PDP-11 disk image question

Warner Losh imp at bsdimp.com
Mon Feb 18 21:29:59 CST 2019

On Mon, Feb 18, 2019 at 6:18 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.

The RX50 was a single sided 800 block floppy. The first two tracks had no
interleave. The rest has 2:1 interleave, though sometimes physical and
other times logical. Strange in some ways, kinda standard in others. But
it's still a floppy, and other than size, much like the RX33 with 1/3 the
number of blocks.


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