The Macintosh IIsi Was Released in October 1990 by Apple as the low end of the Macintosh II series. It has a 20mhz 68030, 2mb of RAM Stock expandable to 64, an a 40 or 80mb SCSI hard disk. The IIsi supports System 6.0.7 to 7.6.1. Its PDS card can accept 030 PDS cards from the SE/30 or IIci or the Apple PDS to Nubus adapter which adds a FPU and Nubus slot for Ethernet, video, sound, and other adapters. The IIsi retailed for $ 2999 in 1990. It was discontinued in March 1993.