This is because everything was in one box, including a 5 "screen that can show 16 lines of 64 characters.
The 5110 has 2 models. The first model includes a tape recorder and the second model operates exclusively through the IBM 5114, a small refrigerator-sized device with 2 8 "floppy drives in it. This is also visible in the museum.
The operating system is APL or BASIC.
Although it is also from the 5100 series, like the later IBM Personal Computer (5150) and successors, the IBM 5100, 5110 and 5120 have a completely different architecture than the later PCs. The design of the cabinets and the idea that it could be used at home are the similarities.