Apple Macintosh LC 630 DOS - Manual (Page 77)

Changing the amount of conventional memory
Many DOS and Windows programs require conventional memory to run.
At the same time, many device drivers and TSRs may be loaded into
conventional memory. If you find that you do not have enough conventional
memory to run some of your DOS or Windows programs, take the
following steps.
To increase Upper Memory Block (UMB) space to 122K instead of 64K, add
the following line to your CONFIG.SYS file:
DEVICE=C:\WINDOWS\EMM386.EXE RAM=D000-EFFF FRAME=D000
To load DOS into the UMB (high memory) also add the following to your
CONFIG.SYS file:
DOS=HIGH, UMB
Insert the LOADHIGH (LH) command before all TSRs and device drivers in
the AUTOEXEC.BAT file. For example:
LH C:\DOS\SMARTDRV.EXE /X
This will load these into UMB (high memory). If you run out of UMB space,
you may see an error message like this during the boot process:
Run time error R6009
-not enough space for environment.
In this case, remove LH from TSRs and device drivers one or two at a time,
and try again until the error message does not appear.
If a DOSCLIP copy command is executed from within Harvard Graphics 3.0,
then the PC crashes when Harvard Graphics is quit. To prevent this, use the
steps outlined above, making sure that SMARTDRV is one of the drivers
preceded with LH.
IMPORTANT To prevent the System BIOS from becoming corrupted when the
PC 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
66 Chapter 6