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John Neil & Associates
P.O. Box 2156
Cupertino, CA 95015  USA
Orders:
E-Mail:
	Web Site:
(800) 663-2943
(415) 661-2944
sales@jna.com
http://www.jna.com
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68LC040 CPU Bug Information
	John Neil
April 23, 1996
68LC040 CPU Chip Bug
VThe 68LC040 CPU chip has a bug in it which prevents many FPU applications from working
H_properly with SoftwareFPU.  The bug is confirmed by Motorola and listed as bug E4 on revision 4
`of the official Motorola 68LC040 errata sheet.  Unfortunately there is no way for SoftwareFPU to
Ywork-around this bug.  If you have SoftwareFPU installed on a 68LC040 Macintosh, you will
`have to test each FPU application you use to see whether it will work on your Macintosh.  If the
`application crashes, it is probably due to the 68LC040 CPU chip bug.  To verify the cause of the
ecrash, test the same application on a regular 68040 Macintosh.  If the application operates correctly
Uon a 68040 Macintosh, the CPU bug is causing the application to crash on your 68LC040
`Macintosh.  If the application crashes on a 68040 Macintosh, the CPU bug is not the cause of the
68LC040 crash.
UIf your FPU application crashes with SoftwareFPU because of the 68LC040 CPU bug, your
options are:
  Replace the application with a version that does not require an FPU, if available.
  Replace the 68LC040 CPU in your Macintosh with a 68040 CPU that contains a hardware
HYFPU.  John Neil & Associates sells 68040 upgrades for desktop Macintoshes and PowerBooks.
WSee the price list at the end of the "About SoftwareFPU" document for more information.
  Install a PowerPC upgrade card in your computer.  FPU applications work properly with
H#SoftwareFPU on PowerPC Macintoshes.
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John M. Neil
John M. Neil
Microsoft Word
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