By J. R. Ashworth (auth.), J. R. Ashworth (eds.)

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In practice, a calibration should be carried out which involves measurements of the one-shot period when the input resistance is zero and when the input resistance is precisely 100 k•. 30 PC INTERFACING CENTRONIC, RS232 AND GAME PORTS Some game port adaptors on computers only support joystick A. In this case, only two resistance channels and two digital input channels are available. 3 Software control In the QBASIC programming language, there are two instructions which are specific to the game port.

This enables users to trace the effect of I/O operations. Each I/O line has a detachable screw terminal from which user's experimental circuits can be connected. All the digital lines fed into the computer are buffered by Schmitt trigger buffers. All the boards require a single rail 8-15V unregulated DC power supply. The on-board 7805 ÷5V 1A voltage regulator converts the input voltage to ÷5 V. The current of the regulated power supply is limited by a 1A on-board fuse. The boards use popular electronic components and are constructed on single sided PCB boards.

All interfacing experiments described in this book are carried out using three experimental boards, namely the Centronic experimental board, the RS232 experimental board and the game port experimental board. 5 gives the hardware details of the boards. The circuit-making tools are used to construct experimental circuits. They include breadboards, stripe boards and printed circuit boards. 1 DC power supply An 8-15V 1A DC power supply is required by the three interfacing boards. Any DC power supplies having a suitable output voltage range and a current rating can be used.

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