Joined: Fri Aug 30, 2002 1:09 am
Posts: 8546
Location: Southern California
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When I see those old boards, they remind me of my first board layouts for production. Before we had CAD (or even any computer beyond an Apple II in the company), we would lay out a board on paper, with pencil (colored pencils for multiple layers), two or four times actual size, then put the stable-based transparent film over it, and tape it using black crepe tapes of different widths for traces and the IC patters which were rub-on or stick-on—I can't remember for sure. The crepe tape had a gazillion tiny wrinkles in it so you could do the curves—and pretty tight ones too. There was a separate film for each layer, and one as a pad master so you didn't have to tape the pads on every layer. The pad master was also used for soldermask. Then we had to drive the films to the graphic-arts house to have them reduced to actual size, then send those to the board house. When I heard about using CAD and sending the result by modem to the board house's BBS (this was before the internet), it all sounded too easy.
Edit, 2022: I found the last board I taped, in 1993, at home for a job on the side, just before I got my own CAD:
Attachment:
MacsBusThingTop.jpg [ 226.29 KiB | Viewed 252 times ]
Attachment:
MacsBusThingBack.jpg [ 197.72 KiB | Viewed 252 times ]
I think I threw out my box of crepe tapes and IC patterns and stuff just a couple of years ago, after not having touched it in over 25 years.
_________________ 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?
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