Subject: Re: Unindentifiable motherboard port (II Plus clone)
From: david@uow.edu.au (David Wilson)
Date: Tue, Dec 1, 1998 06Ç13#  
Message-id: <david.912561195@wraith>

dalloff@freenet.columbus.oh.us (Dave Althoff) writes:
>Michael Black (blackm00@CAM.ORG) wrote:
>: I have a II clone board that I found in the garbage at one point.  It was
>: missing parts, so it's scrap.  But it had two DB-9 connectors on it.  One
>: of them I took off for something else, but the remaining one is male and
>: I assume the missing one was male too.  They are both labelld (in silk
>: screening on the board) "Game I/O".  The IC's that would be in the
>: joystick circuitry are right near it.

My Multitech MPF-III (//e clone) uses DE-9M plugs for both the keyboard and
the joystick ports.

If they are both labeled Game I/O I would hazard a guess that they both have
the same signals but that AN0/1 are swapped with AN2/3 on the second port.
Probably something similar with the push buttons. The advantage of this
would be that you could plug two standard (apart from the sex of the plug)
joysticks in at the same time for two player games.

Pet Peeve time: it is not a DB-9 but a DE-9. The D is the shape of the plug,
the letter tells you the size and the number the pin count. Here are the
standard ones:

DE-9	(AT serial port, Apple //e joystick)
DA-15	(IBM PC joystick)
DB-25	(standard serial port)
DC-37	(IBM-PC external floppy)
DD-50	(some really old SCSI devices from Sun etc)

And these are the high density ones:

DE-15	(VGA monitor)
DA-26
DB-44
DC-62

Other than the DB-25, the DD-50 is about the only one people get right.
All the rest get lumped together as DB-xx.
--
David Wilson  School of IT & CS, Uni of Wollongong, Australia  david@uow.edu.au