IBM Series 1 User Manual page 88

c
o
DPe
command logic (for detecting a write sequence), and
service gate capture logic.
IPL logic, to the extent that the attachment should
have the ability to hold the state of the "enable IPL cycle
steal requests and transfers
l1
pending device response,
should be located on that portion of the attachment that
plugs into and derives power from the I/O socket.
Otherwise, this
may
preclude the capability of the device to
execute a processor-initiated IPL in auto IPL mode.
Stu~ 1~ngth2.
Stub lengths to I/O channel drivers and
receivers should be held to
~
inches J!!.axiJ!J!.!!.Tag inputs
and outputs, and request in lines should favor shorter
lengths.
Si.91!g! ClamEing. All I/O channel circuit modules should
have clamping for negative excursions of the signal input.
!;ir,£ui,! f'!odulg Voltage Tolerances. Circuit modules used in
device attachments that utilize voltages from IBM supplies
must be capable of operating with ±10 percent tolerances
from nominal as seen at the module pins.
Ci£,£ui1 Module
Ov~ltaSl~.
an overvoltage rating for
nominal.
All circuit modules
voltage supplied
must have
of 401 over
Processor I/O Channel 2-73