12. Windows-only printers
As I discussed earlier, some printers are inherently unsupported
because they don't speak a normal printer language, instead using
the computer's CPU to render a bitmap which is then piped to the
printer at a fixed speed. In a few cases, these printers also
speak something normal like PCL, but often they do not. In some
(really low-end) cases, the printer doesn't even use a normal
parallel connection but relies on the vendor's driver to emulate
what should be hardware behavior (most importantly flow control).
In any case, there are a few possible workarounds if you find
yourself stuck with such a lemon.