On Thu, 3 May 2001, Ruud Baltissen wrote: > > The idea is excellent! In the old days you could expand the expansion slot > > with more slots. The producers claimed that their cards made it possible > to > > activate only the card of your choice using switches. But I found out that > > no card worked as it should. I had my own ideas about it but your idea > just > > revived it. Will tell more about it tomorrow. > > And that is now. > > The problem was that one expansion only disconnected +5V, the other only the > I/O lines etc. etc. > > IMHO the following lines have to be disabled in one or another way: > - EXROM > - GAME > - CLK2 Keep this connected in case you need it for ram refresh or a clock. > - ROML > - ROMH > - IO1 > - IO2 > > For every slot one 541 will do to connect the above signals with the C64. > One 573 is enough to handle up to 8 slots. > > The only problem is maybe the lengh of the busses. We cannot equip this slot > expander with buffers as we have no means to tell when the buffer should be > activated and, more important, in what direction. > > Groetjes, Ruud > > http://Ruud.C64.org > > > > > - > This message was sent through the cbm-hackers mailing list. > To unsubscribe: echo unsubscribe | mail email@example.com. > - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
Archive generated by hypermail 2.1.1.