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Main => Main Forum => Topic started by: big10p on February 12, 2016, 11:54:10 am

Title: How to fake PC header connections?
Post by: big10p on February 12, 2016, 11:54:10 am

Hi

I'm currently putting together another MAME rig from a de-cased PC, but the BIOS is detecting that the front panel USB 2.0 ports and audio jacks aren't connected to the headers on the motherboard. This is annoying, as I then have to press F1 to continue booting into windows.

So, the question is, how can I fool the BIOS into thinking the header cables are connected? Presumably I just need to short certain pins? Below are the pinouts of the headers I'm talking about.

Thanks.

(http://i.imgur.com/yF5D9.jpg)

(http://www.frontx.com/cpx108_2p4.gif)

Title: Re: How to fake PC header connections?
Post by: Malenko on February 12, 2016, 12:45:58 pm

anything stopping you from ripping the front panel out of the case, and just plugging it in without using it?

Title: Re: How to fake PC header connections?
Post by: DudeRegular on February 12, 2016, 12:48:37 pm

Also poke around in the bios for a setting along the lines of halt on error.

Sent from my LGLS990 using Tapatalk

Title: Re: How to fake PC header connections?
Post by: big10p on February 12, 2016, 01:20:20 pm

I want to keep the case intact, as I plan on using it in the near future.

I looked at the Halt settings in BIOS, but they can't be turned off. The only 2 settings are 'All' and 'All, but keyboard'.

I think I'll get the multimeter out and see if I can figure out which pins get connected by the header cables.

Cheers.

Title: Re: How to fake PC header connections?
Post by: ed12 on February 12, 2016, 01:25:14 pm

pin 7 to gnd
or to high,whichever it likes

that is your sense line

ed

Title: Re: How to fake PC header connections?
Post by: big10p on February 12, 2016, 03:54:58 pm

Thanks, ed12. I connected pin 7 to pin 4 (3.5v) and that's sorted the audio detection. Not even sure how this works TBH, as there's no continuity (or resistance) between those pins, on the cable. I could only read continuity between pins 1 and 3. Hmmm.

Anyway, I also sorted the USB detection by connecting S-GND to GND, which is what the cable was doing.

Cheers all.