[Simh] IMP interfaces

[Phil Budne]

Timothe Litt wrote:
> KL10 - AN10 - I/O bus interface to the IMP for 1080/1090/1091

Drawings for the AN10:
http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp10/periph/MP00326_AN10_Arpanet_Interface_Engineering_Drawings_Jul77.pdf

> KS10 - AN22 (Yet another KMC11 + line card device)? This may have been a
> repackaged IMP11-B.

ISTR this was the supported interface for TOPS-20 on the KS10,
for NCP-era (pre-TCP) ARPAnet.