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changeset 1843:ed0f95f8caf4

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Added defs for Alpha NMI disable
author afra
date Fri, 17 Jun 2005 00:42:50 +0000
parents 50bdf0b95c85
children 601979dd86e0
files defs/dgndefs
diffstat 1 files changed, 5 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/defs/dgndefs	Fri Jun 17 00:41:59 2005 +0000
+++ b/defs/dgndefs	Fri Jun 17 00:42:50 2005 +0000
@@ -135,7 +135,8 @@
 
 
 * Disk IO bitmasks (Dragon Alpha).
-NMIEnA    	EQU		%10000000	This is just a guess, but in current code just used as a flag 
+NMIEnA    	EQU		%00001000	PIA2, CA2, used to enable/disable NMI 
+NMIDisA		EQU		%11110111	Bitmask to foce CA2 off, and disable NMI
 WPCEnA    	EQU   		%01000000 	According to circuit trace by R.Harding.
 SDensEnA  	EQU   		%00100000 	DDen, from circuit trace on R.Harding's machine.
 MotorOnA  	EQU   		%00010000 	
@@ -146,6 +147,9 @@
 
 Mask58		EQU		%01111111	And mask to make sure 5.25" clock selected by WD2797
 
+NMICA2En	EQU		$3C		Value for PIA CRA to enable NMI
+NMICA2Dis	EQU		$34		Value for PIA CRA to disable NMI
+
 * Disk Commands
 FrcInt   	EQU   	%11010000 
 ReadCmnd 	EQU   	%10001000