[Coco] Printing on a Coco with modern printers.

[Gene Heskett]

On Saturday 11 January 2014 15:35:10 Joel Ewy did opine:

> On 01/11/2014 02:07 PM, Mark J. Blair wrote:
> > On Jan 11, 2014, at 11:46 , Gene Heskett <gheskett at wdtv.com> wrote:
> >> Frosting on the cake then. But how do they represent the real?
> > 
> > Postscript is a complete programming language, designed for the
> > primary purpose of describing vector graphics. When you print to a
> > Postscript printer, you send the printer a Postscript program which
> > describes what you want to be printed. The printer executes that
> > program, and renders its output in whatever native resolution the
> > printer uses. The Postscript code is plain old ASCII text, and
> > numbers are represented just like you would in most computer
> > programming languages, i.e. "1.23456".
> > 
> > Postscript is stack-based and uses postfix notation (hence, the name).
> > 
> > Here's an example from the Wikipedia page which prints "Hello world!"
> > at 1 inch (72 points) from the left edge, and 6.944 inches (500
> > points) from the bottom edge:
> > 
> > ------ 8< cut here 8< ------
> > %!PS
> > /Courier             % name the desired font
> > 20 selectfont        % choose the size in points and establish
> > 
> >                       % the font as the current one
> > 
> > 72 500 moveto        % position the current point at
> > 
> >                       % coordinates 72, 500 (the origin is at the
> >                       % lower-left corner of the page)
> > 
> > (Hello world!) show  % stroke the text in parentheses
> > showpage             % print all on the page
> > ------ 8< cut here 8< ------
> > 
> > 
> > The coordinates are in units of 1/72 of an inch, but they don't have
> > to be integers. For example, line with the coordinates could have
> > stated "72.12345 499.5 moveto" and the text would be rendered at
> > those coordinates, limited by the native resolution of the printer.
> > 
> > Postscript code is most commonly machine-generated, but you can also
> > write native Postscript code if that floats your boat.
> 
> Anyone else remember how Don Lancaster used to fill column after column
> in Radio-Electronics magazine raving about all the cool things he could
> do with Postscript on his LaserWriter hooked up to his Apple 2.  His
> favorite saying was something about how PS was a general purpose
> programming language that just happened to be good at putting marks all
> over otherwise blank sheets of paper.

Now that brings back some old memories, very old ones.
> 
> JCE
> 
> 
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Cheers, Gene
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