andynumbers
Professional
I took a look at a bunch of my boards from the early to mid 90s era. I compared each edge to a high-quality JAMMA adapter board that has correct 3.96mm spacing.
It seems that there are mixed results. I wondered at first if manufacturers switched to the 3.96mm pinout when 4mm edge connectors became obsolete, but then I noticed that some early boards were also using 3.96mm. I think at the end of the day, the mahjong pinout standard is a mess, and each individual PCB needs to be checked for edge connector pitch, and how sound is wired.
Here are my findings:
Seta: Always 4mm. Tested SSV mahjong adapter from Super Real Mahjong PIV, Super Real Mahjong PV, Aleck 64 mahjong adapter
Taito F2 Mahjong Quest: 4mm (Taito didn't make any other mahjong boards though.)
Video system: old boards are 4mm. New boards are 3.96mm. Old boards include Mahjong Daiyogen, Mahjong Fun Club and others on this generation. New boards include Final Romance 2 and 4.
Jaleco Mega System 32 mahjong adapter is 3.96mm
Capcom z80 hardware is 3.96mm (Mahjong Gakuen, Poker Ladies, Block Block)
Nichibutsu boards are 3.96mm (Tested Tokyo Gal Zukan)
Update: I own Taisen Hot Gimmick now and can confirm Psikyo boards are 3.96mm pitch.
Since it's about 50/50 with the pinouts, I think it would be worth creating a 4mm version of a JAMMA adapter...if 4mm edge connectors can still be sourced. But I don't think it would be a good idea to clean out Beep shop's only inventory of remaining 4mm edge connectors. At the end of the day, when you use an adapter, check to make sure the pins are lined up as best as possible. It is better to have the power pins making full contact while the signal pins can be left hanging off by the 1mm difference.
It seems that there are mixed results. I wondered at first if manufacturers switched to the 3.96mm pinout when 4mm edge connectors became obsolete, but then I noticed that some early boards were also using 3.96mm. I think at the end of the day, the mahjong pinout standard is a mess, and each individual PCB needs to be checked for edge connector pitch, and how sound is wired.
Here are my findings:
Seta: Always 4mm. Tested SSV mahjong adapter from Super Real Mahjong PIV, Super Real Mahjong PV, Aleck 64 mahjong adapter
Taito F2 Mahjong Quest: 4mm (Taito didn't make any other mahjong boards though.)
Video system: old boards are 4mm. New boards are 3.96mm. Old boards include Mahjong Daiyogen, Mahjong Fun Club and others on this generation. New boards include Final Romance 2 and 4.
Jaleco Mega System 32 mahjong adapter is 3.96mm
Capcom z80 hardware is 3.96mm (Mahjong Gakuen, Poker Ladies, Block Block)
Nichibutsu boards are 3.96mm (Tested Tokyo Gal Zukan)
Update: I own Taisen Hot Gimmick now and can confirm Psikyo boards are 3.96mm pitch.
Since it's about 50/50 with the pinouts, I think it would be worth creating a 4mm version of a JAMMA adapter...if 4mm edge connectors can still be sourced. But I don't think it would be a good idea to clean out Beep shop's only inventory of remaining 4mm edge connectors. At the end of the day, when you use an adapter, check to make sure the pins are lined up as best as possible. It is better to have the power pins making full contact while the signal pins can be left hanging off by the 1mm difference.
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