Tandy 1000 SL Technical Reference Manual page 37

A d d
res s
0 0 0 4
0005
0 0 0 6
J007
D e s c r i p t i o n
DMA C o n t r o l l e r
IOW- = 0: c h a n n e l 2 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:
W r i t e 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 2 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 ~ 8 - ~ 1 5
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 Word C o u n t
I n t e r n a l F l i p / F l o p
= 0: Write
W O - W 7
I n t e r n a l
F l i p / F l o p
= 1: Write
AW-W15
IOR- = 0: C h a n n e l 2 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 W O - W 7
I n t e r n a l F l i p / F l o p
= 1:
Read W8-Wl5
DMA C o n t r o l l e r
IOW- = 0: c h a n n e l 3 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:
W r i t e
A O - A ~
I n t e r n a l F l i p / F l o p =
1: Write ~ 8 - ~ 1 5
I O R - = 0: C h a n n e l 3 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 ~ 8 - ~ 1 5
DMA
C o n t r o l l e r
IOW-
= 0: C h a n n e l 3 Base a n d C u r r e n t Word
Count
I n t e r n a l F l i p / F l o p
= 0: Write
W O - W 7
I n t e r n a l F l i p / F l o p
= 1: Write
AW-W15
I O R - =
0: C h a n n e l 3 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
26