Some progress with my PDP-11/73 system
ajp166 at bellatlantic.net
Tue Apr 10 10:31:30 CDT 2007
>Subject: Re: Some progress with my PDP-11/73 system
> From: David Betz <dbetz at xlisper.com>
> Date: Tue, 10 Apr 2007 08:58:01 -0400
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>>> I soldered it back together but both drives still fail. At least
>>> one of the drives spins up but then back down again.
>> That can happen if the heads are stuck against the end stop inside
>> the drive. There's a rubber bumper that goes sticky. Alison
>> posted more information about that just a few days ago.
>Yes, I saw those messages. At this point I'm not up for opening up
>the drive to attempt a fix though. I guess if one of my good ones
>stops working I may change my mind. Instead, I'm starting to look
>into what is necessary for a minimal RT-11 bootable RX50 diskette.
>Unfortunately, that's the only medium I have for moving things to the
>hard drive on the PDP-11.
To boot a floppy under RT-11 is fairly easy. You will need a bootable
disk, That is a copy of RT-11 with the bootdevice you plan to use configured.
It also must have the hard disk driver as well and basic utilities. RT-11
fits on small devices (even tu58 256kB).
FYI: an option is to use TU-58 emulator on a PC and a serial line to
a PDP-11 as a fairly straight forward way to get stuff on a an -11
with blank media. At the extreme the DD boot can be hand entered
into uODT as its something like 30 words long. I know I used to boot
a romless 11/23 that way.
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