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EPSON Endeavor 486C
To select slow speed, press the Ctrl, Alt,
power
and - keys simultaneously. To select
button
fast speed, press the Ctrl, Alt, and + keys
simultaneously. (Use the - or + key on the
numeric keypad.) Default system speed is
also user-selectable through SETUP
4MB RAM standard; expandable using
Memory
1MB, 4MB, or 16MB SIMMs to 36MB
(maximum); SIMMs must be 36-bit,
fast-page mode type with 70ns (or faster)
access speed
ROM 128KB system BIOS, video BIOS, and
SETUP code located in E
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EPSON Endeavor 486C Parallel One standard S-bit parallel, uni- or bi- Video Modes directional interface built into main system Mode Resolution board; I/O address selectable through VGA 640x480 SETUP; 25-pin, D-shell connector Extended, 640x480 512KB memory required 640 x 480 Serial Two RS-232C, programmable, 640x480 asynchronous interfaces built into main 800x600 system board; 9-pin, D-shell connectors 800x600 Extended, 640x480 Keyboard PS/2 compatible keyboard interface built 1 MB memory requir
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EPSON Endeavor 486C Main System Board Diagram EPSON Endeavor 486C-3 7/15/93
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EPSON Endeavor 486C Serial Port Connectors (CN9 and CN10) Major Subassemblies 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. Connector Pin Assignments Keyboard and Mouse Connector Pin Assignments Parallel Port Connector (CN8) Pin Signal Pin Signal Data 4 +5VDC (fused) 1 5 clock 2 Resewed Reserved 3 Ground 6 VGA Port Connector (CN13) Parallel Port Con
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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 Cascade for DMA controller DMA5 Spare (16-bit) DMA6 spare (16-bit) 1 DMA7 1 spare (16-bit) Hardware Interrupts IRQ no. Function IRQ0 Timer output IRQ1 Keyboard IRQ3 Serial port 2 IRQ4 Serial port 1 1 IRQ5 1 Available parallel port 2)
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EPSON Endeavor 486C Hard Disk Drive Jumper Settings System Memory Map 23FFFFF 36MB 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 Extended memory 33 MHz CPU speed 1** ON OFF 25 MHz CPU speed 2** ON 25 MHz CPU speed Off 33 MHz CPU speed 3** ON CPU present in PGA socket Off CPU absent from PGA socket 4 ON’ Enable password security feature Off Disable password security featur
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EPSON Endeavor 486C Video Memory Hard Disk Drive Types If the computer has 512KB of video memory, you can install The table below lists types of hard disk drives supported by four 256K x 4 bit, 70ns, 20-pin DRAM ZIP (Zig-zag Inline the computer. Check this table and the hard disk manual to Package) chips to increase the video memory to 1MB. The find the correct type number(s) for the hard disk drive(s) following table lists compatible DRAM ZIP chips. installed in the computer. Enter the type num
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EPSON Endeavor 486C Password Installation/Support Tips 0 Make sure that you do not forget the password you set up. If you do: Mouse and Keyboard 1. Disable it by setting DIP switch 4 on the main system 0 When connecting the mouse and keyboard to the board to OFF. computer, be careful to plug them into the proper ports. Although the ports are physically identical, they are not 2. Then turn the computer on and off again. interchangeable, and damage may occur to the main system board if you plug th
