Apple Macintosh LC 630 DOS - Manual (Page 126)

When I switch to the PC environment, I see this message: “Non-system disk or disk
error. Replace and strike any key when ready.”
The DOS-compatibility hardware can’t find DOS.
Switch to the Mac OS by pressing x-Return, open the PC Setup control
panel, and make sure drive C is mapped to a drive container. If not, follow the
instructions under “Configuring Drives C and D” in Chapter 6.
If drive C is mapped to a drive container, it may not be the drive container
that holds DOS. If other drive containers have been created, double-click each
one in the Mac OS and look for DOS folders and files. If you locate a
container with DOS in it, map it to drive C.
If no drive container exists, the PC software may not be installed. First, create
a drive container by following the instructions under “Configuring Drives
C and D” in Chapter 6. Then follow the instructions under “Reinstalling PC
Software” in the section “Reinstalling the DOS-Compatibility Software” later
in this chapter.
I’m running applications in both environments and they seem sluggish.
You may be sharing Macintosh RAM with the PC. Performance may improve
if you give the PC environment its own memory by installing a SIMM
(memory module) on the DOS-compatibility card in your computer. For
instructions, see Appendix B.
Additionally, significant drive access in one environment (including file
sharing) can cause a slowdown in the other.
There is a delay when switching between environments.
When switching would interfere with a Mac OS system task, there is a slight
delay until the task is completed.
There also may be a delay while clipboard information is transferred between
the two environments. (If there’s a large amount of information on the
clipboard, you may actually see the translator window.)
If Shutdown Warning is turned on in the General Controls panel in the Mac
OS, you cannot switch back to the Mac OS immediately after switching to the
PC. Wait a few minutes and try switching again. To fix the problem, open the
General Controls panel in the Mac OS and turn off the Shutdown
Warning option.
115 Troubleshooting in the PC Environment