Apple Macintosh LC 630 DOS - Manual (Page 130)

When I start up certain software in the PC environment, my Apple monitor shows a
jumbled image and the display rolls.
Some application programs that write directly to the hardware (especially
games) may cause the Apple 13", 14", and 16" monitors to lose video
synchronization at program startup. Call the software company to see if the
software has a switch to force it to make BIOS calls (or if an upgrade is
available with this feature).
DOS begins to start up but then the screen freezes. My cursor blinks, but I cannot
type anything.
Press x-Control-Alt-[keyboard] period to restart the PC. When you see the
message “Starting MS-DOS,” press and hold the F5 key. This will bypass your
CONFIG.SYS and AUTOEXEC.BAT files. Edit the CONFIG.SYS file so that
the HIMEM.SYS driver looks like the following:
DEVICE=C:\DOS\HIMEM.SYS /TESTMEM:OFF
Restart the PC; it should now start up normally.
Reinstalling the DOS-compatibility software
Your Macintosh DOS-compatible computer comes with the
DOS-compatibility hardware and software already installed. You
should reinstall the software only if you are having severe software problems.
Follow the instructions in this section.
There are several steps to reinstalling your DOS-compatibility software:
m install the Mac OS software
m create a storage area (called a drive container) for DOS software
m set aside RAM for the PC environment, if necessary
m install the Microsoft MS-DOS operating system (and Microsoft Windows
if you wish)
m install the additional DOS software that came with your DOS-compatible
computer
m install your own PC software
For information on setting up the software after you install it, including
additional changes you may need to make to the DOS AUTOEXEC.BAT and
CONFIG.SYS files, see Chapter 5.
119 Troubleshooting in the PC Environment