Tandy 1000 SL Technical Reference Manual page 40

Address D e s c r i p t i o n
OOOB
DMA
C o n t r o l l e r
IOW- = 0 , W r i t e Mode R e g i s t e r
B i t D e s c r i p t i o n
B i t s 0-1
B i t
1 B i t 0
0 0
C h a n n e l 0 S e l e c t
0 1
C h a n n e l 1 S e l e c t
1
0 C h a n n e l
2 S e l e c t
1 1
C h a n n e l
3 S e l e c t
B i t s 2-3
B i t s
3 B i t
2
0
0 V e r i f y T r a n s f e r
0 1 W r i t e T r a n s f e r To Memory
f
1 0
Read T r a n s f e r To Memory
,
\
1 1
I l l e g a l
X I f
B i t s 6 a n d 7
=
1 1
t
B i t 4
0
1
A u t o i n i t i a l i z a t i o n E n a b l e
A u t o i n i t i a l i z a t i o n D i s a b l e
B i t
5
0 Address I n c r e m e n t S e l e c t
1
A d d r e s s
Decrement
S e l e c t
B i t s
6-7
B i t
7
B i t
6
0
0 Demand Mode S e l e c t
1
0 B l o c k Mode Select
--
"
1 1 Cascade Mode S e l e c t
- 0
1 S i n g l e Mode S e l e c t
-,
IOR-
= 0 , I l l e g a l
o o o c
DMA
C o n t r o l l e r
IOW- = 0, Clear B y t e P o i n t e r F l i p / F l o p
I O R - = 0 , I l l e g a l
29