Who changed the gravitational constant (Dec pdp11 stuff)

Paul Anderson useddec at gmail.com
Sat Nov 23 02:41:45 CST 2019

I seem to recall that when the ribbon cable is in backwards, the fault
light comes on.


On Fri, Nov 22, 2019 at 7:55 PM Chris Zach via cctalk <cctalk at classiccmp.org>

> 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?
> >
> >

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