TTL based 4-bit CPU
I've wanted to make and understand CPU from its root. This time I made a "duplicate" CPU made of TTL, introduced in a Japanese book "CPUの創り方" ISBN4-8399-0986-5. ROM in this book is made of bunch of DIP switch and diode, and I don't want to make "switch and diode paradise" circuit and ROM, where program stored, is emulated by Arduino. Details can be found at https://hackaday.io/project/8442-ttl-... Have fun!
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