PDP-11 disk image question

Paul Koning paulkoning at comcast.net
Mon Feb 18 20:02:21 CST 2019

> On Feb 18, 2019, at 8:18 PM, Bill Gunshannon via cctalk <cctalk at classiccmp.org> wrote:
> On 2/18/19 7:39 PM, Paul Koning wrote:
>> ...
>> TU58, no -- that's not a file structured device on RSTS.  RX33 is an RX50 in a different physical package if I remember -- 800 block MSCP device.  That works fine, subject to the necessary tricks to get the files on the floppies and do the switching.
> No, RX50 was a strange DEC format.  RX33 is a 1.2M floppy.

Ok.  That's may be big enough without volume switching, but in any case, if it speaks MSCP, RSTS will support it.  (Well -- more precisely, if it speaks MSCP and have fewer than 2^23 blocks.)

>> ...
>> You mean build an initial system on a small disk, and then load the rest onto a big disk some other way?  Sure, that should work fine.
> I was thinking build a minimal system on a smaller disk and
> and then use it and backup to move the RA81 system to real
> hardware and then use that for playing with.

Yes, that will be fine.  If the disk is RL02-ish in size it will be ample for this purpose.  Even something as small as an RK05 can probably be  made to do a basic job.


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