Front Panels - PDP8 and PDP 11
rodsmallwood52 at btinternet.com
Wed Mar 9 17:14:22 CST 2016
Our cam was fitted with a high grade Ziess lens that cost a fortune
On 09/03/2016 18:03, COURYHOUSE at aol.com wrote:
> ""The cameras (they were huge) and the darkend rooms they worked
> in no longer exist.""
> These cameras you speak of were wonderful.... I rode a Robetson for
> part of a summer making halftones and line shots for a print shop in AZ
> here. In my off time I was allowed to shoot all the old docs and old
> Eastman Kodak camera catalogs I wanted to and print them up as
> posters! The lens was a Goerz Red Dot Artar and the sharpest flat field lens
> I had ever used!!
> Back to computer panels.... Rod thanks for doing the work to create
> ed# _www.smecc.org_ (http://www.smecc.org)
> In a message dated 3/2/2016 3:32:48 P.M. US Mountain Standard Time,
> rodsmallwood52 at btinternet.com writes:
> Hi Guys
> Having got 8/e (A & B) plus 8/f and 8/m into
> production its time I made a few comments.
> The aim has always been to reproduce the original panels using the
> process DEC used all those years ago.
> Needless to say we had to go through the learning curve with only
> photographs, scans and one 8/m original
> panel to go on.
> In the interests of origiality I have kept what we used call 'features'
> as found in the documentation and the sample we had.
> I'm trying to reproduce the original, not produce an improved or fixed
> The only process deviations I have allowed myself are as follows:
> 1. The original versions would have been drawn twice full size by
> hand on matt paper in indian ink.
> One sheet per colo(u)r would have been requred. They would
> then have used a process camera
> to reduce to one to one positive masters on clear acetate film.
> The cameras (they were huge) and the darkend rooms they worked
> in no longer exist.
> I used to do just that in the early '70's but whats weird is
> where I worked is less than 50 yards
> from the silk screen studio doing the work now.
> Now I use Inkscape and its layers to do the same thing. The
> screeners have an Epson printer
> the size of a piano to print my layers in black onto clear
> film. After that the process is the same as it was.
> They take a fine meshed cloth streched onto a frame. Its
> coated (by hand) with a photo sensitive
> emulsion, when dry it gets exposed through the master using
> a UV light source.
> The the parts proteced by black on the master are water
> soluable and get washed out and hence
> let the ink through. So one screen per layer is required
> 2. DEC would have printed the images first and routed or milled the
> holes using some kind jig later.
> As long as the hole stayed inside the white line that was
> deemed to be OK.
> We drill (laser cut) first and screen afterwards.
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