Apple 640 manual Memory management utilities

Memory management utilities

If you use a memory management utility such as EMM386 or QEMM, you need to configure it so that it runs with your DOS-compatibility hardware and software.

IMPORTANT Apple Computer does not recommend using automated memory configuration utilities with your DOS-compatible Macintosh, because they can require more memory than management utilities you configure manually. In addition, some memory configuration utilities may not be compatible with DOS-compatibility hardware.

If you want to use the EMM386 utility (included as part of DOS) and don’t require expanded memory, set a “DEVICE=” line in the CONFIG.SYS file to the following:

DEVICE=C:\DOS\EMM386.EXE NOEMS RAM=D000-EFFF

If you require expanded memory, set a “DEVICE=” line in the CONFIG.SYS file to the following:

DEVICE=C:\DOS\EMM386.EXE RAM=D000-EFFF FRAME=D000

If you want to use the QEMM utility, use the frame option (ST:F):

DEVICE=C:\QEMM\QEMM386.SYS RAM ST:F ARAM=B080-B7FF ARAM=C900-DFFF R:1

If you want to use the Stealth mapping option (ST:M), set a “DEVICE=” line in the CONFIG.SYS file to the following:

DEVICE=C:\QEMM\QEMM386.SYS RAM ST:M X=C800-CFFF X=FC00- FCFF X=FE00-FFFF ARAM=B080-B7FF ARAM=C900-DFFF R:2

Configure other memory management utilities so that D000 through EFFF is the only area in the BIOS that can be mapped to upper memory.

To prevent the read-only memory (ROM) BIOS from becoming damaged when the DOS-compatibility card is configured for 2 MB of memory, set the switch in the CONFIG.SYS file to turn memory testing off.

DEVICE=C:\DOS\HIMEM.SYS /TESTMEM:OFF

For more information on making the best use of memory, read the sections on memory management in your DOS manual, or refer to the documentation for your memory manager if you are using a utility other than EMM386

or QEMM.

Operating in the PC Environment 45