Apple  Apple II c
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Apple IIc

The Apple IIc is the fourth model in the Apple II series of computers. It is Apple's first attempt to design a portable computer. At 7.5lbs, today it would be considered luggable rather than portable. The "c" in the name stood for compact. The case was smaller, and had venting slots on top, so it could no longer support a monitor. Apple provdied a separate stand for that.

The IIc used a new CMOS-based 65C02 CPU that had 27 more instructions over the 6502. Unfortunately some software used undocumented instructions on the 6502, that were not carried over in the design for the 65C02, resulting in incompatibilities.

The text display of the IIc added 32 unique characters that could be combined to create simple icons, windows and menus so a simple Graphical User Environment could be simulated out of text characters.

MOS 6502 CPU

The 6502 is an 8-bit MicroProcessor designed by MOS Technology. The team was led by Chuck Peddle and had also worked on the Motorola 6800. The 6502 is a simplified, but faster and cheaper design than the 6800.

The 6502 was introduced in 1975 and was the cheapest microprocessor on the market. Together with the Zilog Z80, the 6502 helped start the home computer revolution of the 1980s. The 6502 was used in a wide range of devices: the Atari 2600, the 8-bit Atari home computers, the Apple II, the Nintendo Entertainment System, the Commodore 64, the BBC Micro and many others. All used the 6502 or a variation of it.

The 6502 is a 1MHz design, while the 6502A is designed for 2MHz. The 6502A is 100% compatible with the original 6502.

Commodore soon bought MOS Technology, but conitnued to sell the microprocessor to competitors and licensed the design to other manufacturers.

Source: WikiPedia - MOS Technology 6502
Technical Details
Released 1983 Brand Apple Type Apple Series II Name Apple II c CPU Class 650x CPU MOS/Synertek 6502 @1.023MHz, NCR/GTE 65C02 @1.023MHz (Enhanced IIe) Memory RAM: 64kB
RAM max: 1MB
Sound Chip none Sound 1-bit sound Display Chip none Display 80x48 16 colors
560x192 16 colors
Best Text 80x48 Best Color 16 colors Best Graphics 560x192 in 16 colors Sprites none System OS Apple DOS Storage Internal Disk Drive Original Price $1300
Related Systems
Apple Series I
Apple Series II
Apple II  c (1983)
Apple Series III
Apple Macintosh
Apple Macintosh II
Apple Macintosh LC & Quadra
Apple Newton
Related Media
6502 CPU
Collection of books on the 6502 and compatible CPUs
Apple Macintosh
Books about the Apple Macintosh, the first mass-market personal computer with a graphical user interface.
InCider and A+
InCider Magazine for Apple Computers, later fused with A+
The 6502/6809 Journal
Peeker Magazine
Peeker, a German language magazine for Apple Computer users.
World Wide Web Links
MOS 6502 CPU Wiki Page
The 6502 is an 8-bit MicroProcessor designed by MOS Technology.