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@5FE5.ADF GPA-1000 Game port adapter
GPA-1000.zip
GPA-1000
One Port Operation
The top port is used with software that calls for 1 joystick
or 1 player games.
Adapter Not Detected
The BIOS in the PS/2 may not acknowledge the
presence of a joystick adapter installed in the system
(this problem is
not related to the board installation/configuration
provided through the
POS by the IBM setup utilities). Therefore, any
game that checks
the BIOS equipment list may report that there is no
joystick installed.
To correct this problem, execute the program GPA-INST.EXE
This program will update the BIOS equipment list to
include the GPA-1000.
Related Info (from Peter)
The gameport is a typical example for ISA-style
arbitrated passive
MCA cards. The joystick base-I/O port is already defined
in the BIOS and
once the hardware addresses this - and only this port -
it is recognized
by the BIOS and used. No IRQ, no DMA, no RAM or ROM area
occupied - just
plain polled I/O ... from the definition of the MCA this
card is a "I/O
slave" and it not even needs an ADF.
The better cards however supply ADFs and
come with own
card-ID - to avoid problems during automatic
configuration and to define
the used resources. But there are joystick cards for MCA
that just "plug
in" and need no ADF. Installed a few of them in 1988 or
so for some customers
who *claimed* it were for a serious purpose (but no one
believed that ...).
And please keep in mind that "joystick" on these
adapter cards
does not mean one of these silly switch-triggered beasts
but one with potentiometers
(like on RC-car controls). See "sound" on Louis' page
and look for the
schematic diagram of the Audiovation joy-port. There's a
small graphic
on how the joystick is wired internally.
ADF Sections GPA-1000 Game port adapter
Port ENABLE
Select ENABLE
to activate the GPA-1000. Select DISABLE to
effectively remove
the GPA-1000 from the system."
ENABLE
(io 0201H - 0201H) or DISABLE
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