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madmango
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Joined: 15 Jul 2003
Posts: 507
Location: PA, USA
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 Posted: Tue Nov 30, 2004 12:36 am Post subject: Calling anybody who has built a parallel -> psx interface |
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*sigh* Usually my electronics skills are pretty good, but I've got no clue what i've don'e wrong this time.
I'm trying to construct a parallel -> playstation interface as described in gamecon.c, joystick-parallel.txt (kernel stuffs) and this website:
http://www.geocities.com/deonvdw/Docs/Diagrams/Playstation/PSXLinux.htm .
I'm using the driver located here: http://rufus.hackish.org/wiki/gamecon .
I'm fairly certian I wired up the thing correctly. Here's what I've done (now in ascii art-o-vision!):
| Code: | |--------| (+7.5V)
| 7.5V | |-----------------------------------------------------------|
| AC | | |
| Adapter| | (+3V) |
| | | |-----|------------------------------------------| |
|--------| | | O | | |
(-)| | (+) | |-----| <- +3V Regulated Out | |
| | | |LM | | |
| | | |317T | | |
| | | |-----| _________ | |
| | | | | |-|_________| <- Capacitor (electolytic) | |
| |-----|----| | | |-| | |
| | |-^~^~^~-| | <- Resistor | |
| |------------| | | |
| | | | |
| (&) <- Trim pot | | |
|----------------|----------------| | |
| |
|----------------------------------------------------------------| |
| (+3V) |
| |
| |--------------------------------------------------------------|
| | (+7.5V)
| |-X To every pin 3 of every controller
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|-X To every pin 5 of every controller
Pin 2 of every controller is wired to parallel port pin 2
Pin 4 of every controller is wired to parallel port pins 18-24 (the ground pins)
but NOT wired to the negative part of the AC adapter
Pin 6 of every controller is wired to parallel port pin 3
Pin 7 of every controller is wired to parallel port pin 4
Pin 1 of the first pad is wired to parallel port pin 10
Pin 1 of the second pad is wired to parallel port pin 11
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No dice. Even the windows driver for it won't work in windows (ppjoy driver). Does anybody see where I went wrong?
A voltmeter across the top of the Voltregulator and the negative part of the adapter reads +3.5V and the adapter's voltage is +7.5V (approx). And yes, I've double-checked all the connections.
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madmango
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Joined: 15 Jul 2003
Posts: 507
Location: PA, USA
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| Posted: Tue Nov 30, 2004 7:45 pm Post subject: |
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Look, I know I'm asking a lot here, but can anyone help me?
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 55040
Location: 56N 3W
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| Posted: Tue Nov 30, 2004 8:32 pm Post subject: |
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madmango,
How good is the 7.5 volts out of the adaptor?
Is it just rectified or is it smoothed as well?
Is it even D.C.
Is the (-) side of the adaptor connected to the PC somewhere?
If not thats a problem. There will be a ping on the parallel port provided for 0v. It should go there.
the adaptor output will be floating and the 3v and 7.5v needs a reference | Code: | .
Pin 4 of every controller is wired to parallel port pins 18-24 (the ground pins)
but NOT wired to the negative part of the AC adapter |
Why not ?
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NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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madmango
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Joined: 15 Jul 2003
Posts: 507
Location: PA, USA
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| Posted: Wed Dec 01, 2004 1:21 am Post subject: |
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It's just a standard 7.5V 2500mA AC/DC radioshack adapter. I think it rectifies and smooths the signal, and it worked fine when i had this wired up for DirectPadPro.
As to the negative thing, I"ve now wired every ground to ground, including the negative part of the adapter. So the ground pins on the port (18-24) are wired to the negative part of the adapter plug, as well as the negative controller pins. As far as I can tell it still doesn't work.
Why not? My electronics skills have signifigantly gone down as i haven't used it in sometime (hopefully my electronics classes will take care of this). I was afraid of there being a negative charge on the parallel port's ground or something.... don't ask me why. I see that there has to be a potential difference for this to work now.
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madmango
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Posts: 507
Location: PA, USA
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| Posted: Wed Dec 01, 2004 2:04 am Post subject: |
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And now it works for two devices. I guess 2500mA isn't enough supply for three (for maybe the limit in the regulator)
I'm also having segfault problems with the driver that I will post in a seperate thread. Thanks.
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