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In computer architecture, 512-bit integers, memory addresses, or other data units are those that are 512 bits (64 octets) wide. Also, 512-bit central processing unit (CPU) and arithmetic logic unit (ALU) architectures are those that are based on registers , address buses , or data buses of that size.
In particular, Microsoft Excel, which was written specifically for the Macintosh, required a minimum of 512 KB of RAM, but solidified the Macintosh as a serious business computer. Models with the enhanced ROM also supported Apple's Switcher , allowing cooperative multitasking among (necessarily few) applications.
The RAM map is organised so that the system globals, system and application heaps grow upwards from low memory; everything else grows downwards from MemTop, from high memory towards low memory. On the 512K Macintosh, the "extra" RAM thus appears as a wider gap between the application heap and the stack, where it is available for application use.
One further upgrade made by Apple replaced the logic board and the rear case (to accommodate the different port configuration) with those of the Macintosh Plus, providing built-in SCSI functionality and up to 4 MB RAM. Because Apple's official upgrades were costly, many third-party manufacturers offered add-on SCSI cards, as well as RAM ...
As an example, a 512 MB SDRAM DIMM (which contains 512 MB), might be made of eight or nine SDRAM chips, each containing 512 Mbit of storage, and each one contributing 8 bits to the DIMM's 64- or 72-bit width. A typical 512 Mbit SDRAM chip internally contains four independent 16 MB memory banks. Each bank is an array of 8,192 rows of 16,384 bits ...
The Commodore RAM Expansion Unit (REU) is a range of external RAM add-ons. At the time of introduction of the Commodore 128 home computer, two REUs were announced for that model; the 1700 (128 KB) and 1750 (512 KB) REUs. Later, Commodore introduced a third model, for their Commodore 64 model: the 1764 (256 KB) [1]
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