Jun
'02
9:48 a.m.
Bob Lafleur wrote:
I've got 50-pin SCSI-2 connectors inside my
MicroVAX 3100. Is there a
way to use 68-pin devices? The RZ26L and RZ28's in it are 50-pin, but I
have some RZ29's that are 68-pin and I'm wondering if there is in
adapter? I suspect not, but just asking.
Jerome Fine replies:
I can't help you with the RZ29. I use only the RZ28.
If I'm not mistaken, it is possible to "go
the other way" and use 50-pin
devices on a 68-pin cable with an adapter that terminates that "extra"
lines, correct?
I normally get my RZ28 drives by opening an RZ28D-VA
box. If you can use them, they convert the RZ28 (which
is just an ST32550N drive from Seagate) into the 68 pin
interface. I can use a few more, so contact me off list if
you want to arrange for me to buy some RZ28D-VA
boxes which contain the ST32550N drives. Normally,
I buy about 10 at a time. They are quite useful to run
RT-11 when attached to a host adapter either on a PC
(PCI Adaptec AHA-2940AU) or on a real PDP-11
(Qbus CQD 220/TM). Each RZ28 can hold almost
31 RT-11 partitions. Under Ersatz-11 on a PC, each
ST32550N drive can have its own device driver under
RT-11 EVEN though it is connected to the same SCSI
host adapter.
Sincerely yours,
Jerome Fine
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