321 Studios 486C manual

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Table of contents for the manual

  • Page 1

    EPSON Endeavor 486C power button Memory ROM bay for hard disk, diskette drive, CD-ROM, tape drive, or other Video RAM option card slots Computer Specifications Shadow RAM Cache Math coprocessor Clock/calendar Controllers Video CPU and Memory 32-bit CPU 4SX/25C: Intel i486SX, 25 MHz microprocessor in PGA-type CPU socket; can be upgraded with optiona[...]

  • Page 2

    EPSON Endeavor 486C Parallel Serial Keyboard Mouse Option slots Speaker VGA feature connector Mass Storage One standard S-bit parallel, uni- or bi- directional interface built into main system board; I/O address selectable through SETUP; 25-pin, D-shell connector Two RS-232C, programmable, asynchronous interfaces built into main system board; 9-pin[...]

  • Page 3

    EPSON Endeavor 486C Main System Board Diagram 7/15/93 EPSON Endeavor 486C-3[...]

  • Page 4

    EPSON Endeavor 486C Major Subassemblies Serial Port Connectors (CN9 and CN10) Connector Pin Assignments Parallel Port Connector (CN8) Serial Port Connector Pin Assignments Keyboard Connector (CN5) and Mouse Connector (CN4) Although the keyboard and mouse connectors are physically identical, they cannot be used interchangeably. Keyboard and Mouse Co[...]

  • Page 5

    EPSON Endeavor 486C VGA Feature Connector (CN14) System l/O Address Map VGA Feature Connector Pin Assignments *Active low logic DMA Assignments Level Assigned device DMA0 Spare (8-bit) DMA1 Spare (8-bit) DMA2 Diskette drive controller (8-bit) DMA3 Spare (8-bit) DMA4 DMA5 DMA6 Cascade for DMA controller Spare (16-bit) spare (16-bit) 1 DMA7 1 spare ([...]

  • Page 6

    EPSON Endeavor 486C System Memory Map Hard Disk Drive Jumper Settings l lf CS (cable selection) is jumpered, the drive is a master if pin-28 is grounded and a slave if pin-28 Is not grounded. DIP Switch Settings Switch Setting 1** ON OFF 2** ON Off 3** ON Off 4 ON’ Off 5 ON’ Off 33 MHz CPU speed 25 MHz CPU speed 25 MHz CPU speed 33 MHz CPU spee[...]

  • Page 7

    EPSON Endeavor 486C Video Memory Hard Disk Drive Types If the computer has 512KB of video memory, you can install four 256K x 4 bit, 70ns, 20-pin DRAM ZIP (Zig-zag Inline Package) chips to increase the video memory to 1MB. The following table lists compatible DRAM ZIP chips. Supported Video ZIP Chips The table below lists types of hard disk drives [...]

  • Page 8

    EPSON Endeavor 486C Installation/Support Tips Mouse and Keyboard 0 When connecting the mouse and keyboard to the computer, be careful to plug them into the proper ports. Although the ports are physically identical, they are not interchangeable, and damage may occur to the main system board if you plug the connectors into the wrong ports. Installing[...]