|Release date||July 29, 1993|
|Media||1.44MB 3½-inch floppy disks|
|Operating system||IBM DOS 5.02 or 6.1, Windows 3.1, OS/2|
|CPU||IBM 486SLC2 clock doubled 50/25MHz processor|
|Storage||120-340MB hard drive|
|Input||Track Point II Keyboard, Mouse (optional), Touch screen|
|Dimensions||304.8 x 304.8 x 69.6mm|
|Related articles||IBM Personal System/2|
The IBM Energy or PS/2E (IBM 9533) is an IBM Personal System/2 computer. It was the first Energy Star compliant personal computer. It features very low power consumption compared to other computers and made extensive use of recycled material during manufacture.
Its IBM 486SLC2 50/25MHz processor features 16 kilobytes of L1 [CPU cache], allowing the CPU to execute instructions at twice the 25MHz bus speed while required instructions and data reside in the cache. With an ISA bus, it accepts a single ISA option adapter. Depending on the sub-model number, it came supplied with either a special option adapter for four PC card PCMCIA slots, or as a diskless workstation with an ethernet or token-ring adapter.  Additional options included several PCMCIA cards, a color LCD screen, and a color LCD touch-screen with a special version of OS/2.
The environmentally friendly PC borrowed many components from the ThinkPad line and was composed of recycled plastics, designed to be easily recycled at the end of its life, and used very little power.
- Ohland, Louis. "9533 (PS/2e)". Retrieved 20 June 2014.
- "Personal Systems Reference IBM PS/2 1992 to 1995 - withdrawn". http://www.lenovo.com/psref/. IBM PC Institute. Retrieved 20 June 2014.