IBM 5120
| Manufacturer | IBM |
|---|---|
| Type | Professional Computer |
| Release date | February 1980 |
| Introductory price | US$13,500 (equivalent to $51,500 in 2024) |
| Media | 2 × 8-inch 1.2 MB floppy disk drives |
| Operating system | APL, BASIC |
| CPU | IBM PALM processor |
| Memory | 16–64 KB RAM (with 16 KB iterations) 64 KB ROM |
| Display | 9-inch CRT |
| Input | Keyboard |
| Weight | 45 kg (99 lb) |
| Predecessor | IBM 5110 |
| Successor | IBM Datamaster |
The IBM 5120 Computing System (sometimes referred to as the IBM 5110 Model 3) is a 16-bit microcomputer developed by IBM and released in February 1980. Marketed as the desktop follow-on to the portable IBM 5110 Computing System, it featured two built-in 8-inch 1.2 MB floppy disk drives, an integrated 9-inch monochrome monitor, 32 KB RAM, plus an optional IBM 5114 stand-alone diskette unit with two additional 8-inch 1.2 MB floppy disk drives.
The system was sold with both APL and BASIC languages in ROM, and provided a toggle switch on the front panel to select the language. APL allowed numerous business software written on IBM minicomputers to run on the 5120.