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In this video, I will show you how I complete the keypad by mounting it on a PCB and fitting it inside a case. To interface the keypad with the trainer board, I will be using another 74HC244 buffer chip. Additionally, I will add a 74HC138 to provide input address decoding, allowing us to distinguish between the onboard tactile switches and the external keypad.
I will walk you through the hardware circuit and the Z80 assembler program that I wrote to make the keypad work. You'll get a detailed understanding of how everything works together to make the project functional.
To conclude, I will demonstrate the keypad in operation, so you can see how all the components work together seamlessly. If you're interested in following along, you can find the schematics on my GitHub page at github.com/sra....