Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

On Fri, 18 Mar 2016 13:36:03 -0700, you wrote:

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>Anyway, I know I could get away with being inexact here. But the point of the exercise is to get as close to original as possible, which is why I went to the trouble of getting 1973 vintage chips. I’d also like to duplicate the process a hobbyist of that day would have used also, for my own education and experience. The experience is a big part of this. I want to be able to do what the museum can’t/won’t, let people see and use and get the feel for the thing. The museum will never show the most important part of the TVT, the boards, but I can with mine. And because I can I will, and I guess for that reason I want them to look right.
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Then a suggestion I'd have would be to go do what you want, but be
reasonable about the definition of "as reasonable". I think that the
comment about the different variations having possibly different color
boards is realistic, although I don't remember any SWTP product that I
saw having paper boards (although there were a lot out there).

NEXT: I'd design the same thing using modern technology, and build
one of them. That would give people a unique idea of just how far
technology has come in about 50 years. (note: feel free to embellish,
but have the basic mode be exactly what the original did).


I seem to remember a 68045 chip that was designed to be a similar
style of display.


Harvey


>From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
>Sent: Friday, March 18, 2016 10:35 AM
>To: Homebrew PCBs <Homebrew_PCBs@yahoogroups.com>
>Subject: Re: [Homebrew_PCBs] TV Typewriter: Custom G10 copper clad
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>Yeah
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> And besides, there are scant few folks around in hobby electronics nowadays that have ever actually
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>laid eyes on a finished (or unfinished) Lancaster TV Typewriter. It is totally obsolete by todays standards and state
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>of the art.
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>And, as Lancaster envisioned, the thing was to be enclosed in a kind of wooden desk-top enclosure, so
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>nobody sees the circuit boards anyway.
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>Too bad that a search can't somehow be made on the internet, inquiring if there is some
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>"old-timer" (like me) that has a Lancaster TV Typewriter in a dusty pile of forgotten projects,
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>and that way, you could get the "real" item and bring it back online.
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>These are just suggestions.........now, don't everbody jump on me with snide remarks.
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>Regards.
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>Roland F. Harriston, P.D.
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>∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗
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> _____
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>From: "Stefan Trethan stefan_trethan@... [Homebrew_PCBs]" <Homebrew_PCBs@yahoogroups.com>
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>Snip:
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>Most people are going to look at you as if you are crazy for wanting a specific colour and weave of material. That is because you are crazy of course, and nothing to worry about.
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>It will not help your quest at all, but consider buying double sided laminate (with copper on both sides). I found it much easier to obtain and just etch one side away completely for single sided boards. Of course it makes impossible to see the inside.
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>Also mind that in any case the copper on the other side will severely change the colour you see, even if the seller provides a photo of the board side. The copper layer is actually a dark red underneath, completely different colour from the shiny top surface.
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>ST
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