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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.
Protected memory was only added to Macintosh computers with the release of the Mac OS X operating system. According to Andy Hertzfeld, the Macintosh used for the introduction demo on January 24, 1984, was a prototype with 512k RAM, even though the first model offered for sale implemented just 128k of non-expandable memory. This prototype was ...
The Macintosh was the first successful mass-market all-in-one desktop personal computer with a graphical user interface, built-in screen, and mouse. [33] It was first demonstrated by Steve Jobs in the first of his famous Mac keynote speeches, and though the Mac garnered an immediate, enthusiastic following, some labelled it a mere "toy". [34]
Mac 512K back panel. The Macintosh 512K is a personal computer that was designed, manufactured and sold by Apple Computer from September 1984 to April 1986. It is the first update to the original Macintosh 128K. It was virtually identical to the previous Macintosh, differing primarily in the amount of built-in random-access memory. The ...
It retains the desktop form factor introduced with the 6200, but is built around the "Alchemy" motherboard that was first introduced with the Power Macintosh 5400/120. This board has a 64-bit data path and 64-bit DIMM RAM, PCI slot, and Comm Slot II (incompatible with the earlier Comm Slot). It also includes two GeoPort external serial ports. [4]
Dual-ported video RAM (VRAM) is a dual-ported RAM variant of dynamic RAM (DRAM), which was once commonly used to store the Framebuffer in Graphics card, . Dual-ported RAM allows the CPU to read and write data to memory as if it were a conventional DRAM chip, while adding a second port that reads out data.
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The original Power Macintosh 6100 is based on the 60 MHz PowerPC 601 processor. [6] The base model was complemented by an AV version, which included an add-on card fitted in its Processor Direct Slot that added audio and visual enhancements such as composite and S-video input/output and full 48 kHz 16-bit DAT-resolution sound processing.