PDP-11: Disk over Serial proposal (fwd)

Tim Shoppa shoppa at alph02.triumf.ca
Sat Dec 6 02:53:53 AEST 1997

> Ok, it would be nice to have a way of installing Unix onto a PDP-11 without a
> tape drive. Here's a proposal: please comment on it (i.e shoot it down!). I
> actually wrote a very similar system to move files off my Apple ][ once.
> The PDP-11 is connected serially to another computer, using a DL11 port. The
> other computer will simulate one or more disk drives which are acessible by
> commands sent over the serial line.
> [Protocol description]
> Do we need a more sophisticated protocol with checksums, multiple outstanding
> commands, acknowledgments, framing bytes etc.?

Your proposal sounds very similar to the existing protocol (RSP) used
to access remote block-addressable devices (TU58's) over a DL11 port.
Why not just choose the RSP protocol?  It has the advantages of already
being defined and it already has support in most DEC OS's.  It could
be easily extended to support larger devices.  And RSP-servers
already exist for BSD-ish systems - see, for example, 


Tim. (shoppa at triumf.ca)

Received: (from major at localhost)
	by minnie.cs.adfa.oz.au (8.8.5/8.8.5) id PAA19692
	for pups-liszt; Sun, 7 Dec 1997 15:15:38 +1100 (EST)
X-Authentication-Warning: minnie.cs.adfa.oz.au: major set sender to owner-pups at minnie.cs.adfa.oz.au using -f

More information about the TUHS mailing list