Tandy 1000 SL Technical Reference Manual page 109

PORT
6 2
-
WRITE ONLY I N BUFFER BLUE
B I T 3:
0 = S l o w CPUCLK ( d e f a u l t )
1 = F a s t
CPUCLK
PORT
6 5
-
WRITE ONLY I N BUFFER BLUE
B I T
2: 0
=
1 6 B i t V i d e o
1 = 8
B i t V i d e o ( d e f a u l t )
PORT 80
DMA Page R e g . ( N o t U s e d )
PORT 8 1
-
WRITE ONLY
B i t D e s c r
i p t i o n
0 DMA C h 2 A d d r e s s A 1 6
1
DMA C h 2 A d d r e s s A 1 7
2 DMA C h 2 A d d r e s s A 1 8
3
DMA C h 2 A d d r e s s A 1 9
4-7
N o t U s e d
PORT
82
-
WRITE ONLY
B i t
D e s c
r
i p t
i o n
0 DMA C h 3 A d d r e s s A 1 6
1
DMA C h 3 A d d r e s s A 1 7
2 DMA C h 3 A d d r e s s A 1 8
3 DMA C h 3 A d d r e s s A 1 9
4-7
N o t U s e d
PORT 83
-
WRITE ONLY
B i t D e s c r i p t i o n
0 DMA C h 0
-
1 A d d r e s s A 1 6
1
DMA C h 0
-
1
A d d r e s s A 1 7
2 DMA C h 0
-
1 A d d r e s s A 1 8
3
DMA C h 0
-
1 A d d r e s s A 1 9
4-7 N o t U s e d
PORT A0
-
NMI M a s k R e g i s t e r ,
Write
o n l y
B i t
D e s c r i p t
i o n
7
1 =
E n a b l e NMI
0 = D i s a b l e NMI ( d e f a u l t )
1 6