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  • Author Author: timswift
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The Complete 8 Bit ALU

timswift

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I finished the ALU (all 8 bits) and the test-board yesterday. It contains 355 transistors without the test board.

In all it took less then two days to construct and trouble-shoot (not including the small boards).

It is interesting to note that the ALU only had one short while the test board had two LED's soldered in backwards and a short.

 

The back side of the ALU;

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The 34 pin connector is wired as below;

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The six functions are not encoded so if more then one is selected at a time the functions are calculated and the the results are OR'd together

(I don't think this property has a practical use).

 

Here is the test-board (just light's and switches);

 

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And finely the block diagram;

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Tim

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  • BIt (no pun intended!) confused.
    Trust me, I'm really not being insulting, nor belittling your achievement, BUT:
    Y'know, when I read things like Enid Blyton some 50 years ago, I always thought a story had a beginning, middle, and an ending.
    The Beginning: Why? What's the purpose/goal? Objective?
    The Middle: Design principles, reason for components chosen? Interface to what? (Even a bunch of LED's?)

    The End: What I learned, what I'd change, why I didn't just buy a 74LS181 from Farnell?
    Good effort in engineering. Yeah, I'm and old git, and I'd probably still make it with a hundred (Russian) ECC83's....

    -Andy (making Wireless Sets before Marconi was a twinkle in his Grandfather's eye...) JOKE!

Comment

  • BIt (no pun intended!) confused.
    Trust me, I'm really not being insulting, nor belittling your achievement, BUT:
    Y'know, when I read things like Enid Blyton some 50 years ago, I always thought a story had a beginning, middle, and an ending.
    The Beginning: Why? What's the purpose/goal? Objective?
    The Middle: Design principles, reason for components chosen? Interface to what? (Even a bunch of LED's?)

    The End: What I learned, what I'd change, why I didn't just buy a 74LS181 from Farnell?
    Good effort in engineering. Yeah, I'm and old git, and I'd probably still make it with a hundred (Russian) ECC83's....

    -Andy (making Wireless Sets before Marconi was a twinkle in his Grandfather's eye...) JOKE!

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