Tandy 1000 SL Technical Reference Manual page 45

Address
D e s c r i p t i o n
0 0 2 1 825911 I n t e r r u p t C o n t r o l l e r
o p e r a t i o n C o n t r o l
Word
1
(IOR-
B i t s
0-7 I n t e r r u p t Mask F o r IRQO-IRQ7
0 Mask
Reset
( E n a b l e )
1 Mask S e t ( D i s a b l e )
N o t e : P e r i p h e r a l s r e q u e s t i n g a n i n t e r r u p t s e r v i c e must g e n e r a t e a
l o w
t o
h i g h
edge
a n d t h e n remain
a t
a l o g i c h i g h l e v e l
u n t i l s e r v i c e
i s acknowledged.
F a i l u r e
t o
do
so r e s u l t s i n
a
D e f a u l t S e r v i c e f o r
I R Q 7 .
0022-0027 Same as 0020-0021
0028-003F
N o t
Used
0040/0044 8254-2 Timer
IOW-
= 0:
Load C o u n t e r
N o . 0
IOR-
=
0: Read
C o u n t e r
N o . 0
0041/0045 8254-2 Timer
IOW-
= 0: Load C o u n t e r
N o .
1
IOR-
= 0: Read C o u n t e r
N o . 1
0042/0046 8254-2 Timer
IOW-
= 0: Load C o u n t e r
N o .
2
I O R -
= 0: Read C o u n t e r
N o .
2