I researched more. I now learned that LaserWriter II series use Canon SX engine. It is compatible with CX engine that I think so. LaserJet II and III are based on SX engine. LX engine is for personal laser printers like LaserWriter NT, LaserJet IIP and IIIP. LX/SX engine uses 68000...
Yeah. You are right. I read Wikipedia and it said that HP LaserJet is based on Canon LBP-CX engine.
I noticed that current MAME (/src/mame/apple/lwriter.cpp) still show skeleton flag. Are you trying to get it working?
Ok, I now found this forum because I am new to this. I was searching for LaserWriter ROM dumps, etc. because they are based on HP LaserJet laser printers. Is that possible to make ROM dumps from HP LaserJet laser printers also? HP LaserJet printers use 68000 processor too.