Tandy 1000 SL Technical Reference Manual page 60

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A d d r e s s
D e s c r i p t i o n
0
3 D F
C R T
Processor
Page
R e g i s t e r
-
V i d e o M e m o r y R e l a t i v e
B i t
0
B i t
1
B i t 2
B i t
3
B i t 4
B i t
5
B i t
6
B i t
7
A 1 4
C R T
Page 0
A 1 5
C R T
Page
1
A 1 4
Processor Page 0
A 1 5
Processor Page 1
A 1 6
Processor Page
2
V i d e o A d d r e s s
Mode 0
V i d e o A d d r e s s
Mode 1
A 1 6
C R T
Page
2
video
DO
D7
D e s c r i p t i o n s
3DDH
3 D F H
8p
1
-
1 6 K
0
0
8p
2
-
8 K
0
0
4 p
2
-
1 6 K
0
1
4 p
4
-
8 K
0
1
4 p
1
-
3 2 K
1
0
2 p
2
-
3 2 K
1
0
0 3 E O - 0 3 E F
R e s e r v e d
0
3F0
N o t U s e d
0 3F1
D r i v e
Select
S w i t c h
B i t
0
N o t U s e d
B i t
1
"1"
DSO
=
DSO
" 0 " DSO = D S 1
B i t
2
N o t U s e d
B i t
3
Mux
FDCDMATC
( W r i t e
O n l y )
B i t 4
N o t U s e d
B i t
5
N o t U s e d
B i t
6
N o t U s e d
B i t
7
N o t
used
llo"
FDCDMATC O u t
1 I n p u t
0
3 F 2
D 6
3 D F H
0
1
0
1
0
1
DOR R e g i s t e r
( W r i t e o n l y )
B i t s
0-1
D r i v e
Select
B i t
1
B i t
0
0
0
D r i v e
Select
A*
0
1
D r i v e
Select
B*
B i t 2
0 =
FDC R e s e t
B i t
3
1 =
E n a b l e DMA R e q u e s t / I n t e r r u p t
B i t
4
1
= D r i v e A
Motor
On
B i t
5
1 =
D r i v e B
Motor
On
B i t
6
1 =
FDC T e r m i n a l C o u n t
B i t
7
N o t U s e d
4 9

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