I seem to recall that when the ribbon cable is in backwards, the fault light comes on.
Paul On Fri, Nov 22, 2019 at 7:55 PM Chris Zach via cctalk <cctalk@classiccmp.org> wrote: > Normally my answer would be "no". *However* there is mention that > changing 3 jumpers on an RL02 will allow you to read an RL01 pack (not > write). > > http://www.pdp-11.nl/peripherals/disk/rl-info.html > > So... Maybe. However right now I'm trying to get the disks up. It's been > 20 years, and my cables are not in the best of shape. One cable seems > totally dead, as the RL02 flunks when connected to the controller (DRIVE > 0 and FAULT always on). With the second cable all lights are off and the > drive spins up and goes ready, however as soon as I try to boot the > drive goes to FAULT. If I remove the 0 drive selector and put in a 1, > the fault goes out, however trying to boot DL1: gives the same error. > > This happens on both drives with two different boot packs (old RSXM38 > images). So it is either the cable (possible as two pins were bent and > needed to be straightened) or the controller (also a maybe, been 20 > years I might have another spare somewhere around here). I'll order some > DeOXit, ohm out the first cable to see if it's bad, and try again next > weekend. > > Never dull. On the positive side I saved at least one set of RL02 rails. > So there is that. > > C > > On 11/22/2019 2:36 PM, Al Kossow via cctalk wrote: > > > > > > On 11/22/19 11:16 AM, Chris Zach via cctalk wrote: > >> That > >> could be a problem if I want to re-load Cobol 81 onto this RSTS/E > system. > > > > weren't RL01s usable in an RL02? > > > > >