In many instances you may not need to have a full set of multimedia speakers on your PC such as in an office environment. With this internal speaker installed you can still hear the PC boots codes as it boots to be sure everything is working correctly. You can also hear the confirmation beeps when you insert USB devices.1 short: boot normal1 short 1 short 1 short: initialization system power failure1 short 1 short 2 short: motherboard error1 short 1 short 3 short: CMOS battery failure or 1 short 1 short 4 short: ROM BIOS checksum error1 short 2 short 1 short: System clock error1 short 2 short 2 short: DMA initialization failure1 short 2 short 3 short: DMA page register error1 short 3 short 1 short: RAM refresh error1 short 3 short 2 short: Basic memory error1 Short 3 Short 3 short: Basic memory error1 Short 4 Short 1 Short: basic memory address line error1 Short 4 Short 2 Short: basic memory parity error1 Short 4 Short 3 Short: EISA timing error1 Short 4 Short 4 Short: EISA NMI port error2 short 1 short 1 short: before the 64K base memory error3 short 1 short 1 short: DMA register error3 Short 1 Short 2 Short: Master DMA register error3 short 1 short 3 short: main interrupt handling register error3 short 1 short 4 short: slave interrupt handling register error3 short 2 short 4 short: Keyboard controller error3 short 1 short 3 short: main interrupt handling error register3 short 4 short 2 short: display error3 short 4 short 3 short: clock error4 Short 2 Short 2 Short: shutdown error4 short 2 short 3 short: Gate A20 error4 Short 2 Short 4 Short: protected mode interrupt error