Re: New CBM-II discoveries

From: Michał Pleban <*lists_at_michau.name*> Date: Tue, 26 Jun 2018 21:35:12 +0200 Message-ID: <5B329570.3070802@michau.name> · lists_at_michau.name

Steve Gray wrote:

> The schematic says 6523 or 6525. Can you not replace these with the
> D8255 chip like was done on the 8088 card?

The biggest problem with the 8255 is that the direction of individual
bits cannot be changed (and then the direction of the while port is
changed, the port is reset as we discussed before). So it depends on hoe
the other ports of the 6523 are used?

Regards,
Michau.