John wrote: > Looks exactly like the RL02 cartridge, > wonder who made it? IIRC, the RL02 cartridge and many other similar looking ones are based on the CDC 5440 cartridge design, but are not necessarily interchangeable with it or with each other. Just as many of the 2.5 and 5 MB cartridges are based on the IBM 2315 design, but are not necessarily interchangeable with it.