RAM (Random Access Memory)
RAMDAC (Digital-to-Analog Converter)
RDRAM (Rambus Dynamic RAM)
RET (Resolution Enhancement Technology)
RFI (radio-frequency interference)
RIMM (Rambus Inline Memory Module)
RIP (Raster Image Processing)
RISC (Reduced Instruction Set Computer)
RLL (Run Length Limited)
RNG (Random Number Generator)
ROM (Read Only Memory)
ROS (raster output scanner)
RTC (Real Time Clock)
RTC/NVRAM (Real-Time Clock/Non-Volatile Memory)