[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] OEMs      vs. retail-boxed components  off-line power supplies  Office PC 99  OmniKey keyboards  on-line UPS  OnStream tape drives  OpenGL  operating system certification  operating systems      distribution disks for      expansion cards and      memory and  2nd      SMP support for  optical discs  optical drives, installing  optical mice  optical phase change technology  Orange Book (CD formats)  orphaned drives  OSTA standards  out-of-order core  output waveform  overburning      caution with  2nd  overclocking CPU speeds  2nd  overcurrent/overvoltage protection  2nd  overload protection on backup power supplies