Control Data Cyber 170 State Hardware Reference Manual page 229

Two-Port Multiplexer Programming
Set Operation Mode to the Terminal (03XX)
T h i s code p e r m i t s t h e PP t o set t h e t e r m i n a l o p e r a t i o n mode r e g i s t e r .
A 1 2 - b i t
f u n c t i o n code word from t h e PP s p e c i f i e s t h e o p e r a t i o n of t h e t e r m i n a l . T h i s -
word i s decoded i n t h e f u n c t i o n r e g i s t e r . Segments of t h e word d e f i n e t h e mode
a s follows:
B i t S t a t u s
Not used.
N o p a r i t y .
When t h i s b i t i s s e t , i t e l i m i n a t e s t h e p a r i t y b i t from t h e
t r a n s m i t t e d and r e c e i v e d c h a r a c t e r s . The s t o p b i t ( s ) immediately
f o l l o w t h e l a s t d a t a b i t .
Number of s t o p b i t s .
T h i s b i t s e l e c t s t h e number of s t o p b i t s , 1 o r 2 , t o be appended
immediately a f t e r t h e p a r i t y b i t .
When t h i s b i t i s c l e a r , i t
i n s e r t s 1 s t o p b i t and when s e t , i t i n s e r t s 2 s t o p b i t s .
Number of b i t s p e r c h a r a c t e r .
These 2 b i t s a r e i n t e r n a l l y decoded t o s e l e c t 5 , 6 , 7 , o r
8
d a t a
b i t s p e r c h a r a c t e r .
B i t 6 1 B i t 62 B i t s Per C h a r a c t e r
0 0 5
0 1 6
- 1
0 7
1 1
8
Odd/even p a r i t y s e l e c t .
T h i s b i t s e l e c t s t h e t y p e of p a r i t y t h a t w i l l be appended
immediately a f t e r t h e d a t a b i t s . It a l s o determines t h e p a r i t y
t h a t w i l l be checked on read d a t a .
Set/Clear Data Terminal Ready (04XX)
This code p e r m i t s t h e PP t o s e t o r c l e a r t h e t e r m i n a l c o n t r o l s i g n a l , d a t a
t e r m i n a l ready (DTR). When b i t 63 i s s e t , DTR i s a c t i v e , and when b i t 6 3 i s
c l e a r , DTR i s i n a c t i v e .