Ghosts 'n Goblins pinout - What is (d5) and (d4)? Pinout page in museum wrong!

Tighe

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Ghosts 'n Goblins pinout - What is (d5) and (d4)? Pinout page in museum wrong!

First I wanted to say that this is a bootleg GnG with the same Capcom classic pinout.

I made an adapter using one of those nifty Jammaboards.com fingerboards. In the pinout in the museum pin U and 17 are labeled (d5) and (d4) respectively. What are they??

Also I found that if I connected JAMMA ground to the coin counter ground it would blow the fuse on my power supply. It might be possible that pin is labeled wrong, or that the bootleg is different. I just disconnected it and replaced the fuse and it works fine.

Update:
I just looked at the PDF in the museum, and it is different than the pinout, some one should correct this, 22 and Z are labeled +12V Common in the PDF and counter ground on the pinout page!!

Pinout page:
http://www.arcade-museum.com/pinouts-game/7938.html

PDF manual scan:
http://www.arcade-museum.com/manuals-videogames/G/Ghosts n Goblins misc.pdf
 
Anyone know what d5 and d4 are?

Yup. But I'm afraid the answer isn't very exciting...

The pinout appears to have originated from the Capcom schematics (see first attached image).

d4 and d5 refer to "data bit 4" and 5, which is reference to the way the coin and start buttons are read by the CPU (see second attached image). d6 and d7 are coin 1 and coin 2, d0 and d1 are start 1 and start 2. d4 and d5 are apparently connected to the edge connector, and available for the game code to read, but don't seem to have any named purpose.

However, the mame driver (http://mamedev.org/source/src/mame/drivers/gng.c.html) implies that d5 is a service credit input:

Code:
   78  static INPUT_PORTS_START( gng )
   79      PORT_START("SYSTEM")
   80      PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_START1 )
   81      PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_START2 )
   82      PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNKNOWN )
   83      PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN )
   84      PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN )
   85      PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_SERVICE1 )
   86      PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_COIN1 )
   87      PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_COIN2 )
 

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