On Wed, 30 Sep 1998, Maarten ter Huurne wrote:
>
> >This mailinglist is an excellent instrument for doing this. Just look at
> >the JoyNet proposal. It is good for everyone that some (new) things are
> >standardized and agreed.
>
> JoyNet is no longer a proposal, it's a standard!
> By the way, I'm working on a game for it, but I won't say much more until I
> decide about it's release (estimate date & method).
I just meant the JoyNet proposal was discussed here, modified and agreed
to a standard.
>
> >AFAIK the only cartridges that will need modification(one wire changed)
> >are the external memorymappers if you want to use them on a modified MSX
> >(or in other words on a 7MHz MSX)
>
> Does this mean that external memorymappers are the only hardware items that
> will benefit from the modification?
No!
This BUSCLK thing is only meant for improving sound and other devices on
7MHz computers without the need to make a modification to them.
But... in this case most external mappers will need a modification (get
their clocksignal from pin16 instead of pin42)
> And according to Alwin, not even all external memorymappers use the clock
> on the cartridge port.
This is even better! These mappers will work without the modification.
>
> >No need for that, because there is a 3.58MHz clock available at pin42
> >like the MSX standard requires.
>
> This is a good idea, and makes your 7MHz MSX more compatible with the
> standard as well.
> But I have some doubts about the usefulness of the 7MHz clock on the other
> pin.
this 7MHz (or other high speed) is required for the refresh of
memorymappers. If you'd use the 3.58MHz refresh while the processor is
running at 7MHz, there will be timing/refreshing problems.
>
> >Not so negative! 'Reserved' signals are intended for future expansion!
>
> How do existing cartridges handle this? Are the reserved signals not
> connected or are they connected to the ground or ...?
must be unconnected
>
> >Don't Fight the Future ;-)
>
> I think that most future expansions won't need the clock signal anyway,
> because they have their own clock (like the MoonSound).
>
The BUSCLK signal is a solution for the current problems and provides
something that is useful for future devices and it makes the current 7MHz
things compliant with the MSX standard.
Jon
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