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Thread: Study: Color Depth by function of OS


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Permlink Replies: 9 - Pages: 1 - Last Post: Jun 24, 2014 3:33 PM Last Post By: bbraun
Mk.558

Posts: 20
Registered: 5/31/14
Study: Color Depth by function of OS
Posted: Jun 12, 2014 8:30 PM
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I'm hoping to help solve a question of mine.

There was a post on Macintosh Garden that I read awhile back in which someone wanted to know what games would run under 16 colors. I knew of Falcon MC as one. Then a commentator replied that after a certain OS, the options for black and white, 4 colors, 4 greys, 16 colors and 16 greys were removed. Might have been 8.5 or 8.6.

Would anybody be able find out for me? I fired up a borrowed PM G3 but even under 8.1 it only has 256 colors minimum. A 1400 series PowerBook should be old enough to have the option.
Arbee

Posts: 61
Registered: 11/29/12
Re: Study: Color Depth by function of OS
Posted: Jun 12, 2014 11:41 PM   in response to: Mk.558 in response to: Mk.558
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I believe that varies by the hardware rather than the actual OS; e.g. the drivers for the later PCI ATI chips may not support B&W or 16-color mode.

I just checked the emulated IIci in MESS running 8.1 (with the well known 68030 patch) and all modes were available from B&W up to 256 colors.
Mk.558

Posts: 20
Registered: 5/31/14
Re: Study: Color Depth by function of OS
Posted: Jun 13, 2014 7:11 PM   in response to: Arbee in response to: Arbee
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Could be, I would be inclined to believe you, because otherwise the PM G3 would have those options in 8.1.

But we still won't find out for sure until someone can help us in the software department! I have a IIci on hand but that's too old (will have it) but it also maxes out at 7.6.1.

Unless I'm seriously mistaken, a 1400c should handle this investigation nicely.
Arbee

Posts: 61
Registered: 11/29/12
Re: Study: Color Depth by function of OS
Posted: Jun 13, 2014 8:39 PM   in response to: Mk.558 in response to: Mk.558
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You actually can install and run 8.0 and 8.1 on 32-bit clean '030 Macs if they have enough RAM, the instructions here are what I followed to get it going in the emulation: http://home.earthlink.net/~gamba2/os8_68030.html

Hopefully someone with a 1400c can also check though.
bbraun


Posts: 493
Registered: 7/25/12
Re: Study: Color Depth by function of OS
Posted: Jun 13, 2014 10:50 PM   in response to: Mk.558 in response to: Mk.558
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The video card driver (typically in the nubus card's declrom, or pci equivalent for PCI machines) advertises the video modes it supports, which is the basis for the information displayed in the monitors control panel.
Mk.558

Posts: 20
Registered: 5/31/14
Re: Study: Color Depth by function of OS
Posted: Jun 21, 2014 12:27 PM   in response to: bbraun in response to: bbraun
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Right, I borrowed a 1400cs and found out that 8.5 and 8.5.1 still have Black & White, 4 colors/greys and 16 colors/greys.

I couldn't install 8.6 because it doesn't have enough memory: 8.6 requires 24MB or more of built-in RAM.
bbraun


Posts: 493
Registered: 7/25/12
Re: Study: Color Depth by function of OS
Posted: Jun 21, 2014 2:43 PM   in response to: Mk.558 in response to: Mk.558
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Because the modes offered is a property of the driver, not the OS.
Mk.558

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Registered: 5/31/14
Re: Study: Color Depth by function of OS
Posted: Jun 22, 2014 2:42 PM   in response to: bbraun in response to: bbraun
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Is the driver updated as part of an OS update?

Mac OS 8 looks hilarious in B&W.
Arbee

Posts: 61
Registered: 11/29/12
Re: Study: Color Depth by function of OS
Posted: Jun 22, 2014 4:42 PM   in response to: Mk.558 in response to: Mk.558
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The driver is normally part of the video card's ROM on NuBus and OldWorld PCI Macs. OS updates obviously don't touch it, which is why some cards only work up to a certain OS version.
bbraun


Posts: 493
Registered: 7/25/12
Re: Study: Color Depth by function of OS
Posted: Jun 24, 2014 3:33 PM   in response to: Arbee in response to: Arbee
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The video driver is in ROM because it is used before the OS is booted (the gray screen, cursor, and happy/sad mac has to be displayed somehow).

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