First computer in 1966 was a GE635 that ran either Multics or the Dartmouth operating system, with access via a telepyype with paper tape punch/reader. Then IBM System 360/370 with cards and, for the advanced, a IBM Selectric typewriter. A modern phone has more processing power and storage than those systems. Then on to the minicomputer era with DEC RT11 (realtime) and RSX-11 and RSTS (timesharing). 16 bit systems with lots of compilers, databases and system utilities. In the '70s/early '80s, we ran 50 students at a time on a 16 bit system with 512 KB of memory and 67 MB of disk. That drive was the size of a washing machine. And we got CRTs and even graphics terminals (Tektronix). For big systems, there was the Dec System 10/20 running Tops 10/20, a 36 bit system. Then came the Apple IIs, MS-DOS and CP/M systems. Wow, were they primitive. They had toy assembler languages, a simple version of Basic and Lotus 1-2-3. But you could see the potential. Like the minicomputer replaced the mainframes, the PCs replaced the minicomputer. In both cases, a big step backwards in sophistication to expand the audience. That time from '65 to '85 was a whirlwind of computer development. Yes, I am old.