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Apple's System 7 Tune-up addon added a "minimum" memory size and a "preferred" size—if the preferred amount of memory was not available, the program could launch in the minimum space, possibly with reduced functionality. This was incorporated into the standard OS starting with System 7.1, but still did not address the root problem. [8]
Mac 512K side-view showing interrupt and reset interface As with the original Macintosh, the 512K was designed with no slots for upgrade boards and had no hard-disk controller, so the few internal upgrades that were available for the 512K, such as General Computer 's US$2,795 Hyperdrive hard drive, had to plug directly into the 68000 processor ...
For this reason, 512Ke users' only hard disk option is the slower, floppy-port-based Hard Disk 20, or similar products for the serial port, even though the 512Ke ROMs contain the "SCSI Manager" software that enables the use of faster SCSI hard disks (because the ROMs are the same as the ones used in the Mac Plus, which does have a SCSI port ...
When the kernel swaps pages out of physical memory, it uses the highest-priority backend with available free space. If multiple swap backends are assigned the same priority, they are used in a round-robin fashion (which is somewhat similar to RAID 0 storage layouts), providing improved performance as long as the underlying devices can be ...
Paged allocation divides the computer's primary memory into fixed-size units called page frames, and the program's virtual address space into pages of the same size. The hardware memory management unit maps pages to frames. The physical memory can be allocated on a page basis while the address space appears contiguous.
The amount of available space increases as the break value increases. The available space is initialized to a value of zero, unless the break is lowered and then increased, as it may reuse the same pages in some unspecified way. The break value can be automatically rounded up to a size appropriate for the memory management architecture. [4]
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macOS Sierra requires at least 2 GB of RAM and 8 GB of storage space and is designed to run on the following products: [7] iMac (Late 2009 or later) MacBook (Late 2009 or later) MacBook Air (Late 2010 or later) MacBook Pro (Mid 2010 or later) Mac Mini (Mid 2010 or later) Mac Pro (Mid 2010 or later)
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