Unindentifiable motherboard port (II Plus clone)

[spec@vax2.concordia.ca (Mitchell Spector)]

    I recently had a closer look at my "Fugu Elite-5" (Taiwanese
Apple II Plus clone) and noticed there is a _male_ DB9 connector
port attached to the motherboard--to the left of the composite
video and casette in/out connectors ports. It should be noted this
is NOT a bit for bit copy of the II Plus (or IIe) board design,
for example it has a Z80 co-processor, lowercase character generator
and 64K RAM built-in, and the machine's firmware (a single EPROM)
placed is on a slot-0 card. It also lacks a slot 4 (or was that 5?)
and has 7 slots in total (no auxiliary slot, it's a II Plus clone).

    At first glance I thought it might be an external joystick
connector like the IIe has, but this it is a MALE port so that
would be illogical. I also thought perhaps it may be a digital 
joystick port, so I plugged one of my Atari 2600/C64/Amiga 
joysticks in there (had to remove the board since the case since
it blocks the DB9) and that didn't do much. I did notice moving 
the stick to the left caused the machine to do the equivalent of 
a Control-Reset.

    Does anyone know what this port may be? An analog joystick
port with the gender reversed? A digital joystick port, or a
mouse port or some kind of A/D input? I'm rather curious as to
what it's function is.

Mitchell Spector
spec@vax2.concordia.ca