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Macintosh 512Ke

Macintosh 512Ke

• The Mac Plus 128K ROMs!
• The 800K double-sided double-density disk drive!
Mac 512KThe Macintosh 512Ke has the same case description as the Macintosh 512K.

Mac 512Ke
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With an external floppy drive.

The Macintosh 512Ke can support only the HD20 hard drive directly. Third-party companies have created a SCSI add on board which will complete the transformation of the Macintosh 512Ke to a Macintosh Plus. The other way was to obtain an Apple upgrade kit which consisted of the Macintosh Plus logic board and new case (the back part only.) The motherboard is the same as the Macintosh 128K & Macintosh 512K, the memory chips are soldered on with no expansion capability.

The Macintosh 512Ke is used today yet for word processing, spreadsheets, telecommunications and the like. Third-party companies made a 4MB of memory upgrade (hard to find there nowadays) is enough to do meaningful tasks yet today! Even 512K is enough.

The only problem is you actually have less than 512K of RAM to use for applications than the Mac 512K. The 128K ROMS added extra stuff to put in memory upon boot up time. This won't keep you from working with the Mac 512Ke, just be aware that if you run of memory sooner, this is why.

  The box the Macintosh 512Ke was shipped in.

The disks and cassette tape that came with the 512Ke
Mac 512Ke disks and tape

Macintosh plastic box holding the diskettes, cassette tape and manual.

Back of the Mac 512Ke
The back of a Macintosh 512Ke, the same as a Macintosh 512K.

Apple's recommended System Software version: System 4.1 / Finder 5.5 (System Software 2.0.1)

For AppleShare use: System 3.3 and Finder 5.5 are installed by the AppleShare 1.1 Work Station Installer disk; System 3.4 and Finder 6.1 are installed by the AppleShare 2.0 Macintosh 512KE Work Station Installer disk. This machine can not be used as an AppleShare file server. If you have AppleShare 2.x the Mac 512Ke can become a printer server.

Below the software chart shows that the Macintosh 512K has a n/a for the AppleTalk Version. The Macintosh 512Ke can in fact support the AppleTalk network.

For telecommunications use: Can use 9600 baud modem or lower, anything higher may cause problems. Stock Macintosh cannot be placed on the Internet, Internet needs 4MB of RAM, possible with a memory upgrade.

Hard Drive use: Can use the Apple's HD20 - plugs into the floppy port. Or use any third-party hard drive which plugs into the modem port. Stock Macintosh 512Ke cannot use any SCSI hard drive.

Quick answers to your questions here!

Apple official specs


  • Introduced: 4/14/86
  • Discontinued: 9/1/87
  • Floppy Size: 800K
  • Internal HD: none none
  • Upgrade From: none
  • Upgrade To: Plus
  • Form Factor: 128
  • Weight: 16.5 lbs.

Logic Board

  • Main Processor: 8 MHz 68000
  • PMMU: none
  • FPU: none
  • Data Path: 8 MHz 16-bit
  • Secondary Processor: none
  • Slots: none
  • MIPS Rating: .7


  • Memory on Logic Board: 0.5MB
  • RAM Range: 0.5MB to 0.5MB
  • RAM Slots: 0 n/a
  • RAM Type: ns n/a SIMMs in groups of n/a


  • Built-in Display: 9" monochrome CRT
  • VRAM Configuration: built-in CRT
  • VRAM Speed: n/a
  • VRAM Expansion: built in
  • Color Bit Depth by Screen Resolution:
  • 512x384: 1-bit
    (1-bit = Black & White, 2-bit = 4 colors, 4-bit = 16 colors, 8-bit = 256 colors, 16-bit = thousands, 24-bit = millions)
  • The maximum color depth listed for 640x870 is 8-bit, reflecting the capabilities of the Apple 15 inch Portrait Display
  • Notes: Screen size is 512x342.


  • Sound In: none
  • Sound Out: mono, 8-bit
  • Microphone Port: none


  • ADB: none
  • Video: none
  • Floppy: DB-19 - Disk Drive Port: 500K baud
  • SCSI: none
  • GeoPorts:
  • Ethernet: none
  • Microphone Port Type: none
  • Ports: Printer Modem Speaker
  • Notes: The serial ports in this system do not support handshaking or synchronous modems.

Serial Port specs

  • AppleTalk: 230.4K baud
  • Asynchronous: 57.6K baud (maximum rate)
  • Synchronous: 920K baud (maximum rate with external clock)


  • Source: .5A 105-125V 50-60 Hz
  • Consumption: 60 W or 205.2 BTU
  • Battery Type: 4.5V alkaline, #523


  • Addressing Modes: 24-bit
  • Original System Software: 1.0
  • Original Enabler: none
  • ROM ID: $0075
  • ROM Version: n/a
  • ROM Size: 128K
  • AppleTalk Version: n/a
  • System Software Supported: 1.0 1.1 2.0 2.0.1 5.0 5.1 6.0 6.0.1 6.0.2 6.0.3 6.0.5 6.0.4 6.0.7 6.0.8

All technical information from

[ System Showcase ] [AppleTalk-ing ] [ Mac Resources ] [ Help ]
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