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In computing, hardware overlay, a type of video overlay, provides a method of rendering an image to a display screen with a dedicated memory buffer inside computer video hardware. The technique aims to improve the display of a fast-moving video image — such as a computer game , a DVD , or the signal from a TV card .
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 ...
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 PowerPC 970 ("G5") was the first 64-bit Mac processor. The PowerPC 970MP was the first dual-core Mac processor and the first to be found in a quad-core configuration. It was also the first Mac processor with partitioning and virtualization capabilities. Apple only used three variants of the G5, and soon moved entirely onto Intel architecture.
System 7.1–Mac OS 7.6.1 With 68040 upgrade, Mac OS 8.1, or with PowerPC upgrade, Mac OS 9.1: CPU: Motorola 68030 @ 16 or 33 MHz: Memory: 4 MB onboard, upgradable to 10 MB; With logicboard upgrade: 64 MB, unofficially supports 128 MB of RAM (100 ns 30-pin SIMM) Display: 10 inches (25 cm), 512 x 384 (switchable to 560 x 384) Dimensions: Height ...
These models shipped with Mac OS X, 500, 600, or 700 MHz processors, up to 256 MB of RAM, and a 60 GB hard drive on the Special Edition. [52] Following the introduction of the iMac G4 in January 2002, Apple continued selling some G3-based iMac models, [ 53 ] with 500 and 600 MHz models in indigo, snow, and graphite.
This implies that unless the size of a single scanline's raster data is a power of two, raster data cannot be laid out continuously in video memory. Instead, graphics modes on the CGA store the even-numbered scanlines contiguously in memory, followed by a second block of odd-numbered scanlines starting at video memory position 8,192.
Although this had always been planned from the beginning, Steve Jobs maintained if the user desired more RAM than the Mac 128 provided, he should simply pay extra money for a Mac 512 rather than upgrade the computer himself. When the Mac 512 was released, Apple rebranded the original model as "Macintosh 128k" and modified the motherboard to ...