Apple Mac

"Macintosh 128-512K.. hello Mac"

Released in January 1984, the 128K is the original Apple Macintosh personal computer. The Macintosh features the 680000 CPU from Motorola, a GUI, and bundled with MacPaint and MacWrite.

• The Macintosh 128K was sold for $2,495 ($6,950 in today’s money)
• The 128K Sold over 70,000 units, and the 512K sold much more

MAC AT A GLANCE

• Mac OS 1.0 with GUI (Graphical User Interface)
• 9-inch integrated CRT monitor (monochrome)
• Motorola 68000 CPU running at 7.8336 MHz (effective clock rate of 6.0 MHz)
• 128 KB of RAM (upgradable to 4 MB via third parties)
• 64 KB ROM chip
• 400 KB, single-sided 3.5-inch floppy disk drive from Sony
• Included a mouse in the basic configuration

Operating System

The Macintosh 128K came with MACOS 1.0, known as "System 1.0". There were three OS upgrades before it was discontinued.

• GUI Operating System
• Not software-compatible with the Mac XL (Lisa)
• MacPaint and MacWrite were included with the Mac
• Other available software included the Microsoft Word, MacProject, and MacTerminal
• Programming languages included MacBASIC and MacPascal
• The Microsoft Multiplan was only running on the 512 KB model

Colors & Graphic Modes

• only 2 colors
• 512 × 342 pixels resolution

Sound Capabilities

The MAC offered an internal speaker generating 8-bit monaural sound.

• 8-bit Pulse-width sound driver (2 TTL chips)
• Sampled at 22.25 kHz
• Sound amplification (2 analog chips)
• Internal speaker

I/O Ports

The MAC offers 2 RS-422 serial ports (for devices such as printers and modems), plus the ability to add an external drive.

• 2 x RS-422 (non-standard) DE-9 serial ports
• Proprietary connector (19-pin D-sub) for an external floppy drive

Expansions & Upgrades

There were several upgrades from third parties:

• Up to 4 MB of RAM (even for MAC 128K)
• Internal SCSI hard drive (20 MB)
• External SCSI port
• 68881 FPU at 16 MHz
• 68020 CPU at 16 MHz accelerator
• Cooling fan

Related Models: The Macintosh 512K

The Macintosh 512K was released in September 1984, and it was sold for $3,195 ($8,900 in today’s money). The 512K is practically the same computer with the 128K, offering more memory. The 512K can be upgraded to Mac OS 4.1.

• 512 KB of RAM
• Mac OS 1.0 and up to 4.1

■ Macintosh 128/512K

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