Quoting Steve Litt ([email protected]):

[PS support]

> You might pay $1000 instead of $400, or $2000 instead of $1000.

One, ISTR you exaggerate.

Two, most of the reasons why PS-supporting printers are slightly (not
greatly) more expensive than non-PS-capable printers reflect being aimed
above the rock-bottom of the market and comprised of good components
with reasonable capabilities (including wired networking) rather than
getting by with terrible parts, no wired networking, and the cheapest
possible choices of everything that will barely suffice to permit a
printer to work at all.

One hardware consequence of PS that is _directly_ related is printer RAM
and CPU.  If the printer must image each page from a PostScript-wrapped
bitstream, then it cannot limp by with 128kB of printer RAM but must
have around 4MB, and it cannot have a CPU not quite good enough to drive
a digital watch.  So, parts selection cannot be scrapings from bottom of
the hardware barrel such as is the case with the cheapest possible
(awful) non-PS printers.

But, anyway, if PS cost an extra $600 on a laser printer I expected to
use in production for the next ten years, me, I'd still pay that.

> Also, I *thought* all modern printers could understand and render PDF.
> Was I wrong about that?

Yes, you were.  PDF actually _is_ PostScript, just slightly transformed
and compressed for storage.
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