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Released on June 1988 by Apple .


		Mar 87	System 4

		Jun 88	System 6.0
		19 Sep 88	System 6.0.1
			System 6.0.2
		7 Mar 89	System 6.0.3
		20 Sep 89	System 6.0.4
		19 Mar 90	System 6.0.5
			System 6.0.6
		15 Oct 90	System 6.0.7
			System 6.0.8

		May 91	System 7

Macintosh Plus tour from 1988

There were several computers having a complete GUI in their Read-Only Memory, ready to be used instantly after powering on. The list includes 1990’s Macintosh Classic (with built-in System 6.0.3), Atari ST (excluding very early editions of 520ST with TOS on a floppy disk) and Acorn machines with RISC OS.