Re: Misbehaving WildCard 2

[Ivan X <noreply@noreplyxyz.com>]

In case this interests anyone, I fiddled with it a bit more, and discovered
two things:

1) when you press the button, it does a hard jump to $3FB, the NMI vector.
Therefore, the behavior varies depending upon what's there; when DOS 3.3 is
loaded, it beeps and enters the monitor because there's a JMP $FF65 there.
But it's obviously not very useful if the behavior isn't consistent.

2) the behavior is identical even when the main PROM is removed. I'm not
sure what to conclude from this.

I don't have a lot of knowledge about how NMI's work, so any insight here
would be welcome. Are there any known ROM dumps of the PROM?

Thanks,
Ivan.


On 12/29/09 3:50 AM, in article C75F2CE8.1930E%noreply@noreplyxyz.com, "Ivan
X" <noreply@noreplyxyz.com> wrote:

> I picked up a Central Point Wildcard 2. It looks identical to what's
> pictured here: http://apple2info.net/hardware/wildcard2/wildcard2.htm
> 
> But rather than giving me the menu it is supposed to, it instead either
> freezes the machine cold, or beeps and enters the monitor. This is on an
> unenhanced //e. The person I got it from reported the same thing.
> 
> Does anyone have any idea what might be wrong? Should I reseat the chips,
> etc?
> 
> Thanks,
> Ivan.
> 
> 
> 
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