RAM, --> 
RAMEX, 321 
Reboot, 223-224 
Refresh, 20 
Reset, 223 
Resolution - setting, 49 
RF Modulator, 260 
RF Monitor, 320 
RGB - analog, 260 ,digital, 260 
RGB Video, 7 , 49 , 63 , 64 
ROM, 1 , 6 , 223 , 253 
RS-232, 6 , 255 
RS-232 and MIDI, 318 

Sampling - period, 141 ,rate, 152 
Scrolling, --> 
SCSI Disk Port, 321 
SCSI internal disk - pins, 336 
SERDAT, 258 , 259 
SERDATR, 256 
Serial, 9 
Serial Port, --> 
Serial Shift Register, --> 
SERPER, 255 
SET/CLR, 35 , 144 , 145 , 218 , 222 , 249 , 257 
Shifting - blitter, 182 
SKIP, 20 
Slow Memory, 5 
Sound generation, 134 
SPREN, 222 
Sprite, 3 , 9 , 19-20 
Sprite Colors, 27 
Sprite DMA, 27 
Sprites, --> 
SPRxCTL, 107 , 123 , 124 , 126 , 128-129 , 298 , 303 
SPRxDATA, 123 , 126 , 129 
SPRxDATB, 123 , 126 , 129 
SPRxPOS, 107 , 123 , 124 , 126 , 127-128 , 129 , 303 
SPRxPT, 114 
SPRxPTH, 110 , 126 , 127 
SPRxPTL, 110 , 126 , 127 
SRCA, 170 
SRCB, 170 
SRCD, 170 
Stereo, 4 
STRLONG, 298 
System Clock, 2 
System Control Hardware, 9