New (to me) O2 - sync on green question

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jhodge
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New (to me) O2 - sync on green question

Post by jhodge » Mon Jul 16, 2018 4:24 pm

I just scored a nice O2 on Ebay (intact and almost unscarred skin!) as my first SGI, and so far no real issues. I've worked around the firmware and root passwords and have it up and running, with one issue - everything is heavily green tinted on every monitor I own. Theoretically, my Dell 1907Fp is SOG compatible, but even that has the strong green coloration.

My question - since my understanding is that O2 outputs BOTH SOG and discrete sync, is there any way to tell it to only use one or the other?

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uunix
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Re: New (to me) O2 - sync on green question

Post by uunix » Mon Jul 16, 2018 4:26 pm

Welcome jhodge and congrats.

Just a thought, but can you try a different cable?
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JacquesT
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Re: New (to me) O2 - sync on green question

Post by JacquesT » Tue Jul 17, 2018 10:31 am

Congrats on the acquisition! What spec is the little toaster?

The 1907FP should do SOG just fine.have you tried resetting the monitor to factory defaults?

Also check cable as per uunix as well as the female connection on the motherboard, could be either.

Edit - also resetenv in the prom.
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jhodge
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Re: New (to me) O2 - sync on green question

Post by jhodge » Tue Jul 17, 2018 12:11 pm

I agree, the 1907FP should work fine, but it's not so far. I tried a different VGA cable last night, but no good. I'll see if Dell has a firmware update available (doubtful).

The O2 is pretty basic - 180MHz R5000SC, 192MB RAM, A/V module/4GB HDD. OTOH, it has very clean skins and was only $165 shipped. I have a good stock of 73GB HDDs, so I'm good there.

This is the unit: https://www.ebay.com/itm/Sgi-O2-Compute ... 2749.l2649

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Irinikus
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Re: New (to me) O2 - sync on green question

Post by Irinikus » Tue Jul 17, 2018 12:40 pm

Have you tried using a VGA to DVI converter and using the dvi input on your monitor?

I'm not saying it will work, but it might be worth a try. (it's a pity that the O2 only has an analogue output)

I had the same problem when using a DVI to VGA adapter with my Tezro, and using the VGA input on my Dell monitor, however it works perfectly with a DVI to HDMI converter and the HDMI input. (I am aware that DVI to HDMI is a purely digital interface, and this is more than likely the reason why it works)
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dexter1
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Re: New (to me) O2 - sync on green question

Post by dexter1 » Tue Jul 17, 2018 8:10 pm

It might be that the O2 outputs both sync on green and separate vertical and horizontal signals. Uunix suggestion of getting a different cable will work if you break off the sync pins. These are pins 13 and 14. Do this on an old VGA cable so lillte is lost when you make an error.
This way the monitor will sync only on Green.

jhodge
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Re: New (to me) O2 - sync on green question

Post by jhodge » Sat Jul 21, 2018 6:48 pm

Oddly, the 1907FP has started working correctly. I didn't change anything, but when I powered up today, it works fine and looks great. I deeply distrust things that 'fix themselves', but for now, I'm just going to enjoy it.

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