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Also, the Quadra 800 was not capable of operating at 24-bit color, regardless of the amount of VRAM installed or the use of an external video card, while the Quadra 900 and 950 were capable of 24-bit color. [3] The Quadra 950 was replaced by the PowerPC-based Power Macintosh 9500 in June 1995, with sales continuing until October. [4]
The higher-end model also came with 1MB VRAM installed, enabling 16-bit color at 640x480 resolution. [3] The availability of 16-bit color was significant, as it was the standard bit depth of Apple's then-new QuickTime video standard.
Two VRAM SIMM slots provide the ability to upgrade to 1 MB of VRAM, which allows for 32,768 color (16-bit) resolutions. [2] Unlike the preceding Quadra 700 and Quadra 900/950, on-board video provided by the Quadra 800 is not capable of operating at 24-bit color regardless of how much VRAM is installed, as 24-bit support was removed as a cost ...
Much the way the system BIOS provides a set of functions that are used by software programs to access the system hardware, the video BIOS provides a set of video-related functions that are used by programs to access the video hardware as well as storing vendor-specific settings such as card name, clock frequencies, VRAM types & voltages.
Video random-access memory (VRAM) is dedicated computer memory used to store the pixels and other graphics data as a framebuffer to be rendered on a computer monitor. [1] It often uses a different technology than other computer memory, in order to be read quickly for display on a screen.
The 6360 has two DIMM slots, which can be populated by one or two chips of varying sizes up to 64 MB. Combined with the on-board 8 MB RAM, this provides a maximum memory of 136 MB. Because the board only supports linear memory organization, no performance benefit is provided if two chips of the same type are installed. [22]
In February 1994, [1] a "DOS Compatible" version of the Quadra 610 was introduced as a way for Apple to judge whether the market would be interested in a Macintosh that could also run DOS, providing this DOS compatibility using an additional 486SX processor running at 25 MHz on a card installed in the Processor Direct Slot of the machine. [4]
Since the Old World ROM usually boots to Toolbox, most OSs have to be installed using a boot loader from inside Mac OS (BootX is commonly used for Linux installations). 68K-based Macs and NuBus Power Macs must have Mac OS installed to load another OS (even A/UX, which was an Apple product), usually with virtual memory turned off.