
GLOSSARY
GLOSSARY-34
XEROX 4635 LASER PRINTING SYSTEM MESSAGE GUIDE
MIS
management information systems
MPU
microprocessor unit
MTU
magnetic tape unit (refers to the 9-track magnetic tape drive; also
referred to as “magnetic tape drive”)
OCR
optical character recognition
OCS
operator communications subsystem
OLI
online interface
OS
operating system
OSDS
operating system diagnostic software
OSEXEC
operating system executive
OSS
operating system software
PC
personal computer
PCC
printer carriage control
PC UI
personal computer user interface
PDL
print description language
PE
phase encoded
ppm
pages per minute
PQA
print quality adjustment
PROM
programmable read-only memory
PSC
printer subsystem controller
pt
point
PWBA
printed wiring board assembly
QIC
1/4 inch cartridge