[HECnet] Download a PDP-11 w/o Ethernet?

[Paul_Koning at Dell.com]

Others already answered the boot ROM part.   As for the protocol, MOP arrived first on DDCMP, and yes, that includes load/dump.   If anything, it's primarily load/dump.   The Sysid stuff is specific to Ethernet.   I think DDCMP MOP also has MOP level loopback, using MOP packets which are different from the 90-00 Ethernet loop protocol.

In DDCMP, MOP is a mode ("maintenance mode") -- same basic frame format but it's a datagram service as opposed to a connection oriented service.           It's all spelled out in the specs ("maintop" which is MOP, and the DDCMP spec).

paul

On Feb 4, 2013, at 5:49 PM, Bob Armstrong wrote:

An off the wall question that I   m sure somebody on HECnet will know     was it ever possible to download a boot image (e.g. RSX-11S) to a PDP11 over a DDCMP serial interface (e.g. a DUP/DMR/DMC or whatever)?   Kind of like doing MOP over Ethernet, but without the Ethernet.

Thanks,
Bob