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DISCUSSION 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) EXTENDED Information section - Apple Internal Use - Service Providers and Support Professional APPLE EYES ONLY Information section - Apple Need-To-Know Confidential Article Change History: |
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