How Fast Was the CPU in the Original IBM PC?
Answer: 4.77 MHz
The original IBM PC, model number 5150, was introduced in August 1981 with a 5.25″ floppy disk or cassette system, and a 4.77 MHz Intel 8088 CPU. The maximum amount of RAM was 256kb, though they were usually sold with either 16 or 64 KB. You could also upgrade your processing power by adding an Intel 8087 math processor for floating point arithmetic.
The unit had a CGA video card that could be hooked up to an RGB monitor, or even hooked up to a television instead–interestingly, you could add more than one video card and use two monitors at the same time. For instance, applications like AutoCAD would let you use a color monitor for graphics and a monochrome monitor for text menus. Image from Wikipedia