Re: BA-line

From: Marko Mäkelä (
Date: 2001-05-08 09:06:52

On Tue, 8 May 2001, Ruud Baltissen wrote:

> Studying the schematic at the end of the PRG, I noticed that the BA-line
> running from the VIC to the expansion slot crossed the one running from the
> PLA to the AND-gate. Only croosed, _NO_ connection.

The schematic diagram at the end of the Programmer's Reference Guide
contains many errors.  Get a decent schematic diagram from FUNET.

> IIRC, the BA-line becomes active some cycles before the VIC tristates the
> CPU?

Yes, three cycles before.  The processor can ignore its RDY input for at
most 3 cycles (it cannot perform more than 3 successive writes [when
executing BRK or going to process an interrupt]).


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