Tandy 1000 SL Technical Reference Manual page 36

Address
Description
0 0 0 0 DMA C o n t r o l l e r
IOW-
=
0: C h a n n e l 0 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: W r i t e A8-Al5
IOR-
=
0:
C h a n n e l 0 C u r r e n t Address
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
0 0 0 1
DMA
C o n t r o l l e r
IOW-
= 0: C h a n n e l 0 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: W r i t e WO-w7
I n t e r n a l l ? l i p / F l o p =
1: Write AW-W15
I O R -
= 0: C h a n n e l 0 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: Read WO-w7
I n t e r n a l F l i p / F l o p = 1: Read W8-Wl5
0 0 0 2
DMA
C o n t r o l l e r
IOW- =
0: C h a n n e l 1 B a s e 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
A O - A ~
I n t e r n a l F l i p / F l o p = 1: write
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
I n t e r n a l F l i p / F l o p = 0: Read A O - A ~
I n t e r n a l F l i p / F l o p = 1: Read A 8 - ~ 1 5
0 0 0 3
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:
W r i t e WO-w7
I n t e r n a l F l i p / F l o p = 1:
Write
AW-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
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
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