I'll go along with that. It was/is a very
well-desinged interface. At a
high level it looks remarkably like HPIB/IEEE488 (to the extent that
there's an HP interface -- the 82169 IIRC -- that transparently links
HPIB devices to an HPIL controller or HPIL devices to an HPIB
controller). The low level (I have the specs somewhere) is pretty simple
as well...
Why does a multimeter need a data bus?