swapped pins #1
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Hi,
So swapping those two pins will make it the same as the original board? That’s easy enough to do, and I can fix one other problem in that the silkscreen does not show component values.
Bob
… On Dec 27, 2021, at 4:40 PM, Bradley Bell ***@***.***> wrote:
I have one of the original boards (Newtech Model 68 rev. B) and I was curious about the out-of-order bits issue speculated about on Robin Grosset's video - https://youtu.be/TBFA2xbCjZ4 <https://youtu.be/TBFA2xbCjZ4>. I took a close look at my original board and the bits are definitely not out of order. The circuit does look identical to this eagle project, except that pins 2 and 7 of the 74LS174 are backwards. I am guessing that this was done inadvertently between your initial run and the cleanup for posting on github. If you would like photos of the board I can provide some.
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Do you have an original schematic? I am not sure where I picked up the schematic when doing my board but now I can’t find it on-line. Swapping pins 2 and 7 seems wrong as 2 is an input while 7 is an output.
Bob
… On Dec 27, 2021, at 4:40 PM, Bradley Bell ***@***.***> wrote:
I have one of the original boards (Newtech Model 68 rev. B) and I was curious about the out-of-order bits issue speculated about on Robin Grosset's video - https://youtu.be/TBFA2xbCjZ4 <https://youtu.be/TBFA2xbCjZ4>. I took a close look at my original board and the bits are definitely not out of order. The circuit does look identical to this eagle project, except that pins 2 and 7 of the 74LS174 are backwards. I am guessing that this was done inadvertently between your initial run and the cleanup for posting on github. If you would like photos of the board I can provide some.
—
Reply to this email directly, view it on GitHub <#1>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AJNEOG6HHGTDTEL4LTNC65DUTDMNXANCNFSM5K3AFBTA>.
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That should do it I'm pretty sure, yes. I'd really love to find some of the original demo software if you happen to have that |
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I was able to eventually find a copy of the original manual, with schematic: https://drive.google.com/file/d/1L9OZGMjd-Gc5yqgdS62v-sdTVMEDbmx2/view?usp=sharing |
I somehow didn't notice your last sentence here before. The pins 2 and 7 I am referring to are both outputs, they are Q1 and Q3 of the 74LS174. |
I have one of the original boards (Newtech Model 68 rev. B) and I was curious about the out-of-order bits issue speculated about on Robin Grosset's video - https://youtu.be/TBFA2xbCjZ4. I took a close look at my original board and the bits are definitely not out of order. The circuit does look identical to this eagle project, except that pins 2 and 7 of the 74LS174 are backwards. I am guessing that this was done inadvertently between your initial run and the cleanup for posting on github. If you would like photos of the board I can provide some.
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