Re: [CAD_CAM_EDM_DRO] Re: Controlling VFDs from your PC?

audiomaker2000 wrote:

>
> Thanks guys.
>
> That makes me ask....
>
> How do you produce an analog signal of varying voltage from one of
> your computer's ports?

You don't, you use specialized (but not necessarily
expensive) hardware.

Check out the range of ISA and PCI cards that do digital
and analog I/O in the $29-$120 range at http://www.bsof.com

For example: $89 A100
- 14 programmable TTL compatible I/O lines
- 8 channel 8 bit analog in
- 1 channel 8 bit analog out

http://www.bsof.com/a100prod.htm

or their $89 Dig120
http://www.bsof.com/d120prod.htm
- 24 Programmable TTL I/O lines
- Two 12-Bit resolution DAC's (0-5V or +/- 5V outputs).

another interesting thing is their PCI bus
dual parallel port card $39 http://www.bsof.com/pciio.htm
- they claim triple the speed of ISA pport cards.
- comes with Windows 95, 98,Me & NT 4.0/2000/Linux
source code CDROM.

Doug Fortune
http://www.cncKITS.com