This is a working vintage IBM Model 5155 Portable Personal Computer from the mid-1980s, upgraded with 512kb of memory, onboard DOS operating system and storage. This model boots and functions completely fine, with a working keyboard and display. The OS appears to be onboard, as it boots and launches the OS fine without any additional diskettes. No additional diskettes included. This model is in overall great condition with minimal wear to the case and a functional operating system included.