Tandy 1000 SL Technical Reference Manual page 139

3 9
FDACKIB
4 4
I
FDC c o n t r o l l e r
a c k n o w l e d g e
o u t p u t s i g n a l when
i s
LOW.
a c k n o w l e d g e o u t p u t
s i g n a l when i s
LOW.
40 FDACKOB 2ma 4 5
0 FDC
c o n t r o l l e r
41 FDCINT
39
I
F l o p p y d i s k
i n t e r r u p t i n p u t
s i g n a l when
i s
H I G H ,
4 2
FDCDMRQ
4 3 I
4 3 FDCDRQ 4ma 4 8
0
4 4
IRQ2 5 I
4 5
I R Q 3
6 I
4 6 IRQ4
7
I
4 7 I R Q 5
8 I
48
IRQ6
1 0
I
4 9 IRQ7
9
I
(S.T. Pull-up)
( S O T .
Pull-up)
( S o
T
.
Pull-up)
(S.T. Pull-up)
( 3 - s t a t e , Pull-up)
(S.T. Pull-up)
F l o p p y d i s k s e r v i c e
r e q u e s t i n p u t s i g n a l
t o
DMA
when
i s
LOW.
F l o p p y d i s k s e r v i c e
r e q u e s t o u t p u t
s i g n a l t o t h e
DMA
when i s
LOW.
I n t e r r u p t r e q u e s t
2
i n p u t s i g n a l
I n t e r r u p t r e q u e s t
3
i n p u t s i g n a l
I n t e r r u p t r e q u e s t
4
i npu t s i g n
a
1
I n t e r r u p t r e q u e s t
5
i n p u t
s
i g n a l
I n t e r r u p t r e q u e s t 6
i n p u t / o u t p u t s i g n a l
I n t e r r u p t r e q u e s t 7
i n p u t s i g n a l
7