Which driver must be loaded in the CONFIG.SYS to give DOS access to extended memory?

Which driver must be loaded in the CONFIG.SYS to give DOS access to extended memory?

• A. EMM386.EXE
• B. HIMEM.SYS
• C. CDROM.SYS
• D. DBLSPACE.SYS

Answer: (B)

The correct answer is HIMEM.SYS because it is the driver specifically designed to manage and provide access to extended memory in DOS environments. Extended memory is a range of memory above the standard 640KB that older DOS systems traditionally accessed. HIMEM.SYS is essential for enabling DOS applications to utilize this additional memory, allowing for more complex programs and better performance. When HIMEM.SYS is loaded through the CONFIG.SYS configuration file, it takes advantage of the memory management capabilities of the system, allowing DOS and compatible applications to get the benefits of expanded memory beyond the conventional limits. This is important for running larger applications or multitasking within the DOS environment. The other options, while related to memory management or storage, do not specifically provide access to extended memory. For instance, EMM386.EXE is used for creating a virtual DOS machine and managing expanded memory, but it relies on HIMEM.SYS to function correctly. CDROM.SYS is a driver for CD-ROM support, and DBLSPACE.SYS is related to disk compression, neither of which is focused on enabling access to extended memory.

The correct answer is HIMEM.SYS because it is the driver specifically designed to manage and provide access to extended memory in DOS environments. Extended memory is a range of memory above the standard 640KB that older DOS systems traditionally accessed. HIMEM.SYS is essential for enabling DOS applications to utilize this additional memory, allowing for more complex programs and better performance.

When HIMEM.SYS is loaded through the CONFIG.SYS configuration file, it takes advantage of the memory management capabilities of the system, allowing DOS and compatible applications to get the benefits of expanded memory beyond the conventional limits. This is important for running larger applications or multitasking within the DOS environment.

The other options, while related to memory management or storage, do not specifically provide access to extended memory. For instance, EMM386.EXE is used for creating a virtual DOS machine and managing expanded memory, but it relies on HIMEM.SYS to function correctly. CDROM.SYS is a driver for CD-ROM support, and DBLSPACE.SYS is related to disk compression, neither of which is focused on enabling access to extended memory.