486 MOTHERBOARD OPTI-495XLC 3/486WB, EXP3406. - 486SX/DX/overd(25,33,40,50MHz) or 386DX(33,40MHz) optional 387 (PGA/PQFP). - 2 VESA LocalBus slots, 7 ISA slots 16-bit. - 2 banks with 4 (=8) SIMM slots 30pin. 256k, 1M, 4M, 16M modules - Cache SRAM 64kB/128kB/256kB. - AMI ROM BIOS. - Dimension 9.8" x 8.6". 2/3 baby AT size. .-----------------------------------------------. | JP26: :J6 :JP21 |J7| | | # # # # # # # | | # # # # # # # .---------------.| | # # # # # # # | | | | | | | | || | # # # # # # # |1|2|3|4|5|6|7|8|| <--- yes, bank0 | # # # # # # # | | | | | | | | || is 5..8. | # # # # # # # | BANK1 | BANK0 || | | | | | | | | | || | # # # # # # # | | | | | | | | || | # # # # JP# # # | | | | | | | | || | # # # # 30# # # `---------------'| | #.. # # # ..# # # #8k# # # # #| | JP20 .------. /-----.JP #x8# #BA#NK# 1#| |V# J# |386PGA| |82C49|17.# # # # # #| |L#P13# :JP19|486DLC| |95XLC| ..JP16 32k x 8 | |b#:: # :JP18\------' `-----'..JP15 # # # #| |u#P12# JP14:.-------. /-----. #BA#NK# 0#| JP28 |s# # JP4:| 486 | |3/486| # # # #| JP8 | JP24 JP2. | 387 | |PQF | ::: <---------JP7 | .. JP1: : `-------/ `-----' ::: | JP22 | ... ... .. .. .. JP25::: JP10::: :::JP9 | JP6 `-J1--J2--J3-J4-J5-----JP27----JP11-------JP23--' - Memory. Bank 0 must be fully occupied, otherwise the board will not work. Only memory with parity bit will work. Possible conbinations: Total: 1M 2M 4M 5M 8M 16M 17M 20M 20M 32M 64M Bank0: 256k 256k 1M 1M 1M 4M 256k 1M 4M 4M 16M Bank1: - 256k - 256k 1M - 4M 4M 1M 4M - - VL bus. VL1(slave) is the outer connector, use for video. VL2(master/slave) is the inner connector, use for controller. JP24: 1-2 = WD31, 50MHz VESA VGA or CACHE IDE or other special VESA card. 2-3 = (default) Standard VESA VGA in VL1. - Cache size. Size JP10 JP11 JP16 JP17 Bank0(U12-15) Bank1(U20-23) U18 U19 64kB 2-3 2-3 open open 8Kx8 8Kx8 8Kx8 none 128kB 1-2 1-2 close open 32Kx8 none 8Kx8 none 256kB 2-3 2-3 close close 32Kx8 32kX8 8Kx8 8Kx8 or 32Kx8 none - CPU (smd=factory soldered, pga=removeable) JP2: open=486SX(pga), 1-2=486DX/DX2, 2-3=487SX/overdrive JP6: open=486SX/DX, close=386,486DLC JP7: close=486DX50,386,486DLC,486DX40, open=486 JP8: close=486SX33/DX33/DX266/od33,386DX40,486DLC40,486DX40 open=486SX25/DX25/DX250/od25/DX50,386DX33,486DLC33 JP9: 1-2=486SX/DX, 2-3=386,486DLC JP14: open=386,486DLC, close=486SX/DX JP15: open=surface mounted(smd) 386DX/486SX, closed=pin grid array(pga) 486/486DLC, and will disable smd JP18: open=486SX(pga), closed=486DX/DX2,487SX,overdrive JP19: 2-3=486SX(pga), 1-2=486DX/DX2,487SX,overdrive JP20: 1-2=486SX/DX, 2-3=386,486DLC JP22: open=486SX33/DX33/DX266/od33/DX50,386,486DLC,486DX40 close=486SX25/DX25/DX250/od25 JP25: 1-2=386,486DLC, 2-3=486SX/DX JP27: 1-2=386,486DLC, 2-3=486SX/DX JP28: open=old version 486DX50, closed=new version 486DX50 - other functions: JP1: VESA IDE4 JP12: VESA IDE3 JP13: VESA IDE2 JP23: factory jumper, do not change JP4: 87DLC PQFP: open=enable, close=disable JP21: monitor type: open=mono, closed=color JP26: battery type: 1-2 Lithium non-rechargeable, 2-3 NiCD rechargeable - Notes for AMI BIOS SETUP: -- 486DX50 use "AT BUS Clock Selection" CLKI/6, AMD486DX40 use CLKI/5. -- "AUTO Config Function" must be DISABLED for 386DX33,386DX40, 486DLC33,486DLC40. (DLC=Cyrix) /Tomas Andersson 1996