IBM System/36 Maintenance Information Manual page 146

M. 1 048 576, when making reference to a quantity
of data or data storage. See also megabyte.
MAP. Maintenance analysis procedure.
Mb. ,1 048 576 bytes. (Mb may also be displayed
as MB.) See also megabyte.
megabyte. 1 000 000 bytes, when making reference
specifically to the storage size of a disk storage
device. See also M and Mb.
MIM. Maintenance information manual.
MLCA. Multiline communications
attachment/adapter.
modifier. Something that modifies or changes.
modify. To change something. Same as alter.
MPTF. Microprogram temporary fix.
MS. Main storage.
MSP. Main storage processor.
multidevice. More than one device.
multiline. More than one communications line.
multinational. More than one country.
multiple. More than one.
multipoint. In data communications, a network that
has more than one station.
~C. Overcurrent.
occupied. Busy. See also DLO.
OV. Overvoltage.
overcurrent. A condition that occurs when power
supply current is too high.
overview. A summary.
overvoltage. A condition that occurs when power
supply voltage is too high.
panel. See I/O panel and control panel.
PEB. Processor error byte.
D-4
5363 Maintenance Information
PND. Present next digit.
POR. Power-on reset.
problem determination. The process of identifying
why the system is not working. Often this process
identifies programs, hardware, data
communications equipment, or user errors as the
source of the problem.
program temporary fix. A temporary solution,or
bypass of a problem diagnosed by IBM service
representatives as a result of a defect in an existing
program. See also authorized program analysis
report (AP AR).
protocol. In SNA, the rules for transmitting and
receiving data.
PTF. Program temporary fix.
PUMP. Pack utility maintenance program.
R/W. Read/write.
RDS. Receive data space.
reflection. Part of a signal that returns to its source
because of a change in the impedance of the cable
in which the signal travels.
reload. To load programs again (as from diskettes).
RETAIN. Remote technical assistance information
network.
retainer. a device used to prevent logic cards and
cables from becoming loose.
retry. An attempt to perform an operation a
specified number of times, or until the operation is
completed. See also AeR.
RFI. Radio frequency interference.
RNR. Receive not ready.
ROS. Read-only storage.
RPQ. Request for price quotation.
RS-232-C. An EIA intl;:rface specification.
RTR. Ready to receive.