Supermac PDQ issue....

pizzigri

Well-known member
So first off, I did try to search for this particular problem and I could not find, it so if i missed it i apologize! I've also looked at all jmacz threads but they are way over my paygrade.
I have an identical card to the one I posted a pic of. A Supermac Spectrum PDQ with firmware 1.27 - just like the one pictured. It is installed in the second slot from the PSU of a IIfx, the first slot occupied by a NIC. I have a HD with 7.1 installed, and i also installed the Radius drivers for this board downloaded from te Garden (i think). In any case, the Mac boots, starts OK and arrives to the desktop in B/W, No problem here. I change to 256 grays and still no problem, and also 256 colors, and it works. Boot res is 640x480. Now it's when it becomes weird; in millions of colors, the image is completely cyan, and I can see that both green and blue are displayed but red is a solid black bar in the color gradient inside the monitor color panel. it's only at this resolution that it works; I've also tried changing resolution and it also gives cyan desktop.... what should I look for?
 

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jmacz

Well-known member
i also installed the Radius drivers for this board downloaded from te Garden (i think)

I assume you meant SuperMac drivers? The newest one for that card should be the SuperVideo 2.7.5 control panel.

Now it's when it becomes weird; in millions of colors, the image is completely cyan, and I can see that both green and blue are displayed but red is a solid black bar in the color gradient inside the monitor color panel.

When you say completely cyan, is the entire screen just cyan, or are you saying that the entire screen has a cyan tint?

Also, same issue with and without acceleration enabled? Or does it just happen when acceleration is enabled? I had a cyan tint issue only with acceleration enabled which ended up being one of the four sram chips (broken pins).

On the newer SuperMac cards, only 1/3rd of the VRAM chips are used for anything other than 24bit color (ie. 1bit, 4bit, 8bit only use 8 of the 24 chips). But on these newer cards, it's the red bank that is used for those other bit depths. Curious if the PDQ is the same in which case it's possible that some of those 24 VRAM chips in the middle of the card have a broken solder joint or perhaps something's wrong with a signal that's shared by the red bank of 8 VRAM chips?

I would not think it's the three BSR or three DACs given you are seeing perfect color in 8 bit mode which would make me believe the DAC handling red is working fine. But then it's strange that you're seeing black instead of red in the monitors control panel gradient.
 
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