> Some time ago I noticed that Turbo-R machines does that with all MSX
> system
> reserved I/O port ... Then if you try to read any I/O port that has a
> internal
> pehiperal installed the S1990 chip engine will block output from the
> cartridge.
> I guess it's made this way to avoid "totem pole" (bit conflicts) of
> S1990
> internal buffer with the internal machine devices such as PPI, VDP,
> PSG , Mapper, etc ....
>
This seems verry unlogical, what you say would imply that you can't read
your vram from port #98 for example.
Or do you mean that it has the resistors on all external slots?
Can somebody confirm your story or can you give example where it blocks
those bits?
David
.--.
|o_o |
|:_/ | "One difference between SuSE and Red Hat is that the
// \ \ former operates in a country where people don't sue
(| | ) each other over coffee being too hot."
/'\_ _/`\ Linus Torvalds
\___)=(___/
****
MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED]
and put "unsubscribe msx [EMAIL PROTECTED]" (without the quotes) in
the body (not the subject) of the message.
Problems? contact [EMAIL PROTECTED]
More information on MSX can be found in the following places:
The MSX faq: http://www.faq.msxnet.org/
The MSX newsgroup: comp.sys.msx
The MSX IRC channel: #MSX on Undernet
****
