"Oktagon" A508

SCSI 2 controller for the A500 which probably connects to the side expansion slot. RAM can also be added to the unit in steps of 2MB up to a maximum of 8MB via the use of 4Mbit ZIP chips. This unit also had two switches, one for turning off the additional RAM and the other for switching off the SCSI controller itself.

Thanks to Iggy Drougge, Giaste