11 Mar
2004
11 Mar
'04
10:49 a.m.
"R. D. Davis" wrote:
After attaching an external power supply to my TK70
(since I don't
have the sled with connectors to the VAX's power supply, and didn't
know where to solder power cables to from inside the empty bay), and
installing the TQK70 into a Qbus slot, I can't get the system to even
recognize the TQK70. Nothing lights up on thee TK70, although both
LEDs on the TQK70 are lit. The cable is connected the right way.
The CSR on the TQK70 is set to 774500, and the jumpers are connecting
the bottom two of the three rows of pins on the drive-select jumpers.
I've tried inserting the TQK70 into various slots (including upper and
lower, since I understand that grant continuation follows a serpentine
pattern.
When I do a show qbus command, the TQK70 doesn't show up:
Jerome Fine replies:
I had a similar problem with both the TK50 and a TK70
drives on a PDP-11/83 system. Initially, I also used an
external power supply. After I switched back to the
internal power supply, everything worked correctly.
It should not be too difficult to take a tap off the power
for a hard drive and split it for the TK70. I suggest you
try that next. For some reason, the TK70 is especially
sensitive to where the power is coming from.
I power all of my disk drives on the PDP-11/83 from
external (PC) power supplies and NEVER have a problem,
so I did not anticipate a problem with the TK70 drive.
Using the internal power from the VAX may solve your
problem.
Please let us know if it does!!
Sincerely yours,
Jerome Fine
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