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AB Register

A project log for 8 Bit Breadboard CPU

A home-brew 8 bit Microprocessor built on a breadboard 64K Address Space, IRQ, and DMA 16 Bit Stack Pointer, 4 8 bit Registers or 2 16 bit

2-Zons2-Zons 01/15/2019 at 21:141 Comment

Finished the AB register.  It's the same as the XY register minus 16 bit in and out to address bus.  I'm getting much better at the wiring.  For previous modules I would wire up just enough that I could test it, and then add  a bit at a time testing as I went.  This time I wired up the entire thing before testing, and only had one mistake when I fired it up (two bits crossed over on A).  It was a quick to spot and quick to fix.  My productivity should go up now.  I've also received all of my orders so I have everything I need to complete the entire system.  I dug up my label maker to tag the control lines.

I'm getting enough modules complete to start wiring them all together.  I can better judge now how many boards it will take for the whole system.   I wish I could buy the power rails separately.  I will be needing quite a few for data and address bus.

Discussions

morgan wrote 01/16/2019 at 19:56 point

Super cool! You are just cranking out modules. Cannot wait to build my own.

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