5 Jul
2010
5 Jul
'10
6:28 a.m.
From: csquared3 at tx.rr.com
Hi
That is the point. He needs a host controller to talk to the printer.
A parallel input is to receive data from the old PC.
On another thought. If you can find an older laptop ( I'm typing
on a Dell D800 right now ), they come with both USB and a parallel
port. One should be able to write something to read the parallel
port and then send it out the USB. Not a real clean setup
but something that should work.
Dwight
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My guess is the hardware is little more than a microcontroller, amybe
with a bit of logic to ensure the handshake timing is correct (a D-type
and a couple of gates). The software is another matter, though...
I've not
personally done it so please take this as semi-informed
speculation, but I think it would be not too hard based on some things
I've been reading in Nuts & Volts and Circuit Cellar. Some of the PIC
CPUs have USB capability now and there is evidently some pretty nice
support software in their library. If you didn't want to use one of
those, then FTDI has some nifty chips with a lot of the USB logic built
in. If I correctly understand what you're wanting to do then you just
need a USB client and not a USB host which makes the problem a lot
easier. If you can also arrange to have the USB client emulate a human
interface device then you avoid needing any sort of driver in the PC.