IBM Series 1 User Manual page 185

I/O active
Function bits
Modifier bi ts
Device address
Data bus out
Interrupt service
active
strohe
Data bus in
Interrupt request
condition code in
Select response
Halt or machine
check
System
reset
Power-on reset
Diagnostic mode
Diagnostic mode
modifier
Direction
~daE!~£Lg~!£~l
--------)
--------)
-------->
--------->
-------->
------_._>
--_._---->
(--------
(--------
<--------
(--------
--.-.----- >
-------->
-------->
-------->
-------->
All signal lines are down-level active.
*When parity option is not selected.
l!~-21 li~§
1
J
4
4
18
(16)
*
1
1
18
(16)
*
16
3
1
1
1
1
1
1
The DPe adapter signal lines are defined in the following
sections:
ILQ
AC!i.!~
I/O active is an outbound tag to signal to an I/O device
that it may begin execution of the command specified by the
function and modifier bits. This tag is necessary to
execute all device directed commands. It is active at least
200 nanoseconds after activation of
~he
function, modifier,
and device address bits.
6-4 GA34-0033
(
-
"
~
F
(
,
,
,