Re: Jeri board and extra things

From: Ruud Baltissen (
Date: 2001-05-03 08:48:06

> 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
> 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
> 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:
- CLK2
- 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

This message was sent through the cbm-hackers mailing list.
To unsubscribe: echo unsubscribe | mail

Archive generated by hypermail 2.1.1.