Tandy 1000 SL Technical Reference Manual page 105

6 . 0
PORT DEFINITION M A P
PORT 0 0
PORT 0 1
PORT 0 2
PORT 0 3
PORT
0 4
PORT 0 5
DMA C o n t r o l l e r
IOW* = 0: C h a n n e l 0 Base and C u r r e n t A d d r e s s
I n t e r n a l F l i p / F l o p = 0:
Write
AO-A7
I n t e r n a l F l i p / F l o p = 1: Write
A8-Al5
I n t e r n a l
F l i p / F l o p
= 0:
Read AO-A7
I n t e r n a l F l i p / F l o p = 1: Read A8-Al5
I O R * = 0: C h a n n e l 0 C u r r e n t A d d r e s s
DMA
C o n t r o l l e r
IOW* = 0: C h a n n e l 0
Base and
C u r r e n t
Word C o u n t
I n t e r n a l F l i p / F l o p = 0: Write
WO-W7
I n t e r n a l F l i p / F l o p =
1: Write
W8-Wl5
I n t e r n a l F l i p / F l o p = 0: Read WO-W7
I n t e r n a l F l i p / F l o p = 1: Read W8-Wl5
IOR*
= 0: C h a n n e l 0 C u r r e n t Word C o u n t
DMA C o n t r o l l e r
IOW* = 0: C h a n n e l 1 Base
a n d C u r r e n t A d d r e s s
I n t e r n a l F l i p / F l o p = 0: Write
AO-A7
I n t e r n a l F l i p / F l o p = 1: Write
A8-Al5
I n t e r n a l F l i p / F l o p = 0: Read AO-A7
I n t e r n a l F l i p / F l o p = 1: Read A8-Al5
I O R * =
0 C h a n n e l
1 C u r r e n t
A d d r e s s
DMA C o n t r o l l e r
IOW* = 0: C h a n n e l 1 Base a n d C u r r e n t Word C o u n t
I n t e r n a l F l i p / F l o p = 0:
Write
WO-W7
I n t e r n a l
F l i p / F l o p = 1: Write
W8-Wl5
I n t e r n a l F l i p / F l o p = 0: Read WO-W7
I n t e r n a l F l i p / F l o p = 1: Read W8-Wl5
I O R *
= 0: C h a n n e l 1 C u r r e n t Word
C o u n t
DMA C o n t r o l l e r
IOW*
= 0: C h a n n e l 2 Base a n d C u r r e n t A d d r e s s
I n t e r n a l F l i p / F l o p = 0: Write
AO-A7
I n t e r n a l
F l i p / F l o p = 1: Write
A8-Al5
I n t e r n a l F l i p / F l o p = 0: Read AO-A7
I n t e r n a l F l i p / F l o p = 1: Read A8-Al5
I O R * = 0: C h a n n e l 2 C u r r e n t A d d r e s s
DMA C o n t r o l l e r
IOW* = 0: C h a n n e l
2
Base and C u r r e n t Word C o u n t
I n t e r n a l F l i p / F l o p = 0:
Write
WO-W7
I n t e r n a l F l i p / F l o p = 1: Write
W8-Wl5
I n t e r n a l F l i p / F l o p = 0:
Read WO-W7
I n t e r n a l F l i p / F l o p = 1:
Read W8-Wl5
IOR*
= 0: C h a n n e l 2 C u r r e n t Word
Count
1 2