==View or Print jumper settings using Fixedsys or New Courier fonts==
MB-495SX Rev1.1 Motherboard
- also known as OPTI-495SX 3/486WB CACHE
- BIOS ID string ????????????????? (please send in yours)
- AMI BIOS ID string 40-0101-001107-00001111-060692-OPWB4SXWB-F
- 8-30 pin SIMM slots (1-32meg FPM DRAM)
- 1-32 bit VESA Local Bus slots (Non-functional)
- 6-16 bit ISA slots
- 2-8 bit ISA slots
- 64k-256k CACHE support in 8-28pin sockets + 1 TAG RAM socket
- AMI 1992 Bios
- Opti 82c495sx/82c206q/82c392sx chipset
- AMD 386-40 soldered onboard
- 239pin 486 PGA Socket + 80387 NPU socket which supports these processors:
INTEL 80386DX,80487SX,80486SX/DX/DX2, ODP486SX
- Supports speeds of 25/33/40/50/66 MHz.
- manufactured by: INFOMATIC POWER SYSTEMS CORPORATION
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CONNECTIONS
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Purpose Location Purpose Location
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Power LED + keylock J1 Reset switch J5
Speaker J2 External battery JP18
Turbo switch J3 32-bit VESA card S1
Turbo LED J4
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USER CONFIGURABLE SETTINGS
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Function Jumper Position
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. Factory configured - do not alter JP8 unknown
. Factory configured - do not alter JP9 unknown
. Factory configured - do not alter JP10 unknown
. Factory configured - do not alter JP11 unknown
. Monitor type select color JP17 closed
Monitor type select monochrome JP17 open
. CMOS memory normal operation JP18 pins 2 + 3 closed
CMOS memory clear JP18 pins 3 + 4 closed
External battery select JP18 connected
. Factory configured - do not alter JP23 open
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CACHE JUMPER CONFIGURATION
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Size JP6 JP7 JP12 JP13
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64KB open open open pins 2 + 3 closed
128KB open closed closed pins 1 + 2 closed
256KB closed closed closed pins 2 + 3 closed
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CACHE CONFIGURATION
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Size Cache Location TAG
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64KB (8) 8K x 8 Banks 0 + 1 (1) 8K x 8
128KB (4) 32K x 8 Bank 0 (1) 8K x 8
256KB (8) 32K x 8 Banks 0 + 1 (1) 32K x 8
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DRAM CONFIGURATION
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Size Bank 0 Bank 1
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1MB (4) 256K x 9 NONE
2MB (4) 256K x 9 (4) 256K x 9
4MB (4) 1M x 9 NONE
5MB (4) 256K x 9 (4) 1 x 9
8MB (4) 1M x 9 (4) 1M x 9
16MB (4) 4M x 9 NONE
20MB (4) 1M x 9 (4) 4M x 9
32MB (4) 4M x 9 (4) 4M x 9
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CPU MODE CONFIGURATION
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Mode JP3 JP5 JP20 JP21 JP24
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486 (PQFP) pins 1 + 2 pins 2 + 3 open N/A pins 2 + 3
486 (PGA) pins 1 + 2 pins 2 + 3 closed closed pins 2 + 3
386 (PQFP) pins 2 + 3 pins 1 + 2 N/A open pins 1 + 2
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CPU TYPE CONFIGURATION (PQFP)
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Type JP14 JP22 JP51 JP52
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80486SX-33MHz 1 + 2 closed N/A open closed
80486SX-25MHz 1 + 2 closed N/A closed open
80386DX-40MHz 2 + 3 closed open open open
80386DX-33MHz 2 + 3 closed closed open closed
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CPU TYPE CONFIGURATION (PGA)
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Type JP1 JP2 JP4 JP14 JP51 JP52
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80486DX2-66MHz closed 1 + 2 1 + 2 1 + 2 open closed
80486DX2-50MHz closed 1 + 2 1 + 2 1 + 2 closed open
ODP486SX-33MHz closed 1 + 2 2 + 3 1 + 2 open closed
ODP486SX-25MHz closed 1 + 2 2 + 3 1 + 2 closed open
80486DX-50MHz closed 1 + 2 1 + 2 2 + 3 closed open
80486DX-33MHz closed 1 + 2 1 + 2 1 + 2 open closed
80486DX-25MHz closed 1 + 2 1 + 2 1 + 2 closed open
80487SX-33MHz closed 1 + 2 2 + 3 1 + 2 open closed
80487SX-25MHz closed 1 + 2 2 + 3 1 + 2 closed open
80486SX-33MHz open 2 + 3 open 1 + 2 open closed
80486SX-25MHz open 2 + 3 open 1 + 2 closed open
===========================END OF DATA ON 495SX rev:1.1============================
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