The '''Macintosh IIx''' wasis introduceda [[personal computer]] designed, manufactured, and sold by [[Apple Inc.|Apple Computer, Inc.]] infrom 1988September 1998 to October 1990. This model was introduced as an incremental update ofto the original [[Macintosh II]], model. It replacedreplacing the 16 MHz [[Motorola 68020]] CPU and [[68881]] FPU of the II with a [[Motorola 68030|68030]] CPU and [[68882]] FPU running at the same clock speed;. andtheThe 800 KB [[floppy disk|floppy drive]] was replaced with thea 1.44 MB [[SuperDrive]], (the first Mac[[Macintosh]] to include this as standard).<ref name=macworldsecrets>{{cite book
}}</ref> The initial price of the IIx was {{US$USD|7769|1988}} or {{US$USD|9369|1988}} for a version with the 40 MB hard drive.<ref name="bwire">{{cite web|last1=Cook|first1=John|last2=Cochrane|first2=Carol|title=Apple Announces 68030 Macintosh IIx With High Density Compatible Drive|url=http://tech-insider.org/mac/research/1988/0919.html|publisher=Business Wire|date=September 19, 1988}}</ref>
The Mac IIx included 0.25 KiB of L1 instruction [[CPU cache]], 0.25 KiB of L1 data cache, a 16 MHz bus (1:1 with CPU speed), and supported up to System 7.5.5.
