LaserWriter II NT

I am writing an emulator for this board in order to support Localtalk for the MAME. The information on Internet reveals enough to get started and I also got hold of a romset. The whole CPU power is located on what they consider an I/O board but it really does all the rendering of Postscript and emulation of the old Diablo 630 daisy wheel protocol.

I found some pictures here that I stitched together:

As can be seen there was a few areas missing at the bottom of the PCB but it is really helpful when trying to trace board. Unfortunately the board is one of the first revs using a TPI6523 while the romset has been proven to use the newer VIA6522 chip, the same as used in the Commodore 64 btw :)

Obviously the pcb has more than two layers as the connectors to the left, unfortunately not pictures as the front panel covered that part of the pcb, has no visible traces and there are in-penetrable areas of copper on both sides in that area