ATC/UNITRON COMPUTER & COMPUTER PARTS U 6923 Processor (SL)AM486SX/80486SX/SL80486SX/UMC486/CXM7/AM486DX/(SL)AM486DX/80486DX/SL80486DX/AM486DX2/(SL)AM486DX2/80486DX2/SL80486DX2/ AM486DX4/(SL)AM486DX4/80486DX4/SL80486DX4/CXM9/P24D/ Pentium Overdrive Processor 25/33/40/50(internal)/50/66(internal)/80(internal)/100(internal)/ 120(internal)MHz Speed Chip Set SIS Max. 128MB Onboard DRAM Cache 128/256/512KB BIOS Award Dimensions 220mm x 220mm I/O 32-bit PCI slots (3), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, serial ports (2) Options NPU None Options [Image] CONNECTIONS Purpose Location Purpose Location Parallel port CN1 Green PC connector JP35 IDE interface 2 CN2 Green PC connector JP36 IDE interface 1 CN3 Turbo LED JP37 Floppy drive interface CN4 Reset switch JP38 Serial port 1 CN5 Turbo switch JP39 Serial port 2 CN6 Power LED & keylock JP40 External battery JP1 Green PC LED LED1 Speaker JP27 32-bit PCI slots PC1 - PC3 IDE interface LED JP33 USER CONFIGURABLE SETTINGS Function Jumper Position » Monitor type select color JP6 Closed Monitor type select monochrome JP6 Open » Factory configured - do not JP13 N/A alter » DREQ select DREQ1 JP18 pins 1 & 3 closed DREQ select DREQ3 JP18 pins 2 & 4 closed » BIOS type select EPROM JP19 Open BIOS type select 5v flash JP19 pins 2 & 3 closed BIOS type select 12v flash JP19 pins 1 & 2 closed » DACK select DACK1 JP22 pins 1 & 3 closed DACK select DACK3 JP22 pins 2 & 4 closed Turbo enabled JP39 pins 2 & 3 closed Turbo disabled JP39 pins 1 & 2 closed DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 1MB (1) 256K x NONE NONE NONE 36 2MB (1) 512K x NONE NONE NONE 36 2MB (1) 256K x (1) 256K x NONE NONE 36 36 3MB (1) 512K x (1) 256K x NONE NONE 36 36 3MB (1) 256K x (1) 256K x (1) 256K x NONE 36 36 36 3MB (1) 256K x (1) 512K x NONE NONE 36 36 4MB (1) 1M x 36 NONE NONE NONE 4MB (1) 512K x (1) 256K x (1) 256K x NONE 36 36 36 4MB (1) 512K x (1) 512K x NONE NONE 36 36 4MB (1) 256K x (1) 256K x (1) 256K x (1) 256K x 36 36 36 36 5MB (1) 1M x 36 (1) 256K x NONE NONE 36 5MB (1) 512K x (1) 256K x (1) 256K x (1) 256K x 36 36 36 36 5MB (1) 256K x (1) 512K x (1) 512K x NONE 36 36 36 5MB (1) 256K x (1) 1M x 36 NONE NONE 36 6MB (1) 1M x 36 (1) 256K x (1) 256K x NONE 36 36 6MB (1) 1M x 36 (1) 512K x NONE NONE 36 6MB (1) 512K x (1) 512K x (1) 512K x NONE 36 36 36 DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 6MB (1) 512K x (1) 1M x 36 NONE NONE 36 7MB (1) 1M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 7MB (1) 256K x (1) 512K x (1) 512K x (1) 512K x 36 36 36 36 8MB (1) 2M x 36 NONE NONE NONE 8MB (1) 1M x 36 (1) 512K x (1) 512K x NONE 36 36 8MB (1) 1M x 36 (1) 1M x 36 NONE NONE 8MB (1) 512K x (1) 512K x (1) 512K x (1) 512K x 36 36 36 36 9MB (1) 2M x 36 (1) 256K x NONE NONE 36 9MB (1) 256K x (1) 1M x 36 (1) 1M x 36 NONE 36 9MB (1) 256K x (1) 2M x 36 NONE NONE 36 10MB (1) 2M x 36 (1) 256K x (1) 256K x NONE 36 36 10MB (1) 2M x 36 (1) 512K x NONE NONE 36 10MB (1) 1M x 36 (1) 512K x (1) 512K x (1) 512K x 36 36 36 10MB (1) 512K x (1) 1M x 36 (1) 1M x 36 NONE 36 10MB (1) 512K x (1) 2M x 36 NONE NONE 36 11MB (1) 2M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 12MB (1) 2M x 36 (1) 512K x (1) 512K x NONE 36 36 12MB (1) 2M x 36 (1) 1M x 36 NONE NONE 12MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 NONE 12MB (1) 1M x 36 (1) 2M x 36 NONE NONE 13MB (1) 256K x (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 36 14MB (1) 2M x 36 (1) 512K x (1) 512K x (1) 512K x 36 36 36 14MB (1) 512K x (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 36 16MB (1) 4M x 36 NONE NONE NONE 16MB (1) 2M x 36 (1) 1M x 36 (1) 1M x 36 NONE 16MB (1) 2M x 36 (1) 2M x 36 NONE NONE 16MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 17MB (1) 4M x 36 (1) 256K x NONE NONE 36 17MB (1) 256K x (1) 2M x 36 (1) 2M x 36 NONE 36 17MB (1) 256K x (1) 4M x 36 NONE NONE 36 18MB (1) 4M x 36 (1) 256K x (1) 256K x NONE 36 36 18MB (1) 4M x 36 (1) 512K x NONE NONE 36 18MB (1) 512K x (1) 2M x 36 (1) 2M x 36 NONE 36 18MB (1) 512K x (1) 4M x 36 NONE NONE 36 19MB (1) 4M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 20MB (1) 4M x 36 (1) 512K x (1) 512K x NONE 36 36 20MB (1) 4M x 36 (1) 1M x 36 NONE NONE 20MB (1) 2M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 20MB (1) 1M x 36 (1) 2M x 36 (1) 2M x 36 NONE 20MB (1) 1M x 36 (1) 4M x 36 NONE NONE 22MB (1) 4M x 36 (1) 512K x (1) 512K x (1) 512K x 36 36 36 24MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 NONE 24MB (1) 4M x 36 (1) 2M x 36 NONE NONE DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 24MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 NONE 24MB (1) 2M x 36 (1) 4M x 36 NONE NONE 25MB (1) 256K x (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 36 26MB (1) 512K x (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 36 28MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 28MB (1) 1M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 32MB (1) 8M x 36 NONE NONE NONE 32MB (1) 4M x 36 (1) 2M x 36 (1) 2M x 36 NONE 32MB (1) 4M x 36 (1) 4M x 36 NONE NONE 32MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 33MB (1) 8M x 36 (1) 256K x NONE NONE 36 33MB (1) 256K x (1) 4M x 36 (1) 4M x 36 NONE 36 33MB (1) 256K x (1) 8M x 36 NONE NONE 36 34MB (1) 8M x 36 (1) 256K x (1) 256K x NONE 36 36 34MB (1) 8M x 36 (1) 512K x NONE NONE 36 34MB (1) 512K x (1) 4M x 36 (1) 4M x 36 NONE 36 34MB (1) 512K x (1) 8M x 36 NONE NONE 36 35MB (1) 8M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 36MB (1) 8M x 36 (1) 512K x (1) 512K x NONE 36 36 36MB (1) 8M x 36 (1) 1M x 36 NONE NONE 36MB (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 NONE 36MB (1) 1M x 36 (1) 8M x 36 NONE NONE 38MB (1) 8M x 36 (1) 512K x (1) 512K x (1) 512K x 36 36 36 40MB (1) 8M x 36 (1) 1M x 36 (1) 1M x 36 NONE 40MB (1) 8M x 36 (1) 2M x 36 NONE NONE 40MB (1) 4M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 40MB (1) 2M x 36 (1) 4M x 36 (1) 4M x 36 NONE 40MB (1) 2M x 36 (1) 8M x 36 NONE NONE 44MB (1) 8M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 48MB (1) 8M x 36 (1) 2M x 36 (1) 2M x 36 NONE 48MB (1) 8M x 36 (1) 4M x 36 NONE NONE 48MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 NONE 48MB (1) 4M x 36 (1) 8M x 36 NONE NONE 49MB (1) 256K x (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 36 50MB (1) 512K x (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 36 52MB (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 56MB (1) 8M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 56MB (1) 2M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 64MB (1) 8M x 36 (1) 4M x 36 (1) 4M x 36 NONE 64MB (1) 8M x 36 (1) 8M x 36 NONE NONE 64MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 65MB (1) 256K x (1) 8M x 36 (1) 8M x 36 NONE 36 66MB (1) 512K x (1) 8M x 36 (1) 8M x 36 NONE 36 DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 68MB (1) 1M x 36 (1) 8M x 36 (1) 8M x 36 NONE 72MB (1) 2M x 36 (1) 8M x 36 (1) 8M x 36 NONE 80MB (1) 8M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 80MB (1) 4M x 36 (1) 8M x 36 (1) 8M x 36 NONE 96MB (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 NONE 97MB (1) 256K x (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 36 98MB (1) 512K x (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 36 100MB (1) 1M x 36 (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 104MB (1) 2M x 36 (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 112MB (1) 4M x 36 (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 128MB (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 CACHE CONFIGURATION Size Bank 0 TAG 128KB (4) 32K x 8 (1) 8K x 8 256KB (4) 64K x 8 (1) 16K x 8 512KB (4) 128K x 8 (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP7 JP8 128KB pins 1 & 2 closed pins 1 & 2 closed 256KB pins 1 & 2 closed pins 2 & 3 closed 512KB pins 2 & 3 closed pins 2 & 3 closed CPU TYPE CONFIGURATION Type JP9 JP10 JP14 JP15 JP16 (SL)AM486SX (WB) 2 & 3 1 & 2 Open 1 & 2 1 & 2 (SL)AM486SX (WT) 2 & 3 1 & 2 Open 1 & 2 2 & 3 80486SX Open 2 & 3 Open Open Open SL80486SX Open 2 & 3 Open Open Open UMC486 2 & 3 Open Open Open Open CXM7 2 & 3 2 & 3 Open Open Open AM486DX 2 & 3 2 & 3 Open Open 1 & 2 (SL)AM486DX (WB) 2 & 3 1 & 2 Open 1 & 2 1 & 2 (SL)AM486DX (WT) 2 & 3 1 & 2 Open 1 & 2 2 & 3 80486DX 2 & 3 2 & 3 Open Open 1 & 2 SL80486DX 2 & 3 2 & 3 Open Open Open AM486DX2 2 & 3 2 & 3 Open Open 2 & 3 (SL)AM486DX2 (WB) 2 & 3 1 & 2 Open 1 & 2 1 & 2 (SL)AM486DX2 (WT) 2 & 3 1 & 2 Open 1 & 2 2 & 3 80486DX2 2 & 3 2 & 3 Open Open 1 & 2 SL80486DX2 2 & 3 2 & 3 Open Open Open AM486DX4 2 & 3 2 & 3 Open Open 1 & 2 (SL)AM486DX4 (2x 2 & 3 1 & 2 Open 1 & 2 1 & 2 WB) (SL)AM486DX4 (3x 2 & 3 1 & 2 Open 1 & 2 1 & 2 WB) (SL)AM486DX4 (2x 2 & 3 1 & 2 Open 1 & 2 2 & 3 WT) (SL)AM486DX4 (3x 2 & 3 1 & 2 Open 1 & 2 2 & 3 WT) 80486DX4 (2x) 2 & 3 2 & 3 Open Open 1 & 2 80486DX4 (2.5x) 2 & 3 2 & 3 Open Open 1 & 2 80486DX4 (3x) 2 & 3 2 & 3 Open Open 1 & 2 SL80486DX4 (2x) 2 & 3 2 & 3 Open Open Open SL80486DX4 (2.5x) 2 & 3 2 & 3 Open Open Open SL80486DX4 (3x) 2 & 3 2 & 3 Open Open Open CXM9 (2x) 2 & 3 1 & 2 Open 1 & 2 Open CXM9 (3x) 2 & 3 1 & 2 Open 1 & 2 Open P24D (WB) 2 & 3 1 & 2 Open 1 & 2 1 & 2 P24D (WT) 2 & 3 1 & 2 Open 1 & 2 2 & 3 P24T (WB) 1 & 2 1 & 2 1 & 2 Open Open P24T (WT) 1 & 2 1 & 2 2 & 3 Open Open Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type JP17 JP20 JP21 JP23 JP24 (SL)AM486SX (WB) 2 & 3 Closed Open 2 & 3 4 & 5 (SL)AM486SX (WT) 2 & 3 Closed Open 2 & 3 4 & 5 80486SX Open Open Open Open Open SL80486SX 2 & 3 Closed Open 1 & 2 4 & 5 UMC486 Open Open Open Open Open CXM7 1 & 2 Closed Open Open 2 & 3 AM486DX Open Open Open Open 4 & 5 (SL)AM486DX (WB) 2 & 3 Closed Open 2 & 3 4 & 5 (SL)AM486DX (WT) 2 & 3 Closed Open 2 & 3 4 & 5 80486DX Open Open Open Open 4 & 5 SL80486DX 2 & 3 Closed Open 1 & 2 4 & 5 AM486DX2 Open Open Open Open 4 & 5 (SL)AM486DX2 (WB) 2 & 3 Closed Open 2 & 3 4 & 5 (SL)AM486DX2 (WT) 2 & 3 Closed Open 2 & 3 4 & 5 80486DX2 Open Open Open Open 4 & 5 SL80486DX2 2 & 3 Closed Open 1 & 2 4 & 5 AM486DX4 Open Open Open Open 4 & 5 (SL)AM486DX4 (2x 2 & 3 Closed Open 2 & 3 4 & 5 WB) (SL)AM486DX4 (3x 2 & 3 Closed Open 2 & 3 4 & 5 WB) (SL)AM486DX4 (2x 2 & 3 Closed Open 2 & 3 4 & 5 WT) (SL)AM486DX4 (3x 2 & 3 Closed Open 2 & 3 4 & 5 WT) 80486DX4 (2x) Open Open Open Open 4 & 5 80486DX4 (2.5x) Open Open Open Open 4 & 5 80486DX4 (3x) Open Open Open Open 4 & 5 SL80486DX4 (2x) 2 & 3 Closed Open 1 & 2 4 & 5 SL80486DX4 (2.5x) 2 & 3 Closed Open 1 & 2 4 & 5 SL80486DX4 (3x) 2 & 3 Closed Open 1 & 2 4 & 5 CXM9 (2x) 2 & 3 Closed Open 2 & 3 4 & 5 CXM9 (3x) 2 & 3 Closed Open 2 & 3 4 & 5 P24D (WB) 2 & 3 Closed Open 2 & 3 4 & 5 P24D (WT) 2 & 3 Closed Open 2 & 3 4 & 5 P24T (WB) 2 & 3 Closed Open Open 1 & 2 P24T (WT) 2 & 3 Closed Open Open 1 & 2 Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type JP25 JP26 JP28 JP29 JP30 (SL)AM486SX (WB) 2 & 3 1 & 2, Open 1 & 2 Open 3 & 4 (SL)AM486SX (WT) 2 & 3 1 & 2, Open 1 & 2 Open 3 & 4 80486SX 2 & 3 Open Open Open Open SL80486SX 2 & 3 3 & 4 Open Open Open UMC486 2 & 3 Open Open Open Open CXM7 1 & 2, 2 & 3 2 & 3 2 & 3 Open 3 & 4 AM486DX 1 & 2, 3 & 4 Open Open Open 3 & 4 (SL)AM486DX (WB) 1 & 2, 1 & 2, Open 1 & 2 Open 3 & 4 3 & 4 (SL)AM486DX (WT) 1 & 2, 1 & 2, Open 1 & 2 Open 3 & 4 3 & 4 80486DX 1 & 2, 3 & 4 Open Open Open 3 & 4 SL80486DX 1 & 2, 3 & 4 Open Open Open 3 & 4 AM486DX2 1 & 2, 3 & 4 Open Open Open 3 & 4 (SL)AM486DX2 (WB) 1 & 2, 1 & 2, Open 1 & 2 Open 3 & 4 3 & 4 (SL)AM486DX2 (WT) 1 & 2, 1 & 2, Open 1 & 2 Open 3 & 4 3 & 4 80486DX2 1 & 2, 3 & 4 Open Open Open 3 & 4 SL80486DX2 1 & 2, 3 & 4 Open Open Open 3 & 4 AM486DX4 1 & 2, 3 & 4 Open Open Open 3 & 4 (SL)AM486DX4 (2x 1 & 2, 1 & 2, Open 1 & 2 2 & 3 WB) 3 & 4 3 & 4 (SL)AM486DX4 (3x 1 & 2, 1 & 2, Open 1 & 2 Open WB) 3 & 4 3 & 4 (SL)AM486DX4 (2x 1 & 2, 1 & 2, Open 1 & 2 2 & 3 WT) 3 & 4 3 & 4 (SL)AM486DX4 (3x 1 & 2, 1 & 2, Open 1 & 2 Open WT) 3 & 4 3 & 4 80486DX4 (2x) 1 & 2, 3 & 4 Open Open 2 & 3 3 & 4 80486DX4 (2.5x) 1 & 2, 3 & 4 Open Open 1 & 2 3 & 4 80486DX4 (3x) 1 & 2, 3 & 4 Open Open Open 3 & 4 SL80486DX4 (2x) 1 & 2, 3 & 4 Open Open 2 & 3 3 & 4 SL80486DX4 (2.5x) 1 & 2, 3 & 4 Open Open 1 & 2 3 & 4 SL80486DX4 (3x) 1 & 2, 3 & 4 Open Open Open 3 & 4 CXM9 (2x) 1 & 2, 1 & 2, Open 1 & 2 2 & 3 3 & 4 3 & 4 CXM9 (3x) 1 & 2, 1 & 2, Open 1 & 2 Open 3 & 4 3 & 4 P24D (WB) 1 & 2, 1 & 2, Open 1 & 2 Open 3 & 4 3 & 4 P24D (WT) 1 & 2, 1 & 2, Open 1 & 2 Open 3 & 4 3 & 4 P24T (WB) 1 & 2, 3 & 4 1 & 2 1 & 2 Open 3 & 4 P24T (WT) 1 & 2, 3 & 4 1 & 2 1 & 2 Open 3 & 4 Note: Pins designated should be in the closed position. CPU SPEED CONFIGURATION Speed JP11 JP12 25MHz pins 1 & 2 closed Open 33MHz pins 1 & 2, 3 & 4 pins 1 & 2 closed closed 40MHz pins 1 & 2 closed pins 2 & 3 closed 50iMHz pins 1 & 2 closed Open 50MHz pins 3 & 4 closed pins 2 & 3 closed 66iMHz pins 1 & 2, 3 & 4 pins 1 & 2 closed closed 80iMHz pins 1 & 2 closed pins 2 & 3 closed 100iMHz pins 1 & 2, 3 & 4 pins 1 & 2 closed closed 120iMHz pins 1 & 2 closed pins 2 & 3 closed CPU VOLTAGE CONFIGURATION Voltage JP31 JP32 JP34 3.3v pins 2 & 3 pins 5 & 6 pins 2 & 3 closed closed closed 3.45v pins 2 & 3 pins 3 & 4 pins 2 & 3 closed closed closed 4v pins 2 & 3 pins 1 & 2 pins 2 & 3 closed closed closed 5v pins 1 & 2 N/A pins 1 & 2 closed closed GREEN PC CONFIGURATION Setting JP36 Doze mode pins 1 & 2 closed Suspend mode pins 3 & 4 closed Standby mode pins 5 & 6, 7 & 8 closed CMOS CONFIGURATION Setting JP2 JP3 CMOS memory normal pins 1 & 2 closed pins 1 & 2 closed operation CMOS memory clear pins 2 & 3 closed pins 2 & 3 closed