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changeset 1831:6fe4ae830c4d

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Fix for known alpha disk control bits.
author afra
date Sun, 08 May 2005 20:14:46 +0000
parents d1f2f21d6af7
children 4ea2e417a48e
files defs/dgndefs
diffstat 1 files changed, 3 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/defs/dgndefs	Thu May 05 12:43:28 2005 +0000
+++ b/defs/dgndefs	Sun May 08 20:14:46 2005 +0000
@@ -137,13 +137,15 @@
 * Disk IO bitmasks (Dragon Alpha).
 NMIEnA    	EQU		%10000000	This is just a guess, but in current code just used as a flag 
 WPCEnA    	EQU   		%01000000 	According to circuit trace by R.Harding.
-SDensEnA  	EQU   		%00000000 	DDen is pulled low on the alpha, so always enabled.
+SDensEnA  	EQU   		%00100000 	DDen, from circuit trace on R.Harding's machine.
 MotorOnA  	EQU   		%00010000 	
 Drive0A		EQU		%00000001
 Drive1A		EQU		%00000010
 Drive2A		EQU		%00000100
 Drive3A		EQU		%00001000
 
+Mask58		EQU		%01111111	And mask to make sure 5.25" clock selected by WD2797
+
 * Disk Commands
 FrcInt   	EQU   	%11010000 
 ReadCmnd 	EQU   	%10001000