The unit also has a new, lightweight keyboard and a universal power supply. The system board is the same as that of the IBM Personal Computer XT with 256Kb of memory that is expandable to 512Kb using the memory expansion option. Five expansion slots are available for the connection of most IBM Personal Computer options. The system has identical function and performance characteristics to an equivalently configured IBM Personal Computer.CGA graphics, 80 X 25 text. Two 360KB 5.25-inch disk drives. 1 parallel, 1 serial, CGA video. IBM PC-DOS Version 2.10 (disk). The item "IBM PORTABLE PERSONAL COMPUTER MODEL 5155" is in sale since Thursday, May 31, 2018. This item is in the category "Computers/Tablets & Networking\Vintage Computing\Vintage Manuals & Merchandise". The seller is "snapandsnap" and is located in Macleay Island, QLD. This item can be shipped worldwide.