[HECnet] Re: native Dup sync line revisited --> revisited Dup test on pdp11 --> problem solved: Simh KG11 emulation probably defective

What I mentioned is one or several PDP-11 products, available for RSTS and I believe RSX. There definitely is an "RJ2780 emulator" -- the official name may not be quite that. And I think there was also a 3271 emulator, though I'm not sure if that existed on RSTS. I have no idea what these things do, since 2780 is something I've never used. Some sort of remote job entry station? Anyway, it is the only RSTS software that uses a KG11. DECnet doesn't because on RSTS DECnet only supported devices with hardware CRC: DMC and friends and later Ethernet.

I did an unsupported software DDCMP, but that does CRC in software (8 bits at a time, the classic table driven fast software implementation). That probably outruns a KG11 and in any case I never had access to that hardware.