Interfacing the ISA Bus
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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