[vcf-midatlantic] Known-good IBM joystick?

Evan Koblentz evan at vcfed.org
Tue Jul 10 12:39:48 EDT 2018


>> The BASICs are 100% compatible?  You just had one change and it works on
the IBM?

Pretty much! I also changed the joystick button code. Applesoft uses a PEEK
to check for button presses, BASICA uses the STRIG command. Everything else
is the same.

On Tue, Jul 10, 2018, 12:32 PM Bill Degnan via vcf-midatlantic <
vcf-midatlantic at lists.vcfed.org> wrote:

> On Tue, Jul 10, 2018 at 11:53 AM Evan Koblentz via vcf-midatlantic <
> vcf-midatlantic at lists.vcfed.org> wrote:
>
> > I'm using a Compaq Portable III (286). I forgot the card brand but I
> > vaguely recall it might also be Kraft. I'm programming in the BASICA from
> > the correct Compaq-branded boot disk. I use the STICK command; not
> > PEEK/POKE.
> >
> > I can test the same joystick against the Apple side tomorrow.
> >
> > In a test program, I was only getting a range of about 5 to 195, vs.
> 0-255.
> >
> > To "port" the code from Apple to IBM platform, I replaced the Applesoft
> > PDL(0) and PDL(1) commands with STICK.
> >
> > The way my code works is, when I move the stick beyond a neutral range
> > (say, within 75 of either end), then it turns on the robot motors on the
> > correct directions.
> >
> > The logic is fine: works with the Apple joystick on the Laser 128, and
> as I
> > said I'll test that again with the Kraft tomorrow on the Laser.
> >
> > But when I tried it on the Compaq, only two of the directions work
> > correctly. It was something like left and forward; I forget exactly. One
> > other direction turns on the wrong bits (1 and 4, same as its opposite
> > direction, rather than 2 and 3 which it should be), even though I'm a
> > million percent certain the code is right. Another direction works (bits
> 2
> > and 4) if I move the stick to its extreme edge, but while en route it
> turns
> > on bit 3 for a second. That makes no sense! That's why I think the stick
> > might be funky or somehow misadjusted even if it does work on the Apple
> > side.
> >
> >
> >
> The BASICs are 100% compatible?  You just had one change and it works on
> the IBM?
> b
>


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