Control Data Cyber 170 State Hardware Reference Manual page 227

Two-Port Multiplexer Programming
Read Status Summary (OOXX)
T h i s code permits t h e PP t o i n p u t s t a t u s from t h e s e l e c t e d t e r m i n a l . One-word
i n p u t must f o l l o w t o r e a d t h e s t a t u s r e s p o n s e .
The r e s p o n s e i s 1 2 b i t s , w h i c h
a r e d e f i n e d a s follows.
B i t S t a t u s
52-58 Not used.
59 Output b u f f e r n o t f u l l .
60 I n p u t ready.
6 1 Data c a r r i e r d e t e c t o r c a r r i e r on.
62
Data
set
ready.
6 3
Ring i n d i c a t i o n .
PP Read Terminal Data (01 XX)
T h i s code p e r m i t s t h e PP t o i n p u t t h e terminal d a t a from t h e s e l e c t e d t e r m i n a l .
Channel 158 must be a c t i v a t e d , and a 1-word i n p u t must f o l l o w t o r e a d i n t h e
t e r m i n a l d a t a . The d a t a word i s 1 2 b i t s , which a r e d e f i n e d a s f o l l o w s .
B i t S t a t u s
52 Data set ready.
53 Data s e t ready and d a t a c a r r i e r d e t e c t o r .
54
Over r u n .
55
Framing or p a r i t y e r r o r .
56-63 8-bit d a t a .
Data Set Ready (Bit 52)
When t h e d a t a s e t ready
signal
i s a c t i v e , t h i s b i t s e t s .