IBM Series 1 User Manual page 45

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Service ga te
Address bus 00-15
Condition code in
bus (address key)
Cycle byte indicator
Cycle input indicator
(input)
Data bus (input)
Service gate return
Status bus
Data bus (output)
Data strobe
Timings:
a
< T1 < T2 < 3 p.s
a
~
T3
~
T4
~
3 p.s
100 ns < CT1
0< CT2 < CT1
200 ns < CT3
100 ns < CT4 < CT3
+
100 ns
a
~
CT5 (burst only)
(j
CT2
•
CT3 _
_ _ _ _ ~CT~l _ _ ~1
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' - - - - - - - -
Legend:
CT
=
channel times
T
=
attachment controlled times
LVS -= last valid signal, occurring in time, of a group of
signals being activated on the channel. The group
is linked by short dotted lines on the timing diagram.
LIS = last invalid signal, occurring in time, of a group of
signals being deactivated on the channel. The group
is linked by short dotted lines on the timing diagram.
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