> I'll put this theory here now:
>
> -These Japanese MSX2+ machines (maybe even some MSX2's?) use the
> pause function of this T9769 MSX2+ engine, which uses a
> hardware-controlled method, and is really hard to disable.
>
> -On the Turbo-R in R800 mode, it is software-controlled, and can be
> disabled by making sure that no BIOS interrupt-routine gets in the
> way
>
> -On the Turbo-R in Z80 mode, it uses the same method as with the
> MSX2+ machines above, and is really hard to disable again.
>
> That would be a clear explanation of everything we heard so far.
>
> So how does this pause key work on the Turbo-R?
It all makes sense now...
The Z80 of the turbo R is part of the MSX engine. That explains the
hardware pause option in Z80 mode.
The R800 is a seperate IC, so the engine pause hardware doesn't
directly affect it. So the turbo R designers had to find a different
way of implementing the pause key in R800 mode, and they chose to do
it in software.
Thanks for your input, now my mind is finally at ease!
Bye,
Maarten
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