23 Oct
2007
23 Oct
'07
7:52 a.m.
Ahh. I meant that I thought all PC-type machines
*with a parallel
port* present it to the system as though it were an ISA-connected
port (as in the original PC) and *not* a high-speed I/O port running
at close to the system's main bus speed - i.e. using a new machine
with a parallel port doesn't give you any speed advantage over using
a machine from ten years ago with a parallel port.
I don't see how the one follows from the other. Just because its
CPU-facing interface looks like an ISA bus's doesn't necessarily mean
that there is anywhere, even internal to some chip, that actually has
ISA bus signals - and, in particular, it doesn't necessarily mean that
anything limits its speed to ISA bus speeds.
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