Hello Ruud,
> > 1. You've got to emulate the behaviour of the DDR at $0000, too.
> > So I has got to be a more sophisticated latch. (I don't know
> > the 373, so I cannot say if it would handle this correctly).
> The circuit only uses P1 which is an output after the I/O
> initialisation. And I
> don't know of any program changing it for any reason.
Hm, well. I haven't found that issue of RUN yet, so I told you just from
my memory. Anywhere, it is important to emulate the DDR for 100%
compatibility. Even if no program uses the DDR, w/o a proper emulation,
you would be only 99% compatible or so...
> That is what I think as well. But if there is nothing to be
> seen on the
> address- or databus, how does this external 6510 know what to do ??????
You obviously have seen the reason in the following:
> What you're saying is that the external 6510 is executing the
> same program as
> the internal one? I never had thought about that. I thought
> that it was
> "sleeping" or whatever because its busses had been disabled.
Well, the buses are not disabled, they just don't drive the bus!
> If the above is the case, then next question: are all produced
> 6510's the same
> and if not, does that matter in this case?
Well, you're right, they've got to behave exactly the same for having
this circuitry working. I don't know if all are the same, but at least
until the date where that RUN issue was published, I really hope so.
Greetings,
Spiro.
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