Anyone out there have any information or documents related to defining new microcoded instructions for the Symbolics 36xx series of machines?  I've been fooling around with my 3630 and I thought it'd be a fun experiment to try to create an instruction or two, since I've never had opportunity to work with a microcoded system before. Unfortunately I haven't been able to find any information at all about the details of the available micro-ops or the format of the microcode files loaded by the FEP.

 

Any information would be appreciated,

 

Thanks!

Josh