YOUNG MICRO SYSTEMS, INC. VEGA 486 PCI/VESA Processor 80486SX/80486DX/80486DX2/Pentium Overdrive Processor Speed 20/25/33/50(internal)/66(internal)MHz Chip Set Intel Max. Onboard DRAM128MB Cache 64/128/256/512KB BIOS AMI Dimensions 330mm x 218mm I/O Options 32-bit VESA local bus slots (3), PCI bus slots (4) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location PS/2 mouse port J1 Reset switch J5 Power LED & keylock J2 32-bit VESA Local SL1, SL2, SL3 bus slots Speaker J3 32-bit PCI slots P1, P2, P3, P4 Turbo switch J4 USER CONFIGURABLE SETTINGS Function Jumper Position » Factory configured - do not J6 Open alter » Factory configured - do not JP15 Open alter » Parity check enabled JP16 Open Parity check disabled JP16 Closed » Monitor type select color JP21 pins 1 & 2 closed Monitor type select monochrome JP21 pins 2 & 3 closed » Factory configured - do not JP41 Open alter » Factory configured - do not JP43 Open alter » Factory configured - do not JP44 Open alter » Factory configured - do not JP81 Open alter CMOS CONFIGURATION Type JP22 JP23 JP26 CMOS memory Closed Open Open normal CMOS memory Open Closed Closed clear DRAM CONFIGURATION Size Bank 0 Bank 1 2MB (2) 256K x 36 NONE 4MB (2) 256K x 36 (2) 256K x 36 8MB (2) 1M x 36 NONE 10MB (2) 1M x 36 (2) 256K x 36 16MB (2) 1M x 36 (2) 1M x 36 32MB (2) 4M x 36 NONE 34MB (2) 4M x 36 (2) 256K x 36 40MB (2) 4M x 36 (2) 1M x 36 64MB (2) 4M x 36 (2) 4M x 36 64MB (2) 8M x 36 NONE 66MB (2) 8M x 36 (2) 256K x 36 72MB (2) 8M x 36 (2) 1M x 36 96MB (2) 8M x 36 (2) 4M x 36 128MB (2) 8M x 36 (2) 8M x 36 CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 64KB (4) 8K x 8 (4) 8K x 8 (2) 16K x 4 128KB (4) 32K x 8 NONE (2) 16K x 4 256KB (4) 32K x 8 (4) 32K x 8 (2) 16K x 4 512KB (4) 128K x 8 NONE (2) 32K x 4 CACHE JUMPER CONFIGURATION Size JP6 JP7 JP8 JP9 64KB Open Open Open Open 128KB Closed Open Open Closed 256KB Closed Closed Open Closed 512KB Closed Closed Closed Closed CACHE JUMPER CONFIGURATION (CON'T) Size JP10 JP11 JP17 JP18 64KB Open Open pins 2 & 3 pins 2 & 3 closed closed 128KB Open Open pins 2 & 3 pins 1 & 2 closed closed 256KB Closed Open pins 1 & 2 pins 2 & 3 closed closed 512KB Closed Closed pins 1 & 2 pins 1 & 2 closed closed L2 CACHE CONFIGURATION Size JI1 JI2 JI3 Standard pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed Interleaved pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed CACHE CONTROL CONFIGURATION Wait states Tag bit size JP14 JP20 O wait states 7 bit pins 1 & 2 pins 1 & 2 closed closed 1 wait state 8 bit pins 2 & 3 pins 2 & 3 closed closed CACHE MODE CONFIGURATION (L2) Type JP4 JP19 L2 cache (write-through) Open pins 1 & 2 closed L2 cache (write-back) Closed pins 1 & 2 closed L2 cache (disabled) N/A pins 2 & 3 closed CACHE MODE CONFIGURATION (PENTIUM OVERDRIVE) Type JP2 JP60 Overdrive (write-through) Open pins 1 & 2 closed Overdrive (write-back) Closed pins 2 & 3 closed CPU TYPE CONFIGURATION Type JP1 JP3 JP12 JP13 JP27 JP28 80486SX-20 2 & 3 1 & 2 2 & 3 2 & 3 Closed Closed 80486SX-25 2 & 3 1 & 2 2 & 3 2 & 3 Open Closed 80486SX-33 2 & 3 1 & 2 1 & 2 2 & 3 Closed Open 80486DX-20 1 & 1 & 2 2 & 3 2 & 3 Closed Closed 2, 3 & 4 80486DX-25 1 & 1 & 2 2 & 3 2 & 3 Open Closed 2, 3 & 4 80486DX-33 1 & 1 & 2 1 & 2 2 & 3 Closed Open 2, 3 & 4 80486DX2-50 1 & 1 & 2 2 & 3 2 & 3 Open Closed 2, 3 & 4 80486DX2-66 1 & 1 & 2 1 & 2 2 & 3 Closed Open 2, 3 & 4 Overdrive 1 & 2 & 3 1 & 2 2 & 3 Closed Open 2, 3 & 4 Note: Pins designated should be in the closed position. CPU VOLTAGE CONFIGURATION Voltage JP5/A JP5/B JP5/C JP5/D 5.0V CPU Open Open Closed Closed 80486DX4 CPU Open Open Open Open VESA WAIT STATE/BUS SPEED CONFIGURATION CPU speed Wait states JP36 JP37 < 33MHz 0 wait states Open Open > 33MHz 1 wait state Closed Closed PCI ADDRESS CONFIGURATION Address (Slot Address (Slot JP70 JP71 1) 2) Address 17 Address 17 pins 1 & 2 pins 1 & 2 closed closed Address 28 Address 29 pins 2 & 3 pins 2 & 3 closed closed PCI IRQ CONFIGURATION IRQ Type JP33 (IRQ9) JP34 (IRQ10) JP35 (IRQ11) JP38 (IRQ14) Standard pins 1 & 2 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed closed Inverted pins 2 & 3 pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed closed PCI LEVEL TRIGGER IRQ CONFIGURATION IRQ Type JP39 IRQ9 pins 1 & 2 closed IRQ10 pins 3 & 4 closed IRQ11 pins 5 & 6 closed IRQ14 pins 7 & 8 closed IRQ15 pins 9 & 10 closed SYSTEM BIOS CONFIGURATION Type JP24 JP25 Normal Open pins 1 & 2 closed Flash Closed pins 1 & 2 closed Recover Open pins 2 & 3 closed