[LMH]Raven Microcode Questions

[Nyef]

Hello all.

Over the past couple weeks I've been working on figuring out how the 
Raven (Explorer I) processor interprets it's microcode. I've got some of 
it figured out, but I have a few questions.

I'm figuring that the condition field of the jump instruction 
selectively disables the main jump action, in favor of the abbrev-jump 
field action (if specified).

My first question is how do the condition and abbrev-jump fields 
interact on alu and byte instructions? How does the condition field 
operate on these instructions without the abbrev-jump field?

My second question is what is the encoding for where to store the data 
when using the jump instruction to read I-Memory?

I'm sure there are more questions waiting in the wings. Oh well.

If someone could shed some light on these subjects it would be much 
appreciated.

--Alastair