Apple 640 manual Reinstalling the DOS-compatibility software

When you start up certain software in the PC environment, your monitor shows a jumbled image and the display appears to “roll.”

A program that writes directly to the hardware (especially a game) may cause the Apple 13", 14", and 16" monitors to lose video synchronization at program startup. Call the program’s manufacturer to see if the program has a switch to force it to make BIOS calls (or see if an upgrade that has this feature

is available).

DOS begins to start up but then the screen freezes. The cursor blinks, but you cannot type anything.

Press x-Control-Alt–[keyboard] period to restart the PC. When you see the message “Starting MS-DOS,” press and hold down 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 environment; 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:

minstall the Mac OS software

mcreate a storage area (called a drive container) for DOS software

mset aside RAM for the PC environment, if necessary

minstall the Microsoft MS-DOS operating system (and Microsoft Windows if you wish)

minstall the additional DOS software that came with your DOS-compatible computer

minstall 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.

Troubleshooting in the PC Environment 111