Mac OS 7.6.1, otherwise known as System 7.6.1, came out a few months after Mac OS 7.6. It was a system update that was, mainly, 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 6 full years. As of 2011, the Mac OS X era surpassed it by the 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.)