MS-DOS It was really the floppy disks that I got tired of — rather than actually running out of real memory. Thus, my upgrade to an IBM XT-compatible with a 20meg hard drive was like sheer heaven to me. Oh, and that 8mHz Turbo button seemed like pure genius.
IBM OS/2 &MS Windows 3.1 I outgrew that 20meg hard drive long before I finally bit the bullet and bought an IBM AT-compatible computer. I went for a full tower this time because I had also outgrown the expansion slots. I was also tired of command-line prompts (CP/M was the same way) and DOS-SHELL, but I wasn't overly impressed with "Windows" either. OS/2 was getting a lot of fanfare, at the time, so I went with a 33mHz (turbo), 16meg real, and 128meg storage system (later, I had to add a second 320meg drive). Wow! Who could want more?
MS Windows'95 & '98 Before I retired, I ran on a 450mHz, 192meg real, and 11gig storage system which is peer-to-peer networked with two other personal computers — and we're talking about my home here!