IBM 1 Series - Page 141

User’s attachment
External sync
16 points DI/PI
Ready
External sync
16 points DI/PI
Ready
External sync
16 points DO
Ready
External sync
16 points DO
Ready
Integrated digital I/O feature
Group 0
DI
data
reg
Channel
Ext sync interrupt ——————-
PI
data
reg
~
Process interrupt ————————>>
»
Group 1
—
pee
cme
ee
een
ee
eee
eee
S77
DI
data
reg
Ext sync interrupt ——————+> |
“
PI
data
reg
Process interrupt —-—————_—
Group 2
has
DO
data
reg
>)
Ext sync interrupt ——————>
Group 3
A
———-
amine
ee
DO
data
reg
Ext sync interrupt ——————>
Figure 5-1. Digital I/O feature—simplified data flow
5-2. GA34-0033
——