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Interfacing the ISA Bus
by
Bart Hrvatin and Tom Sherman
Advisor: Dr. Donald Schertz

The ISA (Industry Standard Architecture) bus was introduced by IBM in 1986 in the PC/AT and has been used in every IBM compatible since. Essentially every board interfaced to the PC must do so through the ISA bus. Without the means to interface the microprocessor with an external board the PC would be limited in its applications. In this project a 16-bit ISA board with two serial and two parallel ports and two timers, using both Intel and Motorola integrated circuits, was designed and constructed. The devices are memory mapped, allowing them to act like regular memory components. The software controlling the devices is developed using C-language, allowing the system to recognize the devices at their specified memory locations for simplified operation. The testing of the devices is accomplished by looping data in series and parallel form at varying rates.
 

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