# IBM PS/2 E

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The **PS/2 E** or **Energy** (IBM 9533) is a member of the [IBM](/source/IBM) [Personal System/2](/source/IBM_Personal_System/2) family of [personal computers](/source/Personal_computer) (PCs). It was the first [Energy Star](/source/Energy_Star)-compliant PC,[attribution needed] [consuming](/source/Power_consumption) very little power relative to other contemporary PCs, and made extensive use of recycled materials in its [enclosure](/source/Computer_case).

## Specifications

The PS/2 E featured an [IBM 486SLC2](/source/IBM_386SLC) microprocessor with a 16 KB [L1 cache](/source/CPU_cache) that ran at 50 MHz on a 25 MHz 16-bit [system bus](/source/System_bus) (the processor clock was [double](/source/CPU_multiplier) that of the system bus) instead of the 32-bit bus of a full 386 or 486 processor.[1] The processor's performance was dependent on the L1 cache containing the required instructions and data; there was no external L2 cache on the motherboard like on some other 486-based computers.

It featured an [ISA](/source/Industry_Standard_Architecture) bus for [input/output](/source/Input/output), which accepted a single ISA option adapter with the use of a riser card. Depending on the sub-model number, it came supplied with either a special option adapter for four [PC card](/source/PC_card) PCMCIA slots, or a [network interface card](/source/Network_interface_card) for [Ethernet](/source/Ethernet) or [Token Ring](/source/Token_Ring) networks for use as a diskless workstation.[2] Additional options included several PCMCIA cards, a color LCD screen, and a color LCD touch-screen with a special version of [OS/2](/source/OS/2).

The PC borrowed some components from IBM's [ThinkPad](/source/ThinkPad) [laptops](/source/Laptop): including the 1.44 MB [floppy disk drive](/source/Floppy_disk_drive) and the [hard disk drive](/source/Hard_disk_drive). Its enclosure was composed of recycled plastics, and was designed to be easily recycled at the end of its service life. The [power supply unit](/source/Power_supply_unit) maximum [power consumption](/source/Power_consumption) was 24 watts, and was completely passively cooled, and lacked a fan for that reason.[3]

## Design

The PS/2 E featured a full-sized internal PC speaker, two SIMM sockets, and an extended bank of memory soldered directly to the motherboard. It featured 1 MB of video memory for the onboard [XGA-2](/source/XGA-2) graphics adapter, which was attached to the ISA bus instead of the usual [MCA](/source/Micro_Channel_architecture) bus. Like all Personal System/2 computers, if a change in hardware is performed, the configuration must be updated with the use of the reference diskette (for example changing the memory size).

## References

1. Ohland, Louis. ["386 Upgrades"](https://www.ardent-tool.com/CPU/386_upgrade.html#IBM_SLC_DLC_BL). Retrieved 10 December 2024.

1. ["Personal Systems Reference IBM PS/2 1992 to 1995 - withdrawn"](http://www.lenovo.com/psref/pdf/ps2book.pdf). IBM PC Institute. [Archived](https://web.archive.org/web/20170624060741/http://www.lenovo.com/psref/pdf/ps2book.pdf) June 24, 2017 at the Wayback Machine. Retrieved 20 June 2014.

1. Ohland, Louis. ["PS/2 E"](https://www.ardent-tool.com/9533/). Retrieved 10 December 2024.

## External links

- [Image of a PS/2 E with its LCD screen](http://www.mcamafia.de/mycomp/images/pizzabox.jpg)
- [Image of a PS/2 E on its box](https://web.archive.org/web/20071019110156/http://www.nothingtodo.org/classiccmp/ps2e.jpg)
- [A page with some pictures of the PS/2 inside](http://www.walshcomptech.com/ps2/mod33.htm)
- [IBM Announcement Letter Number 193-226 dated July 29, 1993](https://ardent-tool.com/9533/193-226.txt)
- [IBM PC Institute - Personal Systems Reference - IBM PS/2 1992 to 1995 - withdrawn.](https://web.archive.org/web/20170624060741/http://www.lenovo.com/psref/pdf/ps2book.pdf)

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Adapted from the Wikipedia article [IBM PS/2 E](https://en.wikipedia.org/wiki/IBM_PS%2F2_E) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/IBM_PS%2F2_E?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.