ruud.baltissen@abp.nl schrieb:
>
>
> 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) AFAIK the 8501 has a DDR as well. So the 6529
<nitpicking>
The only way to measure the temperature of the CPU!
</nitpicking>
As published by Richard Atkinson:
set DDR as output
set DR as one
set DDR as input
wait until DR is zero
However, because there are no known programs for the +4 which
use this feature, it might be abandoned.
OTOH, keeping this feature would be cool!
(Completely ignoring the fact that common IO Chips do not
have such a undocumented feature as the 6510/8501)
A.K.
Message was sent through the cbm-hackers mailing list
Archive generated by hypermail 2.1.1.