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Unknown video card
- Thread starter marmotta
- Start date
Test it with Speedometer 3 or 4 and see. I would imagine so. The Quadra 700 uses the central systems RAM and CPU, so even it is just as fast as the Q700, you have mor RAM and CPU cycles at your disposal.
Native resolution of lcd is 1024x768, but if I set (with dipswitches in converter) 640x480 the problem is the same... I think is a refresh problem, macos not allow me to change resolution or refresh and at reboot probably use 100hz refresh! The pram is ok (3,6v)
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You'll need a Multi-Sync LCD, yours appears to be fixed at the 60Hz VGA standard. The Card's probably outputting a 75Hz refresh rate.
Quadra 700/900 graphics were groundbreaking for the Mac, being the first Magapixel implementation, but at a "measly" 8bits by comparison. It took three times the Quadra's 1MB max VRAM do so it at full color.
No, a NuBus card won't be faster than the Quadra 700's built-in video within its limited capabilities.The bandwidth limitations of NuBus make the cards slower at things like gaming or basic window scrolling, but those were never the purposes of multi thousand dollar NuBus graphics cards. More (TPD) and better (24bit depth) pixels along with QuickDraw acceleration (and DSP based acceleration for Photoshop filters for later cards) would be the stratospheric realm of NuBus Graphics.
Quadra 700/900 graphics were groundbreaking for the Mac, being the first Magapixel implementation, but at a "measly" 8bits by comparison. It took three times the Quadra's 1MB max VRAM do so it at full color.
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The vast majority of LCDs are VESA's 60Hz VGA standard refresh rate only. Very few NuBus Graphic Cards from the 68k era support 60Hz at all and only 640x480 a/o 800x600 if that. Can't think of a single one from the 1991 time frame at all offhand. If an LCD supports the oddball "flicker-free" Mac refresh rates of 66/75Hz it'll "just work" and if not never will for the most part. I've never run across an LCD that supported multiple resolutions that didn't auto-adjust on its own.
I don't think it was until the Radius/Apple 24AC twins that 1024x768@60Hz was supported by the Mac. Radius and others supported it with earlier cards, but the 24AC was Apple's first offering, IIRC. Still feeling Stuffed, Sleepy and Stupid after Thanksgiving, so don't hold me to it. :
http://home.earthlink.net/~gamba2/vid-mon-matrix.html#party
I don't think it was until the Radius/Apple 24AC twins that 1024x768@60Hz was supported by the Mac. Radius and others supported it with earlier cards, but the 24AC was Apple's first offering, IIRC. Still feeling Stuffed, Sleepy and Stupid after Thanksgiving, so don't hold me to it. :
http://home.earthlink.net/~gamba2/vid-mon-matrix.html#party
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I have a partial solution, when I reboot I press option key and graphic board switch all resolution, press space on good resolution and automatically reboot whit my choice.
Why not save my choice? (remember pram is ok, clock is correct)
In the supervideo 2.7.5 control panel if I select a screen resolution tab the program say: "unable to comunicate with your video card", I need to use another type of db15>svga converter?
Why not save my choice? (remember pram is ok, clock is correct)
In the supervideo 2.7.5 control panel if I select a screen resolution tab the program say: "unable to comunicate with your video card", I need to use another type of db15>svga converter?
Incredible and strange... I solved the problem! I changed the nubus slot at the card! From the lower to the upper... Now supervideo work and my lcd don't lose the sync!
For the graphics performance I run Macbench 3.0 and the graphics score is 62% of Powermac 6100! Slow? I run the test at 1024x768x8, powermac 6100 run the test at 640x480x8!!!! And in some test I have exceeded the powermac!
Is good? (i not have q700 onboard video results)
For the graphics performance I run Macbench 3.0 and the graphics score is 62% of Powermac 6100! Slow? I run the test at 1024x768x8, powermac 6100 run the test at 640x480x8!!!! And in some test I have exceeded the powermac!
Is good? (i not have q700 onboard video results)
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