From: Nicolas Welte (welte_at_chemie.uni-konstanz.de)
Date: 2002-04-17 16:14:52
Professor Dredd wrote:
> 4,5,6 = Address Control:
> - 4,6 selects $DE00 (default)
> - 5,6 selects $DF00
>
> > > Use a C128, and put the T232 to $d700, I think this is
> > even described in the
>
> I have no idea how to accomplish that. It's not covered in
> the T232 documentations and, as you can see, all the pins
> are used for other functions. Perhaps it's a feature of the
> C-128 MMU?
No, it's an extra output on the address decoder chip (LS139 probably) that
decodes $d400 (SID) and $d600 (VDC). I think $d500 is not used, because the
MMU decodes itself internally, and $d700 can be used for external stuff, if
you run a wire from the correct pin to the T232 cartridge. It looks like pin
6 from above chart would be the correct choice :-)
Nicolas
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