Macintosh Performa 6400: System 7.5.3 Revision 2.1 (8/96)

I have a Macintosh Performa 6400/200 computer, and I noticed that in About This Macintosh, the system software version is "System 7.5.3 Revision 2.1". What is the difference between System 7.5.3 Revision 2 and System 7.5.3 Revision 2.1?


There were two changes to System 7.5.3 Revision 2 for the Macintosh Performa 6400/200 and 6400/180, which resulted in System 7.5.3 Revision 2.1.

The first is LocalTalk DMA 1.0.1, which resolves an issue with transferring files over LocalTalk.

The second change for System 7.5.3 Revision 2.1 is a fix for the video driver. This was to correct an issue with remaining screen bitmap artifacts when the computer was put to sleep when connected to a 15-inch display.

System 7.5.3 Revision 2.1 should only be used on the Performa 6400/200 and 6400/180 computers.


Article Change History:
dd mmm yyyy - Corrected product names.
Published Date: Feb 18, 2012