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Here is a guy that makes (new) SBCs for all the old vintage
8-bitters. On most of his boards he uses a ton of 90deg traces. I
think it's his style.<br>
<br>
<a class="moz-txt-link-freetext" href="https://vintagechips.wordpress.com/">https://vintagechips.wordpress.com/</a><br>
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<br>
<br>
<div class="moz-cite-prefix">On 2/14/2020 3:47 PM, Phillip Harbison
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:a63bf61f-5a28-a3a7-5a91-4356d8158af2@xavax.com">Here's
an example of routing a bus with 4 signals. It gets much
<br>
worse with larger buses. If you're trying to weave a 16-bit bus
<br>
between the pads for RAM chips, the extra space for 90° angles
<br>
is almost prohibitive.
<br>
<br>
Regarding red/blue, I've only watched one layout guy at work.
<br>
He did red/blue with colored pencils on ordinary graph paper.
<br>
This was to plan the layout. Afterwords he created the layout
<br>
on semi-transparent (cloudy) mylar using black tape. He had a
<br>
variety of tape in various widths. This was early in my career
<br>
(maybe 1980-1983). ECAD was already taking over by 1983.
<br>
<br>
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