Tandy 1000 SL Technical Reference Manual page 41

Description
D M A C o n t r o l l e r
IOW- =
0 , Master
C l e a r
IOR- = 0 , R e a d T e m p o r a r y R e g i s t e r
D M A C o n t r o l l e r
IOW- = 0 , C l e a r Mask R e g i s t e r
IOR- = 0 , I l l e g a l
D M A C o n t r o l l e r
IOW-
= 0 , W r i t e
A l l Mask R e g i s t e r B i t s
B i t D e s c r i p t i o n
0 0 = C l e a r C h a n n e l 0 Mask B i t ( E n a b l e )
1
0 = C l e a r C h a n n e l 1 Mask B i t ( E n a b l e )
2
0
=
C l e a r C h a n n e l 2 Mask B i t ( E n a b l e )
3 0 = C l e a r C h a n n e l 3 Mask B i t ( E n a b l e )
1 =
Set C h a n n e l 0 Mask B i t ( D i s a b l e
1
= S e t C h a n n e l 1 Mask B i t ( D i s a b l e
1 = Set C h a n n e l
2
Mask B i t ( D i s a b l e
1 = Set C h a n n e l 3 Mask B i t ( D i s a b l e
4-7 D o n ' t C a r e
IOR- = 0 , I l l e g a l
0010
-
OOlF
s a m e as
0 0 0 0 - 0 0 0 ~
30