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@5FE5.ADF GPA-1000 Game port adapter
GPA-1000.zip Contains GPA-INST.EXE (see below), ADF, and README
GPA-1000 Adapter
Adapter Not Detected
Related Info
ADF Sections
GPA-1000 Adapter
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
GPA-INST.EXE program (from the GPA-1000 archive).
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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