Epson Endeavor Product Information Guide - Page 6

EPSON Endeavor 4SX/25, 4DX/33, and 4DX2/50 Jumper Settings J7 J5 If the computer's microprocessor is a FQFP type, it is surfacemounted 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 J10, J11, and J12 are set correctly. Processor Speed Jumper Settings J13 J15 Adapter, CMOS, and PQFP jumper Settings Jumper number J5*** J6 J7*** J6 Jumper setting On Off* 1-2* 2-3 On Off' 1-2* Function Supports CGA adapters Supports monochrome, EGA, MCGA, and VGA adapters Enables the built-in VGA display adapter Disables the built-in VGA display adapter so you can use a display adapter on an option card in the computer as the primary adapter Returns CMOS RAM to the factory settings Retains SETUP program settings Reserved J18 J23** 1-2* Gate A20 reset (standard setting for windows) 2-3 Keyboard reset 1-2 Enables the WFP SX/25 processor 2-3 Disables the PQFP SX/25 processor * Factory setting ** Factory setting depends on type of processor on system board l ** Two pin jumpers Processor Jumper Settings ~1 You need to change the processor jumper settings if you install a new processor chip. The settings for J10, J11, and J12 must correspond to the type of chip installed. You need to change the processor speed jumper settings if you replace a 25 MHz processor with a 33 MHz processor. Processor Chips If you have the 4SX/25 or 4DX/33 system, you can install an Intel OverDrive processor on the main system board to effectively double the internal clock speed of the computer's microprocessor. Alternatively, for the 4SX/25, you can install the 487SX/25 microprocessor with built-in math coprocessor. OverDrive Processors System 4SX/25 40X/33 OverDrive processor ODP486-25 ODP486-33 SIMM Installation The computer comes with 4MB of memory installed in a SIMM socket. To increase the amount of memory in the computer up to 32MB, you can install 36-bit, fast-page mode SIMMs that operate at an access speed of 70ns or faster, with a capacity of 1MB, 4MB, or 16MB. The following table shows the possible SIMM configurations; do not install memory in any other configuration. Make sure that both SIMMs operate at the same speed. SIMM Configurations SIMM 0 4MB 4MB 1MB 4MB 16MB 16MB 1MB 16MB 4MB 16MB l Standard memory SIMM 1 4MB 1MB 4MB 4MB 16MB 1MB 16MB 4MB 16MB 16MB Total memory 4MB * 4MB 5MB 5MB 8MB 16MB 16MB 17MB 17MB 20MB 20MB 32MB EPSON Endeavor-6 4/1/93