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Table of contents for the manual
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Page 1
EPSON Equity 4SX/25,4DX/33, and 4DX2/50 power hard disk (SPEED) light access light diskette drive power button bay for hard disk, diskette, tape, CD-ROM, or other drive 11 O/220 VAC switch . option card slots power keyboard inlet port I &al Serial port1 port2 VGA parallel monitor mouse Pofl poft Port Memory ROM Video RAM Shadow RAM Cache Math[...]
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Page 2
Keyboard Mouse Option slots Speaker Alternate VGA Mass Storage Horizontal mounts Vertical mount Diskette drives Hard disk drives Other devices Keyboard SETUP Program Stored in ROM; accessible by pressing the Delete key at the SETUP prompt during boot PS/2 compatible keyboard interface built into main system board; num lock setting selectable throug[...]
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Page 3
EPSON Equity 4SX/25,4DX/33, and 4DX2/50 Main System Board Diagram VGA video parallel serial 2 serial 1 mouse keyboard ELI-d CN2 CN3 QQQ 1 - power supply connectors VGA feature connector ml UlQ U18 standard - 512KB video memory < optional - 512KB CPU chip u21 OverDrive socket (ZIF socket) option board riser card connector CN 0000000000000000 0000[...]
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Page 4
EPSON Equity 4SX/25, 4DX/33, and 4DX2/50 Major Subassemblies main system option card connector board board (option board riser card) power supply ’ SIMM 0 i SIMM 1 diskette speaker drive Connector Pin Assignments Parallel Port Connector (CN6) pin 13 pin 1 i-1 pin 25 pin 14 Parallel Port Connector Pin Assignments horizontal drive bays Pin Signal[...]
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Page 5
EPSON Equity 4SX/25,4DX/33, and 4DX2/50 VGA Feature Connector (CN8) pin 1 ‘Yeeaeeeeoeaaw pin 25 pin 2 ’ ,feooooooooooo~, ’ pin 26 VGA Feature Connector Pin Assignments 8 IData I17 1 ENDATA’ I26 1 Not connected 9 1 PCLK 118 1 ENSYNC’ *Active low logic DMA Assignments Level Assigned device DMAO Spare @-bit) DMAl Spare (&bit) DMA2 FDD co[...]
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Page 6
EPSON Equity 4SX/25, 4DX/33, and 4DX2/50 Jumper Settings J7 J5 ,J13 J15 If the computer’s microprocessor is a FQFP type, it is surface- 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 position 2-3. Also make sure JlO, J11, an[...]
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Page 7
Video Memory If the computer has 512KB of video memory, you can install four 256K x 4 bit, 7Ons, 20-pin DRAM DIP (Dual InIine 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 EPSON Equity 4SX/25, 4DX/33, and 4DX2/50 Hard Disk Drive Types[...]
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Page 8
EPSON Equity 4SX/25, 4DX/33, and 4DX2/50 Installing Hard Disk Drives Ll It is recommended that a X-bit, AT-type hard disk controller be used if you are installing a drive that cannot use the embedded IDE interface. If you install a non-IDE hard disk drive and controller card, you need to use the SETUP program to disable the built-in IDE hard disk d[...]