12 Jun
2026
12 Jun
'26
8:01 p.m.
The RLV12 (RL02 drive controller) in my PDP-11/23+ has decided to quit
working when it gets hot in the room.
RT-11 won't boot, with an ERR 15 Controller Error.
The defect may have become permanent, will have to check in the morning
when everything's cool.
The drives themselves are not indicating any faults, and both of them
exhibit the same behavior on boot.
Trying to rig up an emulator (or boot XXDP from the Teac 3.5" floppy)
introduces a whole new set of hair-pullers.
Since the RLV12 is so complex, I am tempted just to replace it, if one
can be had... so does anyone have one they don't need? :)
thanks
Charles
12 Jun
12 Jun
9:58 p.m.
Hi Charles,
I have a list of things to look for this weekend and I'll put it on my
list. I should have at least one left.
Thanks, Paul
On Fri, Jun 12, 2026 at 10:13 PM Charles Morris via cctalk <
cctalk(a)classiccmp.org> wrote:
The RLV12 (RL02 drive controller) in my PDP-11/23+ has
decided to quit
working when it gets hot in the room.
RT-11 won't boot, with an ERR 15 Controller Error.
The defect may have become permanent, will have to check in the morning
when everything's cool.
The drives themselves are not indicating any faults, and both of them
exhibit the same behavior on boot.
Trying to rig up an emulator (or boot XXDP from the Teac 3.5" floppy)
introduces a whole new set of hair-pullers.
Since the RLV12 is so complex, I am tempted just to replace it, if one
can be had... so does anyone have one they don't need? :)
thanks
Charles
13 Jun
13 Jun
12:41 a.m.
I would take this as a hint to check / replace the fans, improve the airflow, and perhaps
provide chilled air.
It could be worse at least you get an error message from the finest MSI and Am2911 bit
slice controller
Martin
-----Original Message-----
From: Charles Morris via cctalk [mailto:cctalk@classiccmp.org]
Sent: 13 June 2026 03:02
To: cctalk digest <cctalk(a)classiccmp.org>
Cc: Charles Morris <charlesmorris800(a)protonmail.com>
Subject: [cctalk] Looking for RLV12 card (DEC M8061)
The RLV12 (RL02 drive controller) in my PDP-11/23+ has decided to quit working when it
gets hot in the room.
RT-11 won't boot, with an ERR 15 Controller Error.
The defect may have become permanent, will have to check in the morning when
everything's cool.
The drives themselves are not indicating any faults, and both of them exhibit the same
behavior on boot.
Trying to rig up an emulator (or boot XXDP from the Teac 3.5" floppy) introduces a
whole new set of hair-pullers.
Since the RLV12 is so complex, I am tempted just to replace it, if one can be had... so
does anyone have one they don't need? :) thanks Charles
4:57 a.m.
While you're waiting do try to get the diagnostics going. The TU58FS is
a handy thing to have in your back pocket and can make loading stuff
onto the system a *lot* easier.
As for the RLV21 (and the 18 bit RLV11) it's a combination of analog and
digital things so there are a number of things that can go bad. The
diagnostics should tell you what works and what doesn't, then you can
consider a board level repair.
C
On 6/12/26 23:01, Charles Morris via cctalk wrote:
The RLV12 (RL02 drive controller) in my PDP-11/23+ has
decided to quit
working when it gets hot in the room.
RT-11 won't boot, with an ERR 15 Controller Error.
The defect may have become permanent, will have to check in the morning
when everything's cool.
The drives themselves are not indicating any faults, and both of them
exhibit the same behavior on boot.
Trying to rig up an emulator (or boot XXDP from the Teac 3.5" floppy)
introduces a whole new set of hair-pullers.
Since the RLV12 is so complex, I am tempted just to replace it, if one
can be had... so does anyone have one they don't need? :)
thanks
Charles
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days inactive
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3 comments
4 participants
participants (4)
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Charles Morris -
Chris Zach -
Martin Bishop -
Paul Anderson