Apple IIgs


At A Glance

Apple IIgs

The Apple IIGS was the most powerful of the Apple II line of machines. The GS (which stood for Graphics and Sounds) was a radical advance from previous models with advanced color graphics, sound and music synthesis, 16-bit architecture and a mouse.Read the original specs over at the Apple support site.

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Original Specifications


  • Central Processing Unit (CPU)
    • Microprocessor: 65C816
    • Clock speed: 2.8 or 1.02 megahertz; user- or software selectable
    • Address bus: 24 bits
    • Data bus: 8 bits
    • Address range: 16,777,216 bytes
    • 16-bit registers: accumulator, two index registers, direct register, stack pointer, and program counter
    • 8-bit registers; data bank, status
    • Addressable memory: up to 8MB of ROM
  • Memory
    • 1MB RAM, expandable to 8MB
    • 256K ROM, expandable to 1MB (ROM revision 03)
  • Text Display Modes
    • 40 columns by 24 lines
    • 80 columns by 24 lines
  • Graphics Display Modes
    • 320 dots horizontally by 200 dots vertically, in up to 16 colors per screen, from a palette of 4,069 colors
    • 640 dots horizontally by 200 dots vertically, in 4 or more colors per line and 128 colors per screen from a palette of 4,096 colors.
    • Double-high-resolution (560 dots horizontally by 192 dots vertically; 16 colors)
    • Double-low-resolution (80 dots horizontally by 48 dots vertically; 6 colors)
    • High-resolution (280 dots horizontally by 192 dots vertically; 6 colors)
    • Low-resolution (40 dots horizontally by 48 dots vertically; 16 colors)
  • Sound Capability
    • An Ensoniq 32-oscillator digital synthesizer chip with dedicated 64K RAM:
    • Produces up to 15 voices simultaneously.
    • Uses external speaker or headphones via audio output jack (volume is set through the Control Panel).
  • Character Sets
    • 32 letters (uppercase and lowercase), 32 special characters, 32 MouseText characters, and 12 unique characters for each of these international character sets: U.S., U.K., French, Danish, Spanish, Italian, German, and Swedish.
  • Keyboard
    • Standard typewriter-style
    • 80 keys, plus 14 key numeric keypad
    • Two Apple Desktop Bus (ADB) connectors (one for attaching the keyboard tothe computer; one for daisy-chaining additional input devices)
    • Keyboard layouts, selectable through the Control Panel: QWERTY (Sholes), Dvorak, Nine international (all those listed under Character Sets, plus French Canadian)
  • Interfaces
    • One multipurpose RAM/ROM memory expansion slot
    • Seven general-purpose input/output slots for peripherals control cards, all fully buffered, with interrupt and DMA priority
    • Serial ports: two 8-pin minicircular connectors (either can be used to connect AppleTalk devices); utilize SCC communications chip
    • Disk drive port: one 19-pin D-style connector (allows daisy-chain connection of up to four Apple 3.5, Apple 5.25, or UniDisk disk drives)
    • Video output Analog RGB, via 15-pin D-style connector Composite color, via RCA phone connector
    • Apple Desktop Bus port; one 4-pin mini-circular connector on back of computer
    • Game I/O: 9-pin D-style connector for joysticks, graphics tablet, and similar devices
    • Audio: RCA mini headphone/speaker output jack with programmable volume control
    • Input/Output connector on main logic board
  • Operating Systems Supported
    • GS/OS
    • ProDOS 16 and ProDOS 8
    • Pascal
    • DOS 3.3
    • CP/M (with appropriate co-processor card)
  • Other Features
    • Real-time clock (set through Control Panel)
    • Battery backup for Control Panel settings
  • Electrical Requirements
    • Line voltage: 107 to 132 volts AC; 50 to 60 hertz
    • Power consumption:
    • Typical: 11 watts
    • Maximum: 60 watts
    • Supply voltages: +5 volts (+/- 3%)
    • +12 volts (+/-6%)
    • -5 volts (+/+/-10%)
    • -12 volts (â–’10%)
    • * Maximum supply currents:
    • +5 volts: 2.5 amps
    • +12 volts: 1.5 amps
    • -5 volts: 250 milliamps
    • +12 volts: 250 milliamps
  • Environmental Requirements
    • Operating temperature: 32 to 113 degrees F (0 to 45 degrees C)
    • Maximum temperature on power supply case: 130 degrees F (55 degrees C)
    • Relative humidity: 5% to 85%
  • Safety and EMI Qualifications
    • FCC Part 15 Class B Computing Devices
    • CSA 22.2, NO. 154-1979
    • UL 114 – Office Appliances and Business Equipment
  • Dimensions and Weight (main unit only)
    • Height: 4.6 in. (11.7 cm)
    • Width: 11.2 in (28.4 cm)
    • Depth: 13.7 in. (34.8 cm)
    • Weight: 8.72 lb. (3.96 kg)



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