Tandy 1000 SL Technical Reference Manual page 62

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Address
D e s c r i p t i o n
0 3F9
D i v i s o r L a t c h MSB
( D i v i s o r
L a t c h
Access
B i t DLAB =
"1")
B i t
D e s c r i p t i o n
0
B i t
0
1
B i t
1
2
B i t 2
3
B i t 3
4
B i t
4
5
B i t
5
6
B i t
6
7
B i t 7
0 3F9
03FA
I n t e r r u p t E n a b l e R e g i s t e r
B i t
D e s c r i p t i o n
0
"1"
= E n a b l e s t h e R e c e i v e d Data A v a i l a b l e
1
"1"
= E n a b l e s t h e T r a n s m i t t e r H o l d i n g R e g i s t e r I n t
2
1 ' 1 " = E n a b l e s R e c e i v e L i n e S t a t u s I n t e r r u p t
3
"1" = E n a b l e s t h e Modem S t a t u s I n t e r r u p t
4-7
Always L o g i c a l "0"
I n t e r r u p t
I n t e r r u p t I d e n t i f i c a t i o n R e g i s t e r
B i t
D e s c r i p t i o n
0
I I
0
I I
=
I n t e r r u p t
P e n d i n g
1-2
B i t 2
B i t
1
I I
0
I I
"0
n
F o u r t h L e v e l P r i o r i t y
"
0
I I
I I
1
n
T h i r d L e v e l P r i o r i t y
1 1
1
I I
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S e c o n d L e v e l P r i o r i t y
1 1
1
n
1 1 1
n
H i g h e s t L e v e l P r i o r i t y
3-7
Always L o g i c a l
"0"
5 1

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