Quadra 800 8-24 Nubus Card Green Issue

[thellmer]

Anyone had any success with using an LCD monitor with the Apple Display 8-24 card? I wanted 24-bit color so I found a nice decently priced 8-24 card and put it in my Quadra today. But everything is green. The ASUS Multi-sync monitor works great with the onboard video port in Thousands of colors, but moving the monitor and adapter to the Nubus card results in a green tint on everything. I've tried dozens of settings on the 10-switch adapter - nothing seems to work at all other than the Mode 5 (separate sync) column, and those work as expected with respect to resolution, and depth options, however everything is green regardless of color depth or resolution options. I added the Basic Monitor extension and the Apple Display software 2.0.2 which supposedly addressed the green issue back in the day (on CRT), but it didn't help. Resolutions and millions of colors work as they should from the control panel standpoint...just everything is overlaid with green. None of the sync-on-green settings work at all, but I suspect that might be related somehow. I have a 12" RGB but it has capacitor issues so once it boots the screen goes into sync and vertical overlap problems so that doesn't really help with settings or trying to solve the issue. Ive seen some other threads here about green issues but setting the adapter to the 1467 doesn't help this monitor. Like I mentioned, the monitor and adapter work great on the onboard port with thousands of colors in various resolutions, its just this Nubus 8-24 card which seems to not like it. Ideas to try?

 

[volvo242gt]

Which adapter are you using? If it's the Sony MacView LX, I found that setting it to VGA mode made my Dell flatpanel work properly on my older Macs. Think the DIP switches that needed to be on were the two middle switches, with everything else off.

 

[thellmer]

Solved the issue by switching back to a much older 19" LCD "TV" which has the VGA Input. The colors are nice and clean now. I tried all sorts of different switch configurations and finally landed on the 21" Multiscan which gives me the Millions of colors but only in the 640x480 mode, but I can live with that since I will put the new LCD that had the green issue back on the onboard video port then I can switch back and forth to whichever monitor I want to use with whatever color combinations each provides. Was hoping to get the Millions of colors in 1024 x 768 which supposedly the card supports, but for some reason that switch configuration on the adapter results in no video at all (monitor won't even wake up) and on the Multi-Scan 640 x 480 seems to be the only resolution choice available with the regular control panels and control strip buttons. On the onboard video using the same adapter set to the same settings (21" multiscan) I can choose from all the different resolutions. I guess maybe it could be the old TV is reporting back to the card that it is simply VGA and the adapter isn't really making it think differently? Its a generic 10-switch 15 pin to VGA adapter, but it works like you would expect with the onboard controller but not this 8-24 card. At least the green is gone though

 

[Phipli]

Was hoping to get the Millions of colors in 1024 x 768 which supposedly the card supports

It doesn't support 24bit at 1024x768, only 8bit. It only has 1MB of VRAM. You might be confusing it with the 8•24 GC, which is a whole different beast.

 

[thellmer]

I was going off this: https://vintageapple.org/gamba2/vid-mon-matrix.html and this: https://lowendmac.com/1990/macintos...text=The 8•24 supports,bit color (256 colors) - both say it should give millions of colors up to the 1024 x 768 modes?