We hate 2020!

Just when we thought 2020 couldn't get any worse! We were about to re-open after many months of being closed but then disaster struck when a mains water pipe burst and flooded much of the ground floor of the museum.
Sadly re-opening has now been postponed. Read More >>>

Please Donate Via Just GivingNo visitors, no workshops, no events, no school visits... no income. We know that things are tough for everyone right now, but if you can afford to help us through these tough times please donate what you can.

There's over 36,000 exhibits here! That should keep you occupied for a bit - get searching!

Or come and get involved on our social media channels ...

      Twitch  Facebook          Online Gift Shop      

Thank you.

Apple Macintosh 512k

The Macintosh 512K Personal Computer, the second of a long line of Apple Macintosh computers, was the first update to the original Macintosh 128K. It was virtually identical to the previous Mac, differing primarily in the amount of built-in memory (RAM), which quadrupled the original's. This large increase earned it the nickname Fat Mac. The additional memory was significant because more ambitious users with computer experience stretched the capacity of the original Mac almost immediately, despite the limited number of applications.

Like the 128K Macintosh before it, the 512K contained an 8 MHz Motorola 68000 connected to a 512 KB DRAM by a 16-bit data bus. Though the memory had been quadrupled, it could not be upgraded. A 64 KB ROM chip boosts the effective memory to 576 KB, but this is offset by the display's 22 KB framebuffer, which is shared with the DMA video controller. It shared a revised logicboard with the re-badged Macintosh 128K (previously just called the Macintosh), which streamlined manufacturing.

It sold for $3,195, and was replaced in April 1986 by the 512Ke


CPU: Motorola MC68000
CPU Speed: 8 MHz
Bus Speed: 8 MHz
Data Path Width: 16 bit
Address Width: 16 bit
ROM: 64 kB
Onboard RAM: 512 kB
Maximum RAM: 512 kB
Level 1 Cache: 0.5 kB

Power: 60 Watts
Dimensions: 13.6" H x 9.6" W x 10.9" D
Weight: 16.5 lbs.

Manufacturer: Apple
Date: 9th October 1984

Comment on This Page

Apple Macintosh 512k Manuals:

Item Manufacturer Date
SuperPaint 1.1 Manual Silicon Beach Software 1988

Other Systems Related To Apple Macintosh 512k:

Item Manufacturer Date
Apple Macintosh M0001 128K upgraded to 512K Apple 28th January 1984
Mac Mini A1103 Apple Computers 22nd January 2005
Mac Mini A1176 Apple Computers 28th February 2006 to 6th September 2006

This exhibit has a reference ID of CH6093. Please quote this reference ID in any communication with the Centre for Computing History.


Apple Macintosh 512k

Click on the Image(s) For Detail


Help support the museum by buying from the museum shop

View all items

Founding Sponsors
redgate Google ARM Real VNC Microsoft Research
Heritage Lottery Funded
Heritage Lottery Fund
Accredited Museum