Analog Input Card
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This 8-bit analogue input card is effectively a PC joystick expansion card. The four joystick analog inputs are implemented using a pair of 555 timers. The timer is started by a read from the CPU which then polls the card until it signals the timer has expired. The delay depends on the value of the analogue input and the values of the Rc network attached to the 555 chip. Date : UnknownFormat : Expansion Board Physical Description : Expansion board This exhibit has a reference ID of CH42248. Please quote this reference ID in any communication with the Centre for Computing History. |
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