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CProgrammer

the good old parallel port

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Well I built my own ISP Programmer cable that uses the parallel port. Now I used the configuration needed for a programm called isp_avr. Now this programm allows me to enable the output voltage of different pins. Now I tried using a voltmeter to check for voltage between one of the pins and the GND pin. But nothing. How exactly does the parallel port work. Is it possible to detect a voltage between a pin and the GND pin? Is there only a current when the device is atached perhaps? So does the parallel port submit electricity or use that of the device? By the wa<y my cable should be fine I tested it with a resistance measurer and it detected everything correctly. -CProgrammer

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I don't know the details but IIRC the parallel port is able to drive itself, ie. you should be able to detect a voltage on a pin set to high.

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Yes indeedy. I built on IR remote control and decided to use the parallel port for the receiver - using soem VB code to read/write the port status. Indeed, when I wired it up wrongly the first time I erased the firmware off the receiver by pumping the parallel port output voltage through it.

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