From: Maciej Witkowiak (ytm_at_elysium.pl)
Date: 2002-04-18 18:56:37
Nicolas Welte wrote: > > 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 $d700 is on U3 (74LS138) pin 12. $d500 is available there on pin 14, but I don't think it would work, at least in C128 mode. ytm -- We are committed to reinvent evolutionary e-relationships and integrated meta-assets. Mr. Lance Glaser Message was sent through the cbm-hackers mailing list
Archive generated by hypermail 2.1.4.