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Update after long time, real hardware.

A project log for JACA 1 & 2 Homebrew Computer

JACA - Just Another CPU Again Homebrew CPU, starting by a simple POC 4-bit CPU on circuit simulator soft. (done), then 8-bit (in progress)

andre-baptistaAndre Baptista 08/06/2017 at 18:100 Comments

Hello, first log entry in a long time... Trying to keep the project up while solving personal issues.

Finally I have something "real" to show:

I'm yet to receive many parts (thanks to the brazillian mail), but I could make the clock, and the 74HCT4017 to make the 4 cycles steps (Fetch 1 to 3, the red leds, and Execute, the yellow one).

It's a very small step, but I need to break the inertia.

Working with real hardware has it's peculiarities, It's very important to follow one of the XP principles, baby steps...

Between the lessons learned, never, NEVER keep inputs floting, the circuit behavior becomes imprevisible.

Thank you for reading.

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