When I run a series of test sequences through my 595, I get a few channles that do not always turn on. I assume the channels are not turning on because the LED indicator for that channel doesn't turn on (SSRs are not yet built - so I cannot be certain if it is the LED or the channel).
If I step through each channel 1 second at a time, I always end up with 2 or three that wont turn on. Sometimes its numbers 44, 52, and 64 that will not turn on - sometimes it is another combination of some other three. Never the same ones all the time. And never channels 1 through 32 (always between 33-64). If I turn on two at a time, then usually two or three wont turn on (rarely the same ones each time - even during the same run). But If I turn on 4 or more at a time, the correct LEDs always light up all the time - to include the ones that didn't turn on before.
I am running Windows XP and Vixen 1.1 on a P-II, 500 MHz, 512 RAM (old and slow) with most background software turned off. I have set my parallel port to bi-directional, EPP, and ECP with the same results for each setting. Only one I haven't tried is Output Only.
Could this be an "old computer" problem, a "you didn't build the 595 right" problem, or is it a "Vixen on my machine" problem? I would appreciate any assitance you can provide. Also, if this is the wrong forum area, please let me know so I can carry on my post in the right place.
Thanks in advance
Steve
If I step through each channel 1 second at a time, I always end up with 2 or three that wont turn on. Sometimes its numbers 44, 52, and 64 that will not turn on - sometimes it is another combination of some other three. Never the same ones all the time. And never channels 1 through 32 (always between 33-64). If I turn on two at a time, then usually two or three wont turn on (rarely the same ones each time - even during the same run). But If I turn on 4 or more at a time, the correct LEDs always light up all the time - to include the ones that didn't turn on before.
I am running Windows XP and Vixen 1.1 on a P-II, 500 MHz, 512 RAM (old and slow) with most background software turned off. I have set my parallel port to bi-directional, EPP, and ECP with the same results for each setting. Only one I haven't tried is Output Only.
Could this be an "old computer" problem, a "you didn't build the 595 right" problem, or is it a "Vixen on my machine" problem? I would appreciate any assitance you can provide. Also, if this is the wrong forum area, please let me know so I can carry on my post in the right place.
Thanks in advance
Steve