[Yeo Kheng Meng] didn’t cheat by simply running MS-DOS on a modern PC, either: he tested the client on a real 1984 vintage IBM 5155 Portable PC. This semi-portable PC/XT model sports a 4.77 MHz ...

Mills, D. Q., and G. B. Friesen. Broken Promises: An Unconventional View of What Went Wrong at IBM. Boston, MA: Harvard Business School Press, 1996.