IBM 5110 Computing System

The IBM 5110 Computing System was the successor of the IBM 5100 Portable Computer.

Three variations of the IBM 5110 were built:

IBM 5110 Model 1 (with a built-in QIC DC300 tape drive of 204 kB).
IBM 5110 Model 2 (without the QIC tape drive).
IBM 5110 Model 3 - also designated as the IBM 5120 (with two built-in 8 inch 1.2 MB floppy disk drives).
The IBM 5110 was announced in January 1978 (3 years after the introduction of the IBM 5100). Its main differences were support for more I/O devices (floppy disk drives, IEEE-488, RS232, ...) and a character set (EBCDIC) which was compatible with other IBM machines. These improvements made it partially incompatible with the IBM 5100.