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APOCALYPSE Sega System 18 Official Sales and Wait List

Hi,
could you tell me someone what difference is between these two Sega System 18 boards? One board is labelled 171-5873-02A (837-7177-02) and second revision is 171-5873B (837-7177). The 171-5873-02A has CN8 and and additional header CN9 while 171-5873B has only CN8 header. What is the CN9 header for and which board is older? Thanks.
 

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The 837-7177-02 is newer it also has the extra connector and en extra crystal. Could you share hi-res pictures of these PCBs please ?
 
Unfortunatelly I have no hi-res pictures. It is all what I have found on the Internet... The additional CN9 header should have something common with other controller or spinner?
 
Rabik said:
Unfortunatelly I have no hi-res pictures. It is all what I have found on the Internet... The additional CN9 header should have something common with other controller or spinner?
Click to expand...
Maybe it has, with a hi-res picture we might be able to find out where the traces go.

Maybe people here can check their System18 PCB to determin if they own a: 837-7177-02 ?
 
Rabik said:
Unfortunatelly I have no hi-res pictures. It is all what I have found on the Internet... The additional CN9 header should have something common with other controller or spinner?
Click to expand...
The black connector on the right edge (CN5?) accepts the same choice of I/O boards for trackballs or 3P/4P inputs, I believe. Same as System 16/24/32.
 
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