The problem you will have with any USB adapter is the 1 millisecond latency
of the USB link. It will not be possible to toggle a pin state faster than
that. That's why it's important to have real parallel and serial ports
if you do that kind of work. When I bought a laptop last year a real
serial port and a real parallel port were 2 must-have features. I had to
disqualify any unit that didn't have them both.
If your laptop has PCMCIA slots, you could use a parallel/serial PCMCIA
adapter. That would function like a "real" port.
Best regards,
Ivan Baggett
Bagotronix Inc.
website: www.bagotronix.com
Bob Wirka wrote:
Could someone give a recommendation for a device that will allow me to
add ttl-style I/O to a PC or laptop?
Now that parallel ports have gone the way of serial ports, I can't
bit-bang a parallel port anymore.
I've done a poor-man's SPI port, JTAG programmer, and other tasks using
the parallel port, and would like to do some of this with my laptop sans
parallel port. Is there a logic analyzer or some other device out there
that could be plugged into a USB port to provide bit-bangable I/O?
Any suggestions?
Thanks,
Bob Wirka
Realtime Control Works
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