ruud.baltissen@abp.nl wrote:
>
> The 6502->8501 design is based on my 6502->6510 design. And the 6510 has a
> data-direction register. (Although I wonder if it is used ever again aftre
> the first initialisation)
>
As a side note, we used to use a bit in the DDR for keeping track of
whether the user had selected trainer-mode or not back in the good old
days of "cracking" games. Never ever came across a single app that
touches it.
--
Christer Palm
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