68300

Hello everyone,
 
Interrupt Acknowledgement Cycles always drive the address bus to $FF FFFx.  Programming the Base Address register to $FFF8 will give the address match.
 
The programming of the option register to $6B01 will make the SPACE field = 00 for CPU space, the IPL field = 000 for all interrupts, and AVEC = 1 for generate AVEC.
 
Regards,
 
Charlie

-----Original Message-----
From: Andrei Chichak [mailto:acpmiedm@...]
Sent: Wednesday, July 16, 2003 1:17 PM
To: 68300@yahoogroups.com
Subject: RE: [68300] IRQ7 acting odd


Okay, the programming of CS6 (as it happens, this was the next open CS) to 
the values that Brian Geery gave ("$FFF8 to CSBAR6 & $6B81 to CSOR6") 
actually worked. I am now getting my interrupt.

I suspect that there is a lot more information in the CSBAR fields that I 
will have to understand deeply. Right now this seems to be JPBM (just plain 
black magic).

Charlie, can you explain why this worked and how to properly configure a 
chip select for AVEC/DSACK generation?

Thanks again,
Andrei



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