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| DaOld Man:
Cametron, that would work, but it would also require another hand full of parts. CSA3d, I used whichever pin stayed high during the boot process. remember, Mrotate2 sets all outputs low when it first starts, so us eone that turns on high when computer boots. Monmotha, I didnt know this. i will have to try it when I get home. CSA3d, yes, you can use pins 10 and 11, just set mrotate2 to invert pin11. I think those terminal bloacks are called euro blocks(?) I ordered some from digikey. (Radio Shack doesnt have them). *Edit* I misread the post... I think I can set pin 1 high, just another revision. :) Level42: I tried that on my BIOS, it didnt work for me. But I have found that computers act differently, so it's worth trying. You all do know that i went through this about a year ago and just about wrote a book on it LOL. Here is a post from my original thread: http://forum.arcadecontrols.com/index.php?topic=72750.msg758713#msg758713 I think I posted links to where I got my parts, including the terminal blocks. Honestly, since you have already wired in the two transistors, I would just try the third one. It was so simple and it worked perfectly for me. still working today. well, not today since I removed my arcades computer to use while my desktop is down. (Ref my rant in Everything Else). But im 100% sure it will work when I put the arcade back together. |
| MonMotha:
--- Quote from: csa3d on January 24, 2009, 11:46:48 am ---What are the blue top mount screw thingers called on this image and can one purchase them from RadioShack or are they special order elsewhere? -csa --- End quote --- Those are generally called "terminal blocks" or just sometimes "terminals". Radio Shack at one point sold them, but they appear to no longer carry them. You can buy them from any large supplier (Digi-Key, Mouser, etc.) from lots of different manufacturers such as Phoenix Contact, OST, Weidmuller, etc. Those are *NOT* "eurostyle". Regarding tying 12, 13, and 15 low, you should only have to tie one of the, but doing all 3 should pretty well convince Windows that your device is not IEEE1284 compliant. The key is that you're allowed to futz with all the data lines as long as strobe is high for any device, but IEEE1284 devices will respond in a certain way to certain data patterns which will then allow the stobe line to be used for nibble mode input. If you convince Windows that your device is not IEEE1284 compliant, it should "give up" attempting to do PnP discovery and should never take strobe low since that could cause problems with "compatibility mode" (aka old) devices. |
| richms:
In that case a latch attached to the strobe line should get you sorted. There is something that you can loop back on a parallel port to make it so you can just echo stuff to it, which I did when I was wanting to get a PC to spit out some data to a circuit hooked up to it and I had just gone to windows NT and noone had any working port IO stuff at the time. I would have to dig it out but I think it was looping the strobe line back to the ACK pin, but I am not 100% sure. Edit Actually forget the latch idea, they start up with random stuff on the output, so you may just be better off with a delay to power it up if you are going to keep with the non processor driven motor control. |
| MonMotha:
Well, I had thought about a latch, but what he has already should work given some assumptions about the device he's hooking up to (which I assume are correct, otherwise this wouldn't work at all). If you do want to use a latch, a simple RC setup on the master reset pin can make the "random startup data" a non-issue. I would have suggested a latch, but the 74373/74573 both have active high latch enable (level sensitive), while this application would want active low. An edge triggered device like a 74374/74574 might do the trick. Of course, then you might as well go for broke and use EPP mode :) |
| csa3d:
--- Quote from: Level42 on January 24, 2009, 05:06:38 pm ---On the other side, can't you configure the parallel port in the bios to set it as a old-fashioned bi-directional port and would that change the behavior on start-up ? --- End quote --- I have looked in my bios, and there are 5 options to choose from, at this time.. i don't remember what those are. It defaulted to cpp+epp or something with a plus in it (there was only one of those options). I went through each option in the bios, saving it, and restarting. All modes appeared to have a similar effect. This being said, for what I'm trying to pull off, what would everyone suggest be the default bios settings for the printer port and why. Thanks -csa |
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