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Surprisingly, the first solution to this flaw was published by software utility company Connectix, whose System 6 extension, OPTIMA, reinitialized the Memory Manager and repeated early parts of the Mac boot process, allowing the system to boot into 32-bit mode and enabling the use of all the RAM in the machine.
A Manager was any of a set of specialized components of the classic Mac OS operating system, including those that comprised the Macintosh Toolbox. Each of these Managers was responsible for handling system calls from applications running on the Macintosh , and could be built into the ROM or be loaded into RAM by the system.
In operating systems, memory management is the function responsible for managing the computer's primary memory. [1]: 105–208 The memory management function keeps track of the status of each memory location, either allocated or free. It determines how memory is allocated among competing processes, deciding which gets memory, when they receive ...
Expanded memory manager, Command EMM386 is the expanded memory manager of Microsoft 's MS-DOS , IBM 's PC DOS , Digital Research 's DR-DOS , and Datalight 's ROM-DOS [ 1 ] which is used to create expanded memory using extended memory on Intel 80386 CPUs.
SYS is also a command in Microsoft BASIC used to execute a machine language program in memory. The command took the form SYS n where n is a memory location where the executable code starts. Home computer platforms typically publicised dozens of entry points to built-in routines (such as Commodore's KERNAL [ 10 ] ) that were used by programmers ...
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Upper memory blocks can be created by mapping extended memory into the upper memory area when running in virtual 8086 mode. This is similar to how expanded memory can be emulated using extended memory so this method of providing upper memory blocks is usually provided by the expanded memory manager (for example EMM386).
For example, in DOS 5, if the current directory is C:\TEMP, then TRUENAME command.com will display C:\TEMP\COMMAND.COM (which does not exist), not C:\DOS\COMMAND.COM (which does and is in the PATH). This command displays the UNC pathnames of mapped network or local CD drives. This command is an undocumented DOS command.