Abstract: A computer keyboard, mouse and VGA monitor signal transmission arrangement includes an encoder connected to a personal computer, a decoder connected to computer peripheral apparatus including a VGA monitor, a keyboard and a mouse, R.G.B VGA video signal lines and one D signal transmission signal line respectively connected between the encoder and the decoder for signal transmission, wherein horizontal synchronizing and vertical synchronizing signals are encoded and transmitted through one video signal line, keyboard and mouse signals from the personal computer are encoded and transmitted through the other video signal lines; keyboard signals and mouse signal that are to be inputted into the personal computers are transmitted through the D signal transmission signal line.