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It had no problems, however, operating under HIMEM and EMM386 as supplied with MS-DOS 6.2.
Two of the most important uses of the DEVICE command involve HIMEM.SYS and DOS itself.
Included with the DOS 5.0 upgrade is HIMEM.SYS, a program that provides access to extended memory and insures that no two programs can use the same memory address.
using IBM model 50, himem sys, smartdrv." Among all possible variables, an adviser targeted SMARTDRV as the most likely source of difficulty and gave the user a general sequence of actions for examining SMARTDRV.
Conventional Memory Name Size in Decimal Size in Hexadecimal MSDOS 42848 (41.8KB) A760 HIMEM 1072 (1.0KB) 430 EMM386 3232 (3.2KB) CA0 SETVER 400 (0.4KB) 190 CDROM 21184 (20.7KB) 52C0 COMMAND 3392 (3.3KB) 52C0 MSCDEX 27952 (27.3KB) 6D30 GMOUSE 16992 (16.6KB) 4260 FREE 64 (0.1KB) 40 FREE 80 (0.1KB) 50 FREE 537840 (525.2KB) 834F0 TOTAL FREE: 537984 (525.4KB) Upper Memory Name Size in Decimal Size in Hexadecimal SYSTEM 167472 (163.5KB) 28E30 SMARTDRV 26000 (25.4KB) 6590 FREE 32 (0.0KB) 20 FREE 68576 (67.0KB) 10BE0 TOTAL FREE: 68608 (67.0KB) All these programs were currently using conventional memory and we have 525.1KB available for other programs.
Also, before we can use extended memory, we must load a special program, the extended memory manager (named HIMEM.SYS in DOS), which knows how to address memory beyond 1 megabyte.
HIMEM.SYS: The MS-DOS extended-memory manager, HIMEM, automatically tests your system's memory when you start your computer.
The install program will detect DOS 5.0 or Windows HIMEM.SYS and ask if you want HIMEM.SYS removed.
Most Windows users are at least somewhat familiar with HIMEM.SYS because it is an extended memory manager and most computers running Windows have some extended memory.
DOS memory management includes two components, HIMEM.SYS and EMM386.EXE, that permit the use of available memory between 640K and 1MB, as well as simulated expanded memory.
Typically, an extended memory device driver such as HIMEM.SYS will do the trick.