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Apple //c


Experienced Member
Dec 26, 2011

The Apple //c was manufactured by Apple Computer, Inc. from April 1984 to August 1988. It was the fourth in the Apple II line, and it was Apple Computer's first attempt to create a portable computer system. The IIc was the first system to use Apple's Snow White Design scheme, which was used in later Apple computers such as the Macintosh.

The Apple //c had improvements over the Apple IIe, such as:

  • The new CMOS-based 65c02 processor
  • Twenty-seven new processor opcodes
  • Fixes to the IIe ROM that allowed Applesoft BASIC to work with lowercase characters and an 80-column display
  • Mousetext display characters that allowed the creation of graphical user interfaces from text

The Apple //c had no expansion slots, which was a drawback. However, it had most popular cards built-in, including an Extended 80 Column Card, two Apple Super Serial Cards, a Mouse Card, and a floppy drive controller card. It also had a built-in 5.25" floppy disk drive, a new feature in the Apple II line.

Technical specifications (from Wikipedia:)

  • Microprocessor
    • 1.023 MHz 65c02
    • 8-bit data bus
  • Memory
    • 128 KB RAM built-in
    • 32 KB ROM built-in (16 KB in Rev0)
  • Expandable from 128 KB to 1 MB (Rev1 and later, or with 3rd party expansion board)
  • Video
    • 40 an 80 Columns text, 24 lines
    • Low-Resolution: 40 x 48 (15 colors)
    • High-Res: 280 x 192 (6 colors)
    • Double Low-Res: 80 x 48 (15 colors)
    • Double High-Res: 560 x 192 (15 colors)
  • Audio
    • Built-in speaker, 1-bit toggling
    • User adjustable volume (manual dial control)
  • Built-in storage
  • Slim-line internal 5.25" floppy drive (140 KB, single-sided)
  • Internal connectors
    • Memory Expansion Card connector
  • Specialized chip controllers
    • IWM (Integrated Wozniak Machine) for floppy drives
    • Dual 6551 ACIA chips for serial I/O
  • External connectors
    • Joystick/Mouse (DE-9)
    • Printer, serial-1 (DIN-5)
    • Modem, serial-2 (DIN-5)
    • Video Expansion Port (D-15)
    • Floppy drive SmartPort (D-19)
    • 12-Volt DC connector input (DIN-7, male)
    • NTSC composite video output (RCA connector)
    • Audio-out