Description: Apple III: Specifications (Discontinued 9/85)
Header: Apple III: Specifications (Discontinued 9/85)

 Article Created: 14 March 1991

 Video Display
 -------------
 Text and graphics may be displayed simultaneously.  Using graphics commands
 you can display either of two screen buffers.

 Graphics modes:
 * 280 x 192, 16 colors (with some limitations)
 * 280 x 192, monochromatic; -140 x 192, 16 colors
 * 560 x 192, monochromatic
 * All Apple II modes (in emulation)

 Text modes:
 * 80-column, 24-line monochromatic
 * 40-column, 24-line, 16-color foreground and background
 * 40-column, 24-line monochromatic

 All text modes have a software-definable 128-character set (uppercase and
 lowercase) with normal or inverse display.

 Central Processing Unit (CPU)
 -----------------------------
 The custom-designed microprocessor circuitry of the Apple III uses the
 6502B as its major component.  Other circuitry provides extended
 addressing capability, relocatable stack, zero page, and memory mapping.
 * Type: 6502B
 * Clock Speed: 1.4 MHz average; 1.8 MHz max
 * Operations per Second (8-bit): up to 750,000
 * Data Bus: two 8-bit formats, combined for extended addressing
 * Address Bus: 19 bits
 * Address Range: 262,144 bytes (256K)
 * Registers:
  Accumulator (A); Index Registers (X,Y): Stack Pointer (S); Program
  Counter (PC); Environmental Register (E); Bank (B); Zero Page (Z);
  Processor Status (P)

 Memory
 ------
 * 256K dynamic RAM
 * 4K ROM (initialization and self-test diagnostics)

 SOS (Sophisticated Operating System)
 ------------------------------------
 SOS handles all system I/0 and can be configured to handle standard or
 custom I/0 devices and peripherals by adding or deleting "device drivers."
 All languages and application programs access data through the SOS file
 system.

 Keyboard
 --------
 * 61 keys on main keyboard
 * 13 keys on numeric keypad
 * Full 128-Character, ASCII encoded
 * All keys have automatic repeat
 * Four directional-arrow keys with two-speed repeat
 * Two user-definable Apple keys
 * Seven other special keys: Shift, Control, Alpha Lock, Tab, Escape,
  Return, Enter.

 Storage Devices
 ---------------
 * One built-in 5.25-inch, floppy-disk drive, 140K (143,360 bytes) per
  diskette
 * You can connect three additional drives by daisy-chain cable (total:
  560K on-line storage)
 * You can add up to four ProFile hard-disk drives (5MB each) with plug-in
  interface cards

 Video Output
 ------------
 * RCA phono connector for NTSC monochromatic composite video
 * DB-15 connector for:
  * NTSC-color composite video
  * NTSC monochromatic composite video
  * RGB color video
  * Composite sync signal
  * Power-supply voltages
 * Color signals appear as 16-level grey scale on monochromatic displays

 Audio Output
 ------------
 * Built-in two-inch speaker, miniature phono jack on back panel
 * Driven by 6-bit D/A converter or fixed frequency "beep" generator

 Serial (Printer/Modem) Port
 ---------------------------
 * RS-232C compatible, DB-25 female connector
 * Software-selectable baud rate and duplex mode
 * You can use one port for the Silentype printer.

 Expansion Ports
 ---------------
 * Four 50-pin expansion slots (fully buffered, with interrupt and DMA
  priority structure)
 * Joystick/Silentype Ports: Two DB-9 connectors

 Languages Available
 -------------------
 * Apple Business BASIC
 * Apple Ill Pascal
 * Apple III COBOL

 Emulation Mode
 --------------
 This mode provides hardware emulation of 48K Apple II Plus. It can run most
 Apple II programs, with the exception of Pascal and FORTRAN, without
 modification.

 Electrical Specifications
 -------------------------
 Plug the Apple III's power cord into a three-wire 110-120 VAC outlet.  The
 Apple III meets the following agency regulations:
 * UL 114, Office Appliances and Business Equipment
 * CSA 22.2, No. 154-Data Processing Equipment

 Physical Specifications
 -----------------------
 * Height: 4.8 in. (12.20 cm)
 * Depth: 18.2 in. (46.22 cm)
 * Width: 17.5 in. (44.45 cm)
 * Weight: 26 lb. (11.8 kg)
 Copyright 1991, Apple Computer, Inc.
 Keywords:  SPECSHT