[WoodenChair]

For the record, my Performa 6116CD which shipped with 7.5 had a 60 MHZ PPC 601 and 8 MB RAM. It could run on significantly less than that as well - in fact I believe it ran as far back as on some 80s machines.

[barclay]

Yup. I had an LC520 (25 MHz 030--not that far back from your 6116) that ran 7.5.x.

[Moto7451]

7.5.5 was the last version that ran on the Mac Plus, SE, Classic, and various other 8MHz 68000 Macs.

[Tloewald]

Right but it ran System 7.0.x.

System 7.5 had OpenDoc, so it ran in two modes: fast, light, and stable, OR with OpenDoc.