IBM PC - Hardware - Memory - 1501001 16KB Memory Expansion Kit (1501001) To upgrade memory on the PC system board up to 64KB. Item number: 1501001 Announcement date: 1981-08-12 Availability date: 1981-08-12 Announcement letter: 281-65 THE IBM PERSONAL COMPUTER From the announcement: Up to 64KB of memory can be plugged into the system board. This memory is available in 16KB increments and must be used to provide the first 64KB of memory. Page created: 2021-08-12 Page last updated: 2023-10-02