Performa 640, LC 630 DOS Compatible: Error 003 and 005

The Macintosh Performa 640 and LC 630 DOS Compatible computers use the Cyrix 486 DX2 Processor in the DOS Environment. With this processor, the computer has a Write Back feature enabled in the AUTOEXEC.BAT with the line:

C:\\APPLE\\WB.EXE \\

This allows the processor to write to the hard drive in the background while the user is performing other tasks.

However, the PRO_ORG.EXE program appears not to be compatible with the Write Back feature, which causes these errors. You should contact the developer of Sound Blaster, Creative Labs, for additional information.

In the interim, the workaround is to disable the Write Back feature, which may decrease performance.

To disable the Write Back feature, follow these steps:

1. Edit the AUTOEXEC.BAT file

EDIT AUTOEXEC.BAT

2. Remark the line: C:\\APPLE\\WB.EXE

To look like this: REM C:\\APPLE\\WB.EXE

3. Save the changes and exit EDIT

4. Switch to the Mac Environment

5. Go to the PC Setup control panel

6. Select Shut Down PC

7. Select Restart PC
Now the PRO_ORG.EXE program should work.

Note: PC Setup 1.5 enables the Write Back feature and offers no way to turn it off. Apple is investigating a solution to the issue for those who need the use of the FM Pro Organ. This can also affect Power Macintosh 6100 computers with the DOS Compatibility Card.