I'm currently working on a digital alarm clock project. Programmable ICs are not allowed. I'm planning to use only TTLs because it's all I have and all I can get. My problem is that I don't know how to force the clock to display 12:00 instead of 00:00. I also have no idea how to implement an alarm that can be set and reset, as with the time. Can anyone provide some insight? Thanks. I have my schematic attached.
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