From: Greg 'groggy' Lehey
Interdata had instruction sets that were close to the
IBM instruction
set, but my recollection was that they were different enough that IBM
software wouldn't run on them.
Bitsavers doesn't have a wealth of Interdata documentation, but there is some:
http://bitsavers.org/pdf/interdata/32bit/
Someone who's familiar with the 360 instruction set should be able to look
at e.g.:
http://bitsavers.org/pdf/interdata/32bit/8-32/8-32_Brochure_1977.pdf
and see how compatible it is.
Noel