[vcf-midatlantic] Known-good IBM joystick?

[Douglas Crawford]

On 7/10/2018 1:06 PM, Bill Degnan via vcf-midatlantic wrote:
> On Tue, Jul 10, 2018 at 12:49 PM Douglas Crawford via vcf-midatlantic <
> vcf-midatlantic at lists.vcfed.org> wrote:
>
>> If you are getting the same behavior from multiple joysticks, I'd fault
>> the card or the code.
>> (Unless of course these somehow aren't joysticks compatible with the
>> card...)
>>
>> The bits talked about here I assume are part of your logic, not the
>> related to the stick command.
>>
>> "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."
>>
>> This sounds vaguely like the variable clobbering you had last year with
>> the first lego code you were
>> working on last year when you thought there was a bug in BASIC.  Can you
>> post the code?
>>
>> Have you tried a simple test program for the joystick by itself to prove
>> in fact the joystick
>> is working right or not?
>>
>>
>>
> Having taught a class that included the differences in BASIC between
> different systems did they provide in their code samples a comparison chart
> of "if IBM do this" , "if Apple do that"?  I assume you know and found all
> platform-centric code.  I may have in my slide presentation a chart with
> common differences, but there are subtle little things.
> b

Its a good point.  A review by someone who could spot such likely 
problem areas would be a good idea..