Re: Interview Question (your Sunday ruined part 2)

On Sun, 27 Oct 2024 07:53:07 +0000, liz@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:

fdBill Sloman <bill.sloman@ieee.org> wrote:
>
[...]

So somebody has made a grade of paper that works as well as the Mylar
drafting film that I used back in the days when we still drew circuit
diagram with pencils on a drawing board.

>
I wonder if anyone else has experienced the 'Looking Glass' phenomenon
which I used to get?
>
I often had to lay out a printed circuit board on translucent paper and
work from either side.  After working for a few days on the mirror-image
side, with all the text reversed, I found it became so natural that
returning to the right-way-around World was very difficult.  That
transition was far more difficult than adapting to the
looking-glass-World had been in the first place.

We used to design on a sheet of frosty mylar with colored pencils to
show the layers.

The real layout was done with stick-on black stuff on a stack of clear
mylar, one padmaster and one sheet for each layer of traces. The
mylars were ultimately stacked and processed to film, which we sent
top the PCB houses and demanded back.

There was a guy in sillicon valley, Lorry Ray, who was a genius at
making the film from our mylars.

Resoution was terrible. It was borderline possible to get two traces
between the pads of a DIP package.

All that was horribly slow and expensive.

I still have a couple of mylar stacks around to show to the kids.

>
I attribute it to being left-handed (and have also noticed that I dream
left-right reversed).

When I was younger, I could easily read and write backwards.

I see a lot of photos on the web, in news reports and such, that are
obviously left-right flipped.