.004"? That's less than half the diameter of wire-wrap wire. It sounds fragile. What did you have in mind doing with it?

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Use it in places where ribbon cable would be impractical for point to point soldering(connecting 4 ram modules in parallel) or for some lines like r/w or phi2. I can always protect it with epoxy.

I used that kind of wire on the board in the third picture at http://wilsonminesco.com/6502primer/WireWrap.html:



but I wouldn't do it again. It was too easy to break wires after they were soldered, while trying to access points to solder additional ones. If you're not making a printed circuit board, I would strongly recommend wire-wrap for digital circuits. Besides being less fragile, WW lets you get the wires shorter and straighter, improving performance.

There is a type of circuit boards made with the enameled wire though, by machine, then the wires are varnished down to the surface of the board. I can't remember what it's called to look up a picture to post.

_________________
http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

I know that ww is superior, i saw a ww diy demo cpu on my computer architecture class last year, it was old, made by students who knows when, and it still woks. WW sockets are expensive so i won't be doing any ww until i find a way to earn some money.

Verowire is 34AWG, 0.15mm - it's popular and effective if you want to avoid the expense of wire wrap.
See here.
Unbranded materials are also available, and cheaper. See this post for "roadrunner".
Cheers
Ed

It is thicker than the one i currently have, but in my case could there be any ac consequences from using such a thin wire(in our hi frequency sbc enviroment).

There are PCB traces with that width and even less thickness (.0014" for 1-ounce copper), so I think you'll be fine as long as you put the IC shoulder to shoulder (for short connections) and keep the wires fairly straight. Going really small affects the resistance a lot more than the inductance, and in this case mostly because of the skin effect, but it will be fine if none of your connections are more than a few inches long. Dr. Howard Johnson's articles on skin effect in high-speed digital designs are indexed at https://web.archive.org/web/20120302190 ... n%20effect .

_________________
http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

Ok. Then i can use it to connect multiple rams in parallel, since using ribbon cable for that kind of thing gets really tedious and ugly.

(Garth: thanks for saying "a few inches" - it looks a great deal better to me to see quantified advice, where often we see advice like "as short as possible" which isn't much help to someone who doesn't already have the experience to judge what it means. Even vague quantification is better than none! Cheers.)

It still felt very vague, but there are so many variables that one cannot give a solid answer. What rise times? What loads? What frequencies? How much do you have to build, which relates to how short the connections can reasonably be made? What future expansion might there be? And from there you can start doing some heavy-ish math, and then we're often brought back full circle to "Just try it and see if it works reliably, and see how fast it'll go," and if it's not good enough, you start over, doing something better. Sometimes you have to be like a beaver building a dam, or a bird building a mud nest under the eaves, which have no concept of math, but a good feel for what's needed, and they do a great job.

_________________
http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

Sure, vague isn't definitive, and behind a judgement there might be a lot of specific knowledge, but for advice to be useful it has to be actionable, and "keep your connections down to a few inches, and see how you get on" is certainly actionable.
Cheers
Ed

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

You can use alternate conductors in the ribbon cable for signals or ground.

BTW the Beeb's second processor is connected by (short) ribbon cable. As are many disk drives.

_________________
x86?  We ain't got no x86.  We don't NEED no stinking x86!