4825 SX (25-5141/42) Features Faxback Doc. # 1682 The Tandy 4825 SX delivers IBM PC/AT compatibility in a high-performance environment. It features a 25 MHz Intel i486SX microprocessor and a 32-bit CPU. You can run popular software packages with the industry-standard architecture (ISA) expansion options. Many advanced features are standard on the Tandy 4825 SX. These features and many options are listed below. NOTE: This manual contains information for both the 4825 SX and 4825 SX hard drive models. FEATURES 25 MHz Intel i486SX microprocessor--Provides superior performance with its 32-bit data path and 8KB internal cache. 8KB internal cache--Features an integrated 8 KB cache (CACHE482). This cache is organized in a 4-way set-associative design that greatly enhances the performance of many common applications. CACHE482 uses a write-through caching scheme to ensure data reliability. Phoenix BIOS and Industry Standard Architecture (ISA)--Ensures compatibility with software and hardware built to the IBM standard for PC/AT. Three 16-bit ISA expansion slots operate at a standard 8.33 MHz speed. MS-DOS,Novell,UNIX,XENIX, and MS OS/2 compatibility--Lets you choose the operating system that best supports your needs. 101-key enhanced keyboard--Makes typing easy by featuring auto-repeat to reduce the number of multiple keystrokes. High-capacity, 3 1/2" diskette drive--Enables you to read and write both standard-density (720 KB) and high-density (1.44 MB), 3 1/2" diskettes. Built-in 16-bit IDE (SmartDrive) hard drive interface--Enables you to quickly add hard disk storage. SmartDrives use an integrated controller to provide maximum performance and compatibility at a lower cost than other drive/controller combinations. The IDE interface supports up to two SmartDrives. Three Drive Bays--Enable you to install hard drives, diskette drives, tape cartridge systems, or CD-ROM drives. 3 1/2" 120 MB SmartDrive--Provides 120 MB of additional disk data storage (hard drive version only). Built-in Super VGA video port--Provides better performance than a video system installed through one of the computer expansion slots, yet maintains the high resolution and colors of Video Electronics Standard Association (VESA) specification Super Video Graphics Array (VGA). Super VGA features 16-color, non-interlaced 1024 x 768 and 800 x 600 graphics modes, and 132-column text modes. By upgrading the video memory from 512 KB to 1 MB (using an optional upgrade kit), you can display 256-color, non-interlaced 1024 x 768 video. The Super VGA video system is compatible with VGA (640 x 480), MCGA, EGA, CGA, MDA, and Hercules standards. Super VGA video requires a VGA analog monitor (color or monochrome). 4 MB system memory, expandable to 32 MB--Enables you to run a variety of software. Eight SIMM sockets are located on the main logic board for memory installation. Built-in mouse port (PS/2-style)--Leaves a 16-bit expansion slot open for an additional adapter board. Built-in serial and parallel ports--Lets you connect a serial mouse, an external modem, or other serial device. Also lets you connect a parallel printer or other parallel device, using the bidirectional parallel port. OPTIONS * multiple-frequency monitor * diskette drives, including 2.88 MB * hard drives * tape drive * CD-ROM drive * math coprocessor (must be installed by your computer dealer) * additional system memory, expandable to 32 MB * additional video memory, expandable to 1 MB * ISA expansion adapters