MECER CORPORATION B860/B860 (REV. A) Processor CX486SX/80486SX/80486DX/80486DX2/Pentium Overdrive Processor Speed 25/33/40/50(internal)/50/66(internal)MHz Chip Set Unidentified Max. Onboard DRAM32/128MB (depends on board revision) Cache 128/256KB BIOS AMI Dimensions 330mm x 218mm I/O Options 32-bit VESA local bus slots (2) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Power LED & JP6 pins 1 - Reset switch JP6 pins 19 - keylock 5 20 Speaker JP6 pins 6 - External battery JP17 9 Turbo LED JP6 pins 11 - Auxiliary keyboard JP35 12 connector Turbo switch JP6 pins 16 - 32-bit VESA local SL1 & SL2 17 bus slots USER CONFIGURABLE SETTINGS Function Jumper Position » PQFP CPU disabled JP1 Closed PQFP CPU enabled JP1 Open » CMOS memory normal operation JP16 pins 1 & 2 closed CMOS memory clear JP16 pins 2 & 3 closed » Battery type select 4.5v JP34 Closed Battery type select 6.0v JP34 Open » CPU speed select 20/25MHz JP72 Closed CPU speed select => 33MHz JP72 Open » VESA card select normal JP89 Closed VESA card select Weitek VESA JP89 Open card only DRAM CONFIGURATION (REV. 0) Size Bank 0 Bank 1 2MB (4) 256K x 9 (4) 256K x 9 5MB (4) 256K x 9 (4) 1M x 9 8MB (4) 1M x 9 (4) 1M x 9 17MB (4) 256K x 9 (4) 4M x 9 20MB (4) 1M x 9 (4) 4M x 9 32MB (4) 4M x 9 (4) 4M x 9 DRAM CONFIGURATION (REV. A) Size Bank 0 Bank 1 2MB (4) 256K x 9 (4) 256K x 9 5MB (4) 256K x 9 (4) 1M x 9 8MB (4) 1M x 9 (4) 1M x 9 17MB (4) 256K x 9 (4) 4M x 9 20MB (4) 1M x 9 (4) 4M x 9 32MB (4) 4M x 9 (4) 4M x 9 65MB (4) 256K x 9 (4) 16M x 9 68MB (4) 1M x 9 (4) 16M x 9 80MB (4) 4M x 9 (4) 16M x 9 128MB (4) 16M x 9 (4) 16M x 9 DRAM JUMPER CONFIGURATION Revision JP76 JP77 JP90 JP91 JP92 JP93 Rev. 0 1 & 2 2 & 3 Open Open Open 2 & 3 Rev. A 2 & 3 1 & 2 Closed Closed Closed 1 & 2, 3 & 4 Note: Pins designated should be in the closed position. CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 128KB (4) 32K x 8 NONE (1) 8K x 8 256KB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP7 JP8 128KB pins 1 & 2 closed pins 2 & 3 closed 256KB pins 1 & 2 closed pins 1 & 2 closed CPU TYPE CONFIGURATION Type JP2 JP3 JP4 JP5 JP9 CX486SX 2 & 3 Open Open 2 & 4 2 & 3 80486SX (PQFP) Open Open Open 3 & 5 2 & 3 80486SX (PGA) 2 & 3 Open Open 2 & 3 2 & 3 80486DX 1 & 2, 3 2 & 3 Open 2 & 3 2 & 3 & 4 80486DX2 1 & 2, 3 2 & 3 Open 2 & 3 2 & 3 & 4 Pentium 1 & 2, 3 1 & 2 Closed 2 & 3 2 & 3 Overdrive & 4 Note: Pins designated should be in the closed position. CPU SPEED CONFIGURATION Speed JP33 JP36 25MHz pins 2 & 3 closed pins 2 & 6, 4 & 8 closed 33MHz pins 2 & 3 closed pins 3 & 7, 4 & 8 closed 40MHz pins 2 & 3 closed pins 2 & 6 closed 50iMHz pins 2 & 3 closed pins 2 & 6, 4 & 8 closed 50MHz pins 1 & 2 closed pins 3 & 7 closed 66iMHz pins 2 & 3 closed pins 3 & 7, 4 & 8 closed VESA WAIT STATE CONFIGURATION Wait states ID2 0 wait states Open 1 wait state Closed BUS SPEED CONFIGURATION CPU speed ID3 <= 33MHz Open > 33MHz Closed PAL JUMPER CONFIGURATION Revision JP96 TP1 TP2 TP3 TP4 Rev. 0 Open 2 & 3 2 & 3 2 & 3 2 & 3 Rev. A Closed 1 & 2 1 & 2 1 & 2 1 & 2 Note: Pins designated should be in the closed position. BOARD REVISION JUMPER CONFIGURATION Revision JP78 JP79 JP97 JP98 Rev. 0 pins 1 & 2 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed closed Rev. A pins 2 & 3 pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed closed Note: These jumpers configure the board revision.