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EPSON Endeavor 4SX/25, 4DX/33, and 4DX2/50
To select low speed, press the Ctrl, Alt,
hard disk diskette
power
pourer and - keys simultaneously. To select
access light drive bWon
(SPEED) light
high speed, press the Ctrl, Alt, and + keys
simultaneously. (Use the - or + key on the
numeric keypad.)
Memory 4MB RAM standard on a SIMM;
expandable using 1MB, 4MB, or 16MB
SIMMs to 32MB (maximum); SIMMs must
be 36-bit, fast-page mode type with 70ns
(or faster) access speed
ROM 128KB system BIOS, video BIO
Summary of the content on the page No. 2
EPSON Endeavor 4SX/25, 4DX/33, and 4DX2/50 Keyboard PS/2 compatible keyboard interface built SETUP Stored in ROM; accessible by pressing the into main system board; num lock setting Delete key at the SETUP prompt during boot Program selectable through SETUP; 6-pin, mini DIN connector Video Modes PS/2 compatible mouse interface built into Mouse Mode 1 Resolution 1 Colors 1 Memory required main system board; 6-pin, mini DIN VGA 640x480 16 512KB 512KB 640x480 256 connector 1MB 640x480 32, 768* Opti
Summary of the content on the page No. 3
EPSON Endeavor 4SX/25, 4DX/33, and 4DX2/50 Main System Board Diagram 4/1/93 EPSON Endeavor-3
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EPSON Endeavor 49SX/25, 40X/33, and 4DX2/50 Serial Port Connectors (CN4 and CN5) Major Subassemblies main system option card connector board board (option board riser card) Serial Port Connector Pin Assignments Keyboard Connector (CN3) and Mouse Connector (CN2) speaker drive drive bays Although the keyboard and mouse connectors are physically identical, they cannot be used interchangeably. Keyboard and Mouse Connector Pin Assignments Connector Pin Assignments Pin Signal Pin Signal 1 Data 4 +5 VD
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EPSON Endeavor 4SX/25, 4DX/33, and 4DX2/50 VGA Feature Connector (CN8) System I/O Address Map VGA Feature Connector Pin Assignments ‘Active low logic DMA Assignments Level Assigned device DMA0 Spare (&bit) DMA1 Spare (&bit) DMA2 FDD controller (&bit) DMA3 Spare (8-bit) DMA5 Spare (16-bit) DMA6 Spare (16-bit) DMA7 Spare (16-bit) Hardware Interrupts IRQ no. Function IRQ0 Timer output IRQ1 Keyboard IRQ3 Serial port 2 IRQ4 Serial port 1 IRQ5 Available (parallel port 2) IRQ6 FDD controller 4/1/93 EPS
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EPSON Endeavor 4SX/25, 4DX/33, and 4DX2/50 If the computer’s microprocessor is a FQFP type, it is surface- Jumper Settings mounted on the main system board. To add an OverDrive processor, install it in the empty OverDrive socket and disable the original microprocessor by setting jumper J23 to J5 J7 position 2-3. Also make sure J10, J11, and J12 are set correctly. Processor Speed Jumper Settings You need to change the processor speed jumper settings if processor with a 33 MHz processor. you repla
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EPSON Endeavor 4SX/25, 40X/33, and 4DX2/50 Hard Disk Drive Types (continued) Video Memory If the computer has 512KB of video memory, you can install four 256K x 4 bit, 70ns, 20-pin DRAM DIP (Dual Inline Package) chips to increase the video memory to 1MB. The following table lists which DRAM DIP chips you can install on the main system board. Supported DRAM Chips Manufacturer Part number Mitsubishi® M5M44256BP-7 Toshiba® TC514256AP-70 Micron® MT4C4256-70 Hard Disk Drive Types The table below list
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EPSON Endeavor 4SX/25, 4DX/33, and 4DX2/50 Installing Hard Disk Drives Information Reference List cl It is recommended that a 16-bit, AT-type hard disk controller be used if you are installing a drive that cannot Engineering Change Notices use the embedded IDE interface. If you install a non-IDE None. hard disk drive and controller card, you need to use the SETUP program to disable the built-in IDE hard disk drive Technical Information Bulletins interface. None. cl When installing a hard disk dr
