Mac OS 7.6.1

 Mac OS 7.6.1, was released on April 7, 1997, a few months after Mac OS 7.6. It was a system update that comprised mainly of a collection of bug fixes.

Mac OS 7.6.1 removed a host of obscure patch files and integrated them into the OS. Amongst those include:


 * 54xx/64xx Update
 * 7.5.5 SCSI Server
 * Assistant Toolbox
 * PCI Network Legacy
 * PowerBook 1400 ATA
 * PowerBook 1400 PMU Updater
 * PowerBook VM Tuner for OS 7.6
 * PowerMac Format Patch
 * PowerPC Interrupt Extension

Mac OS 7.6.1 finally ended, after 13 released updates, up to 3 Tune-Ups, 2 model-specific updates, 3 revisions, one cancelled update, and 8 Performa-only updates, the System 7 era, which lasted the better part of six full years. As of 2011, the Mac OS X era surpassed it by a number of years.

(The existence of the succeeding Mac OS 7.6.3 is still disputed and has not been included in the enumeration above.)