IBM Series 1 User Manual page 66

"0
H
0
(')
(1)
Ul
en
0
t"'l
1-4
"-
0
(')
::r'
PI
:::J
I:'
(t)
~
t\.)
i
U1
~
o
+ Clock CS
request
+ Enabled CS
request
+ Clock
interrupt
request
+ Enabled
interrupt
request
+ Interrupt
level
compare
+ Poll
+ Poll prime
- Channel resets
+ Service gate
return
- Service gate
capture
\
I
\
/
\
.I
'\
)
'\
,/
\
j
'\
)
'\.
.I
'\
)
t
Clock
Data
----I::::::.
Reset
t
Clock
Data
~
Reset
t-....
Sample
latch
~
'"
Inverter
r - -
Sample
latch
AND
Key:
CD
Device interface with channel
(1)
Jumper connection
AND
inverter
o
Off-page connection to another figure
h =
Negative active signal
t
Positive shift required
Note: This circuit applies only to devices that do not overlap cycle steal and interrupts.
(')
.----
~
c
Poll decision
"12
.....
A
+ No request
Q
N
Data
AND
r--~
D
\Q
+
Poll
c:
1"1
propagate
(l)
r----
Polarity
hold
I\J
I
Hold
- '
Qr--..
Reset
(l)
AND
~.--
inverter
- Poll return
"0
0
.....
~
Poll capture
IS
ct>
L - - -
A
N
Set
D
Flip
(')
::::r
PI
t::I
f---- latch
.....
I - - -
b
OR Reset
Qt--.-
.J
h
en
ill
I
- Poll capture
I
,....
III
r1'
(')
I
~
tr
(0
til
h
b,.
OR
~------j
- Block
requests in
Inverter
'"
'"
r -
ample latch
,---
I
I~
tl
4
+ Clock
- - l
I
+
Data
- Reset
L - _ _ _ _ _
---.-J