Baby Blue is a single-board microcomputer which enables the IBM Personal Computer to run programs written for the CP/M-80 operating system. Although small enough to fit in a single expansion slot, it contains a high-speed Z-80B microprocessor and a full 64 Kilobytes of memory, making it actually more powerful than most first-generation microcomputers.

"Baby" connotes a symbiosis in which Baby Blue handles CP/M-80 code written for the Z-80, while depending on the the host PC's 8088 microprocessor to manage "life support" (operating system) functions - keyboard, screen, disk drives, printers, etc. The closeness of this "mother-child" relationship is Baby Blue's unique strength; you get dual operating system capability under PC-DOS alone, not the hassle of maintaining two separate operating systems.