Statement: Interface an 8 x 8 matrix keyboard to 8085 through 8279 in 2-key lockout mode and write an assembly language program to read keycode of the pressed key. The external clock frequency is 2MHz. Use I/O mapped I/O technique. (Dont use any Interrupts)
HARDWARE FOR 8 x 8 MATRIX KEYBOARD INTERFACE
SOFTWARE FOR 8 x 8 MATRIX KEYBOARD INTERFACE
The three steps needed to write the software are:
Step 1: Find keyboard/display command word.
Step 2: Find program clock command word
Step 3: Find Read FIFO/sensor RAM command word.
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