11-15 - Would like to work at a university (Score 1)

Let's see, there's CDC 3600 SCOPE, CDC 6500 SCOPE, the disk OS for the IBM 1800 (anyone remember what that was called?), OS/MFT, OS/MVT, Sperry OS/1100, DOS, Windows (16-bit, 32-bit, and NT/XP), MAC OS, and UNIX (SCO, ISC, Xenix, Linux, and flavors for the Alpha, Sparc, and 88k). That works out to one OS every three or four years, which seems like a reasonable replacement rate. I called that 11-15, even though I don't work at a university, because I did work at a university for some of the early ones.