Inside the Macintosh 128K

The Macintosh 128K

In Figures 5 and 7 you have an overall look of the Macintosh 128K. The Macintosh 128K had a brightness adjustment button on its front panel, below the Apple logo.

Macintosh 128KFigure 5: The Macintosh 128K

Macintosh 128KFigure 6: The brightness adjustment

The easiest way to detect that this is the original Macintosh from 1984 is that it only has “Macintosh” written on its back or “Macintosh 128K” on models manufactured after September of 1984. The Macintosh 512K had “512K” written on its back, and the successor to the 512K, the Macintosh Plus, had “Macintosh Plus” written on the front panel.

On the rear panel, the computer had a compartment for you to install a 4.5 V battery (known as TR133R, NEDA 1306A, 523, etc.) in charge of keeping the computer’s real time clock hardware working when the computer was turned off. Notice that this battery has the same physical size of a AA battery, but it is different (4.5 V vs. 1.5 V).

Macintosh 128KFigure 7: The Macintosh 128K

At the bottom part of the rear panel, the Macintosh 128K had a proprietary mouse port, a port for the installation of an external floppy disk drive, a serial port for a printer, a serial port for an external modem, and a 3.5 mm jack for an external speaker. The Macintosh 128K had an internal speaker as well.

Macintosh 128KFigure 8: The rear connectors

It is interesting to note that while the serial port used on the PC used a male connector, the serial port used on the Macintosh used a female connector.

Author: Gabriel Torres

Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.

Share This Post On
Subscribe To Our Newsletter

Subscribe To Our Newsletter

Join our mailing list to receive the latest news and updates from our website.

You have been added to our newsletter!