Sega I/O Rev. A Vs Rev. B

OldFoo · Post by **OldFoo** » Thu Oct 26, 2006 11:14 am

Ok,

Sega JAMMA I/O

Rev A, Rev B, what's the difference????

John

OldFoo · Post by **OldFoo** » Thu Oct 26, 2006 12:23 pm

Version A is the JVS 1 found in Naomi cabs, Version B is the Jamma 1.

OldFoo · Post by **OldFoo** » Mon Nov 13, 2006 11:48 am

Nope,

Both JAMMA I/O's, one marked Rev A on the PCB and EPROM, and the other marked Rev B.

Any Ideas??

OldFoo · Post by **OldFoo** » Mon Nov 13, 2006 1:02 pm

Then I'm stumped :smt011

OldFoo · Post by **OldFoo** » Mon Nov 13, 2006 2:36 pm

I'll take some piccys tonight.

OldFoo · Post by **OldFoo** » Mon Nov 13, 2006 6:36 pm

OK,

Rev A.

Rev B.

Any Help???

OldFoo · Post by **OldFoo** » Mon Nov 13, 2006 7:15 pm

interesting thing...

maybe the rev.a is the sega io who has problem with gg xx, etc...

OldFoo · Post by **OldFoo** » Mon Nov 13, 2006 7:37 pm

I've just noticed 2 physical differences after looking at the pictures I posted.

The Rev A board has AUTO-10 printed on it (just below the EPROM)

The 2nd difference is JP1 (next to the Cap - Again under the EPROM)

On Rev A, the jumper is set to A, and on Rev B, it's set to B.

OldFoo · Post by **OldFoo** » Mon Nov 13, 2006 11:56 pm

The revision B has been updated to automatically detect whether the power is being supplied by the jamma edge or the JST connector. I think you had to plan and choose with rev. A or you might blow something. I think there are a couple of fixes as well. I think one of the fixes has to do with how coins were registered.