Not much people responding!
Maybe I was rude a bit, by not giving a link to specific Ralf Brown interrup
list function:
https://www.ctyme.com/intr/rb-1514.htm
The original function:
static bool joystick_detected()
{
struct joystick joystick;
joystick_read(&joystick);
return joystick.axis[0] != 0 || joystick.axis[1] != 0;
}
works correctly under dosbox, but always detect Joystick in QEMU and
VirtualBox...
my function:
static bool joystick_detected()
{
struct joystick joystick;
joystick_read(&joystick);
return (joystick.axis[0] & 0xff00) != 0x8600;
}
works correctly under QEMU and VirtualBox, but always detect joystick in
dosbox...
so when there is no joystick, and it is detected, the program hang in calibrate
joystick function.
How I test in dosbox?
The default dosbox.conf file is:
# Suggested DOSBox configuration for DOS Defender
# Usage: dosbox -conf dosbox.conf dosdef.com
[sdl]
output=opengl
windowresolution=1280x800
[cpu]
core=dynamic
cycles=max
and as seen in it, can be tested with
dosbox -conf dosbox.conf dosdef.com
but as I don't have a joystick, I added joystick emulation to dosbox.conf:
[joystick]
joysticktype=2axis
timed=false
autofire=false
swap34=false
buttonwrap=false
After that I do:
dosbox -conf dosbox.conf
Ctrl-F1
then I add key bindings (wish I could add mouse bindings):
to X-
to X+
to 1
to 2
then save
after that I:
dosbox -conf dosbox.conf dosdef.com
and then I am able to calibrate, with the keys I defined ... then play a bit.
So my version is still usable in dosbox (dosbox always think there is a
joystick present0...
But also works in QEMU and VirtualBOX (giving an error and exiting when there
is no joystck).
For this reason I believe my version is better for FreeDOS than the original
one (which is better for DosBox).
Probably DosBox should be fixed to return AH=86h when no joystick is present.
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