UNIDENTIFIED VL/ISA-PB486P3 Processor 80486SX/CX486DX/80486DX/80486DX2/80486DX4/P24D/Pentium Overdrive Processor 25/33/40/50(internal)/50/66(internal)MHz Speed Chip Set Unidentified Max. Onboard 64MB DRAM Cache 64/128/256KB BIOS AMI Dimensions 254mm x 220mm I/O Options 32-bit VESA local bus slots (3), green PC connector NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Turbo switch CN1 (pins 1 - Green PC connector JP32 2) Turbo LED CN1 (pins 3 - Reset switch S1 4) Power LED & J2 32-bit VESA local SL1 - SL3 keylock bus slots Speaker JP18 USER CONFIGURABLE SETTINGS Function Jumper Position » CPU voltage select 5v JP1 Closed CPU voltage select 3.3v JP1 Open » CMOS memory normal operation JP26 pins 2 & 3 closed CMOS memory clear JP26 pins 1 & 2 closed DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 1MB (4) 256K x 9 NONE NONE 2MB NONE (1) 512K x 36 NONE 4MB (4) 1M x 9 NONE NONE 4MB NONE (1) 1M x 36 NONE 4MB NONE (1) 512K x 36 (1) 512K x 36 6MB NONE (1) 512K x 36 (1) 1M x 36 8MB (4) 1M x 9 NONE (1) 1M x 36 8MB NONE (1) 2M x 36 NONE 8MB NONE (1) 1M x 36 (1) 1M x 36 10MB NONE (1) 512K x 36 (1) 2M x 36 12MB (4) 1M x 9 NONE (1) 2M x 36 12MB NONE (1) 1M x 36 (1) 2M x 36 16MB (4) 4M x 9 NONE NONE 16MB NONE (1) 2M x 36 (1) 2M x 36 16MB NONE (1) 4M x 36 NONE 20MB (4) 1M x 9 NONE (1) 4M x 36 20MB NONE (1) 1M x 36 (1) 4M x 36 32MB (4) 4M x 9 NONE (1) 4M x 36 32MB NONE (1) 4M x 36 (1) 4M x 36 32MB NONE (1) 8M x 36 NONE 64MB NONE (1) 8M x 36 (1) 8M x 36 CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 64KB (4) 8K x 8 (4) 8K x 8 (1) 8K x 8 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 JP10 JP11 JP13 64KB Open Open pins 2 & 3 closed 128KB Open Closed pins 1 & 2 closed 256KB Closed Closed pins 2 & 3 closed CPU TYPE CONFIGURATION Type JP3 JP4 JP5 JP6 JP7 80486SX Open Open Open 1 & 2 Open SL80486SX Open Open Open 1 & 2 Open CX486DX (1x) 1 & 2 Open 2 & 3 2 & 3 Open CX486DX (2x) 1 & 2 Open 2 & 3 2 & 3 Open 80486DX 1 & 2 Open 2 & 3 1 & 2 Open SL80486DX 1 & 2 Open 2 & 3 1 & 2 Open 80486DX2 1 & 2 Open 2 & 3 1 & 2 Open SL80486DX2 1 & 2 Open 2 & 3 1 & 2 Open 80486DX4 (2x) 1 & 2 Open 2 & 3 1 & 2 Open 80486DX4 (2.5x) 1 & 2 Open 2 & 3 1 & 2 Open 80486DX4 (3x) 1 & 2 Open 2 & 3 1 & 2 Open P24D (WB) 1 & 2 Open 2 & 3 1 & 2 1 & 2 P24D (WT) 1 & 2 Open 2 & 3 1 & 2 2 & 3 Pentium 1 & 2 Closed 2 & 3 1 & 2 Open Overdrive Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type JP8 JP9 JP12 JP22 JP23 80486SX 2 & 3 Open Open 1 & 2 Open SL80486SX 2 & 3 Open Open 1 & 2 Open CX486DX (1x) 1 & 2 1 & 2 Open 1 & 2 Open CX486DX (2x) 1 & 2 1 & 2 Open 1 & 2 Open 80486DX 1 & 2 Open Open 1 & 2 Open SL80486DX 1 & 2 Open Open 1 & 2 Open 80486DX2 1 & 2 Open Open 1 & 2 Open SL80486DX2 1 & 2 Open Open 1 & 2 Open 80486DX4 (2x) 1 & 2 Open Open 1 & 2 Open 80486DX4 1 & 2 Open Open 1 & 2 Open (2.5x) 80486DX4 (3x) 1 & 2 Open Open 1 & 2 Open P24D (WB) 1 & 2 2 & 3 Closed 1 & 2 Closed P24D (WT) 1 & 2 2 & 3 Closed 1 & 2 Closed Pentium 1 & 2 2 & 3 Open 1 & 2 Open Overdrive Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type JP24 JP25 JP27 JP36 JP40 JP43 80486SX Open Open Open 1 & 2 Closed Open SL80486SX Closed Closed Open 2 & 3 Closed Open CX486DX (1x) Open Open 1 & 2 1 & 2 Closed Open CX486DX (2x) Open Open 2 & 3 1 & 2 Closed Open 80486DX Open Open Open 1 & 2 Closed Open SL80486DX Closed Closed Open 2 & 3 Closed Open 80486DX2 Open Open Open 1 & 2 Closed Open SL80486DX2 Closed Closed Open 2 & 3 Closed Open 80486DX4 Closed Closed Open 2 & 3 Closed 1 & 2 (2x) 80486DX4 Closed Closed Open 2 & 3 Closed 2 & 3 (2.5x) 80486DX4 Closed Closed Open 2 & 3 Closed Open (3x) P24D (WB) Closed Closed Open 2 & 3 Closed Open P24D (WT) Closed Closed Open 2 & 3 Closed Open Pentium Open Open Open 1 & 2 Closed Open Overdrive Note: Pins designated should be in the closed position. CPU SPEED CONFIGURATION Speed JP38 JP39 25MHz Open Closed 33MHz Closed Open 40MHz Open Open 50iMHz Open Closed 50MHz Closed Closed 66iMHz Closed Open VESA WAIT STATE CONFIGURATION Wait states JP33 0 wait states Open 1 wait state Closed BUS SPEED CONFIGURATION CPU speed JP34 <= 33MHz Open > 33MHz Closed