28 Apr
2013
28 Apr
'13
12:12 p.m.
I'm in the process of trying to resurrect a MicroVAX-II system.
I have a RRD50 cd reader and the associated KRQ50 controller. What I'm
missing is the cable between the cabinet kit and the drive.
I've tried various incantations, including a AUI cable (DA15 to DA15)
and what I think is a straight-through cable. I also hooked the cabinet
kit DA15M direct to the drive with no success.
A DA15 conenctor on a CD-ROM drive suggests the old Philips/LMS (Laster
Magnetic Stroage) interface. I have the service manual dfor one such
drive used o na PCB) whihch gives the interface pinout.
If that's right, the cambe would be straight-0through, but there are a
couple of differnetial (RS422-like) signals which probabvly should be
twisted pairs. But this doens;'t explain why the thing doesn;'t work
with the cab kit direlctly plugged into the drirve.
Are you sure the drive and controlelr are working properly? I think for
it to sping up at all, the thing must be focussing correctly, which
implies the laser diode is alight, but there could be a doxen problems
with the drive. Have you looekd at the RF Eye pattern, for example?
-tony