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FAQs / Re: Laptop requirements with Mach 3
« on: July 17, 2008, 04:04:31 AM »
What about pin voltages? I believe a lot of lap tops don't give out the full 5v on the parallel port pins more like 3.3v which is just in the spec for a TTL 1 signal but not enough for some input devices. I've tried to controlling some home build multiplexers with my old lap top in the past (Toshiba) and this has been one of the problems. I ended up using pull up resistors on the ports and inverting the 1' signal so that the device took a o to be a 1 (if this makes sense). I have a different problem trying to get driver test to run on my lap top. I've seen a screen shot of a pals PC and his mach3 icons are grey scale with a grey background mine are coloured but his works and mine doesn't does anyone know why there is a difference?
Thanks.
Thanks.