you will also need to either reverse engineer the
custom microcode
or find a document that describes what the added instructions do.
The opcodes and a short description of all of the E/F microcoded
instructions appears starting on pages 11-22 of the M/E/F CE handbook
5950-3767_M-E-F_CEhbk_Jul84.pdf
At least it gives you the opcodes they used. You'll still have to
figure out from the code what they actually do.