HP Visualize C200 - video issue

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commodorejohn
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HP Visualize C200 - video issue

Post by commodorejohn » Tue Jun 05, 2018 3:44 am

Well, used to be I'd ask on Nekochan for this kind of thing, but...I have an HP Visualize C200 PA-RISC workstation I just got around to doing a fresh install of HP-UX 11.11 on. I had to track down an EVC-to-VGA converter to go with the video card, and while it does display a picture, the entire screen has a yellow tint and areas that are predominantly blue are closer to black, so it seems like the blue channel has been cut out. I got three EVC adapters in a lot, all apparently identical, and the same behavior occurs with all of them. My question is, is there any tricky business with the EVC standard where I might have gotten a subtly-incompatible adapter that would cause this? Or is this more likely an issue with the video card itself, or a software issue on HP-UX's end?
Computers: Amiga 1200, DEC VAXStation 4000/60, DEC MicroPDP-11/73
Synthesizers: Roland JX-10/SH-09/MT-32/D-50, Yamaha DX7-II/V50/TX7/TG33/FB-01, Korg MS-20 Mini/ARP Odyssey/DW-8000/X5DR, Ensoniq SQ-80, E-mu Proteus/2, Kilpatrick Phenol, Behringer Model D

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kokoboi
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Re: HP Visualize C200 - video issue

Post by kokoboi » Wed Jun 06, 2018 4:24 pm

I have used the EVC to VGa adapter on HP 743 VME board and experienced the same yellow tint.
Didn't figure out what the problem is, but I suspect it could run fine if I had a HP branded EVC converter.

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commodorejohn
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Re: HP Visualize C200 - video issue

Post by commodorejohn » Wed Jun 06, 2018 5:36 pm

Hm. Glad it's not just me, at least. May have to try looking for an HP part, just to see if it makes a difference, even though there doesn't seem to be an obvious reason why it should...

Edit: okay, just for kicks, I got out the multimeter and verified that there's continuity on the cable between the VGA blue pin and the EVC blue pin, as well as between the VGA blue ground and the EVC pixel ground. So unless HP actually used some non-standard EVC variant, I find it hard to believe the cable is causing the issue here. Then again, if you had the exact same problem on a different piece of HP gear, it's hard to conclude that it'd be a defect in the card, either...huh.
Computers: Amiga 1200, DEC VAXStation 4000/60, DEC MicroPDP-11/73
Synthesizers: Roland JX-10/SH-09/MT-32/D-50, Yamaha DX7-II/V50/TX7/TG33/FB-01, Korg MS-20 Mini/ARP Odyssey/DW-8000/X5DR, Ensoniq SQ-80, E-mu Proteus/2, Kilpatrick Phenol, Behringer Model D

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PA8600
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Re: HP Visualize C200 - video issue

Post by PA8600 » Sat Jun 16, 2018 6:33 pm

I have a genuine HP EVC adapter on my C3000 and it works great with no video issues. HP might have done something different, I'm not sure.
HP: C3000, B2600, 425T, RX2620, ZX6000, Vectra VA, Omnibook 800CT
SGI: :O2: R10k (dead), :Octane: R12k 300mhz, :320:
IBM: RS/6000 43p, Intellistation Power 275, P5 505, Thinkpad 380D, 390
Sun: Ultra 45, Blade 2500, Blade 150, SS IPC (bad psu)

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commodorejohn
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Re: HP Visualize C200 - video issue

Post by commodorejohn » Sat Jun 16, 2018 6:40 pm

Hm. If you happen to have a multimeter/continuity tester, any chance could you tell which pin on the EVC connector the VGA blue pin (top center) goes to?
Computers: Amiga 1200, DEC VAXStation 4000/60, DEC MicroPDP-11/73
Synthesizers: Roland JX-10/SH-09/MT-32/D-50, Yamaha DX7-II/V50/TX7/TG33/FB-01, Korg MS-20 Mini/ARP Odyssey/DW-8000/X5DR, Ensoniq SQ-80, E-mu Proteus/2, Kilpatrick Phenol, Behringer Model D

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