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Thread: PC 5170 need help with PAL16L8 and 28S42

  1. #21
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    That's an annoying thing about the blog section--there is apparently no way for one to remove entries made in error--mostly by clicking the "blog this post" instead of the "reply to thread" right below it. I don't really understand why the "blog this post" button is there to begin with.
    Last edited by Chuck(G); August 23rd, 2019 at 09:25 AM.

  2. #22
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    Quote Originally Posted by Dwight Elvey View Post
    Nice but what about 3state outputs?
    Dwight
    I address this in the later parts of the blog. I employ a little trick to gently "push" on outputs to determine if they're tristate. If I gave more thought to this in retrospect, I could have worked the "push" logic with just a single output. In other words, run the exhaustive test of combinations with and without the "push" and compare the results.

    However, I've had no need to clone PALs in quite a few years, so this has dropped off the radar for me.

  3. #23

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    Quote Originally Posted by Chuck(G) View Post
    I address this in the later parts of the blog. I employ a little trick to gently "push" on outputs to determine if they're tristate. If I gave more thought to this in retrospect, I could have worked the "push" logic with just a single output. In other words, run the exhaustive test of combinations with and without the "push" and compare the results.

    However, I've had no need to clone PALs in quite a few years, so this has dropped off the radar for me.
    I guess I got tired of pushing next. Most applications don't use the 3state anyway. They are usually just address decoders.
    Dwight

  4. #24

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    So nobody has made copies of the PAL's on the 5170? I'd sure like copies to burn if they have so I can have them on hand if needed. Best I can tell there are 3 of these on the 5170 type 1 board.

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