

Because all of these versions had relatively similar commands and controls, users could move between platforms with equal ease. WordStar was written with as few assumptions as possible about the operating system and machine hardware, allowing it to be easily ported across the many platforms that proliferated in the early 1980s.

Starting with WordStar 4.0, the program was built on new code written principally by Peter Mierau. Rubinstein was the principal owner of the company, and Rob Barnaby was the sole author of the early versions of the program. It was published by MicroPro International, originally written for the CP/M-80 operating system, and later written also for MS-DOS and other 16-bit PC OSes. It dominated the market in the early and mid-1980s, succeeding the market leader Electric Pencil. WordStar is a word processor application for microcomputers.

CP/M-80 (original on Intel 8080 and Zilog Z80)
