This might be my only system on hand with prototype ROMs. So I can not tell if this are in the correct order. I assume they are, but the machine powers up and does nothing. Before I re-cap, I want to make sure these are correct.

My only guess is:

LL - low low

ML - middle low

MH - middle high

HH - high high

Other than those identifiers, there are no differences externally. By the way, I did clean the board since to wash off any cap goo, etc. And I have tried good power supplies. Odds are I need a re-cap.