IBM Infoprint 6500-v05 Maintenance Manual page 528

RRP Right Ribbon Guide
RSP Ribbon and Shuttle Processor
RST Reset
RTPU Real-Time Processing Unit
RTS Request to Send
RXD Receive Data
SCS SNA Character Stream
SDRAM Synchronous Dynamic Random Access Memory
SEC Security (Key)
SEL Select
SEN Sense, Sensor
SF Structured Field
SG Signal Ground
SHH Shuttle Hall (Effect)
SHM Shuttle Motor
SHUT Shuttle
SHUTL Shuttle
SIMM Single Inline Memory Module
SLCT Select (Online)
Slew Rapid vertical paper movement
SMD Shuttle Motor Drive
SNA Systems Network Architecture
SOFT Software
SPU Shuttle Processor Unit
SPX Software Program Exchange module
SRAM Static Random Access Memory
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