|Release date||April 14, 1986|
|Introductory price||$2000 US|
|Discontinued||September 1, 1987|
|Operating system||1.0, 1.1, 2.0, 2.1, 3.0, 3.2, 3.3, 3.4, 4.0, 4.1, 4.2, 4.3, 6.0-6.0.8|
|CPU||Motorola 68000 @ 8 MHz|
|Memory||512 KB (built-in)|
The Macintosh 512K enhanced (512Ke) was introduced in April 1986 as a cheaper alternative to the top-of-the-line Macintosh Plus, which had debuted three months previously. It was the same as the Macintosh 512K but with the 800K disk drive and 128K of ROM used in the Macintosh Plus. Like its predecessors, there was little room for expansion. Some companies did create memory upgrades that would bring the machine up to 2 MB or more. It is the earliest Macintosh model able to run System 6 OS. It is also the earliest Macintosh model that can be used as an AppleShare server, and with a bridge Mac, communicate to modern devices.
Originally, the case was identical to its predecessor, except for the model number listed on the rear bucket's agency approval label. It used the same beige-like color as well. But like the Macintosh Plus, at some point in 1987 the 512Ke adopted the standard Apple "Platinum" color, as well as exactly the same case-front design as the Plus (without the name), though keeping its original rear bucket. Later in its lifespan, the 512Ke was discounted and offered to the educational market, badged as the Macintosh ED (M0001D & later M0001ED).
The 512Ke shipped with the original short Macintosh Keyboard, but the extended Macintosh Plus Keyboard with built-in numeric keypad could be purchased optionally. A version of the 512Ke sold outside of North America only included the full keyboard and was marketed as the Macintosh 512K/800. Later, the larger keyboard would be included standard in North America as well.
Although the 512Ke included the same 128K ROMs and 800K disk drive as the Mac Plus, the 512Ke retained the same port connectors as the original Mac. For this reason, 512Ke users' only hard disk option was the slower, floppy-port-based Hard Disk 20, or similar products for the serial port, even though the 512Ke ROMs contained the "SCSI Manager" software that enabled the use of faster SCSI hard disks. Apple did point users to certain third-party products which could be added to the 512Ke to provide a SCSI port.
One further OEM[clarification needed] upgrade replaced the logicboard and the rear case (to accommodate the different port configuration) with that of the Macintosh Plus which essentially added built-in SCSI functionality and up to 4MB RAM. As Apple's official upgrades tended to command a premium, many third party manufactures offered add-on SCSI cards as well as RAM upgrades to achieve the same functionality. The new ROM allowed the computer to run much newer system and application software and though it loaded more data into RAM it only slightly decreased the amount of available memory by 1.5K, leaving well over 370K available for applications.
After June 1986, the 512Ke shipped with System 3.2. After it was discontinued, Apple changed the recommended OS for the 512Ke to System 4.1. System 6.0.8 is the maximum OS for the 512Ke.
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