2 Mar
2014
2 Mar
'14
9:39 p.m.
3) On the processor card, under the SCSI/HP-IB port,
there's a 50pin=0A=
connector, which looks like a SCSI-50. Can I connect there a standard=0A=
SCSI disk?=0A=
=0A=
If it does not say SCSI=A0 Don't hook anything SCSI to it.=A0 There Com boa=
rd uses the=0A=
same Connection and if you connect=A0 a SCSI=A0 Device=A0 you will see smok=
e and lots of=0A=
not good things will happen.=A0 I=A0 Know first hand.=A0 Many years ago whe=
n these where =0A=
like gold,. I took one apart to clean it up.=A0 Putting it back together I =
hook the SCSI =0A=
cable to the wrong connector,=A0 I believe it was $1500.00 mistake=0A=
YEs, HP used the 50 pin microribbon connector (liek a SCSI-1 connector)
for the RS232/RS422 port some HP9000s (certainly HP9000/200 machines) and
temrinals. The sstem power lines (+5V, +12V, -12V) are also on that
connector, which is useful (a)( as testpoints for them and (b) as a
powersurce for interface converfters such as current loop).
Therefore conenctign a SCSI device to that connector generally lets majic
smoke out of the SCSI device. I am not sure if power lines get shorted
together ro to ground (they may well do), an HP PSU should stand that, but..
Incidentally, on the HP900/200 DIO cards this 50 pin microribbon
conenctor is sued both for the RS232 port and for the GPIO (no, I do not
mean GPIB) 16 pin parallel I/O port. The difference is that the RS232
conenctor has spring clip latches to hold the plug in, the GPIO one has
screw-down jackposts. But I would have expected better from HP!
-tony