bob at jfcl.com
Fri Dec 26 22:04:56 CST 2008
>Dave McGuire wrote:
> I think 5MB is correct. And don't they use the same memory array
>boards as the PDP-11/70?
Yes, the 725/730 is limited to 5Mb, although it's tricky to find enough
slots for this if you've got any peripherals. I have a 11/730 that's
fortunate to also have the BA11-K UNIBUS expander box, so I've got room for
5Mb, but that was an unusual configuration.
The memory boards used in the 730 are the same as the 11/750 1Mb memory
My 11/730 runs, except for the R80 which needs a new HDA (alas, Rx80 HDAs
are pretty much unobtainium today), however it also has a UDA50 and two
RA81s, so there's plenty of disk space. I'm afraid I'm not much interested
in Un*x, but I'll ask my wife (who is the Un*x dweeb) if she's interested in
trying Quasijarus/BSD on it.
Is there a 9-track distribution? How do you install it? Normally you'd
install VMS from 9-track by booting S/A BACKUP from TU58 or an RL02 pack - I
assume there's some kind of stand alone mtboot program for Un*x, but what
media do you load that from?
I've also got a 11/725 that's in good shape except for a few missing
pieces of sheet metal, but like Ethan I've no working RC25 drive. A UNIBUS
SMD controller is an option - there are some small 8" SMD disks that mist
just fit inside the chassis in place of the RC25 - but a UNIBUS SCSI
controller would be a better way to go, since it'd be no problem to fit a
SCSI disk in there. Unfortunately neither SMD nor SCSI UNIBUS controllers
are easy to come by.
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