There are dozens of devices that will fulfill that role.
National, Keithley, Iotech, Measurment Computing come to mind for
commercial grade. 

>-----Original Message-----
>From: [EMAIL PROTECTED] 
>[mailto:[EMAIL PROTECTED] On Behalf Of Bob Wirka
>Sent: Tuesday, January 03, 2006 12:50 PM
>To: Protel EDA Discussion List
>Subject: [PEDA] Testing Boards?
>
>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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