ATC/UNITRON COMPUTERS & COMPUTER PARTS U 6921 Processor umc486/(SL)AM486SX/80486SX/SL80486SX/CXM7/AM486DX/(SL)AM486DX/80486DX/SL80486DX/AM486DX2/(SL)AM486D2/80486DX2/SL80486DX2/ AM486DX4/(SL)486DX4/80486DX4/SL80486DX4/CXM9/P24D/P24T Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(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), green PC connector, IDE interfaces (2) Options NPU None Options [Image] CONNECTIONS Purpose Location Purpose Location External battery JP1 Turbo LED JP38 IDE interface 2 JP7 Reset switch JP39 IDE interface 1 JP8 Turbo switch JP40 Speaker JP28 Power LED & keylock JP41 IDE interface LED JP32 Green PC LED LED1 Green PC connector JP36 32-bit PCI slots PC1 - PC3 USER CONFIGURABLE SETTINGS Function Jumper Position » Monitor type select color JP6 Closed Monitor type select monochrome JP6 Open » Factory configured - do not JP14 N/A alter » Factory configured - do not JP15 N/A alter » Flash BIOS EPROM JP21 Open Flash BIOS voltage select 12v JP21 Pins 1 & 2 closed Flash BIOS voltage select 5v JP21 Pins 2 & 3 closed Turbo enabled JP40 Pins 2 & 3 closed Turbo disabled JP40 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 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 DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 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 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 DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 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 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) 32K x 8 512KB (4) 128K x 8 (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP9 JP10 128KB Pins 1 & 2 closed Pins 1 & 2 closed 256KB Pins 2 & 3 closed Pins 1 & 2 closed 512KB Pins 2 & 3 closed Pins 2 & 3 closed CPU TYPE CONFIGURATION Type JP11 JP12 JP17 JP18 JP19 UMC486 2 & 3 Open Open Open Open (SL)AM486SX 2 & 3 2 & 3 Open 2 & 3 1 & 2 804846SX Open 2 & 3 Open Open Open SL804846SX Open 2 & 3 Open Open Open CXM7 2 & 3 2 & 3 Open Open Open AM486DX 2 & 3 2 & 3 Open Open 1 & 2 (SL)AM486DX 2 & 3 2 & 3 Open 2 & 3 1 & 2 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 2 & 3 2 & 3 Open 2 & 3 1 & 2 80486DX2 2 & 3 2 & 3 Open Open Open SL80486DX2 2 & 3 2 & 3 Open Open Open AM486DX4 2 & 3 2 & 3 Open Open 1 & 2 (SL)AM486DX4 2 & 3 2 & 3 Open 2 & 3 1 & 2 80486DX4 (2x) 2 & 3 2 & 3 Open Open 1 & 2 SL80486DX4 (2x) 2 & 3 2 & 3 Open Open Open 80486DX4 (2.5x) 2 & 3 2 & 3 Open Open 1 & 2 SL80486DX4 (2.5x) 2 & 3 2 & 3 Open Open Open 80486DX4 (3x) 2 & 3 2 & 3 Open Open 1 & 2 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 2 & 3 Open Open P24T (WT) 1 & 2 1 & 2 1 & 2 Open Open Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type JP20 JP22 JP23 JP24 JP25 UMC486 Open Open Open Open Open (SL)AM486SX 2 & 3 Closed Open 4 & 5 4 & 5 804846SX Open Open Open Open Open SL804846SX 2 & 3 Closed Open 1 & 2 4 & 5 CXM7 1 & 2 Closed Open Open 2 & 3 AM486DX Open Open Open Open 4 & 5 (SL)AM486DX 2 & 3 Closed Open 4 & 5 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 2 & 3 Closed Open 4 & 5 4 & 5 80486DX2 2 & 3 Closed Open 1 & 2 4 & 5 SL80486DX2 2 & 3 Closed Open 1 & 2 4 & 5 AM486DX4 Open Open Open Open 4 & 5 (SL)AM486DX4 2 & 3 Closed Open 4 & 5 4 & 5 80486DX4 (2x) Open Open Open Open 4 & 5 SL80486DX4 (2x) 2 & 3 Closed Open 1 & 2 4 & 5 80486DX4 (2.5x) Open Open Open Open 4 & 5 SL80486DX4 2 & 3 Closed Open 1 & 2 4 & 5 (2.5x) 80486DX4 (3x) Open Open Open Open 4 & 5 SL80486DX4 (3x) 2 & 3 Closed Open 1 & 2 4 & 5 CXM9 (2x) Open Closed Open 2 & 3 2 & 3 CXM9 (3x) Open Closed Open 2 & 3 2 & 3 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 JP26 JP27 JP29 JP33 JP34 UMC486 2 & 3 Open Open Open Open (SL)AM486SX 2 & 3 3 & 4 Open Open 1 & 2 804846SX 2 & 3 Open Open Open Open SL804846SX 2 & 3 3 & 4 Open Open Open CXM7 1 & 2, 3 2 & 3 Open 2 & 3 2 & 3 & 4 AM486DX 1 & 2, 3 3 & 4 Open Open Open & 4 (SL)AM486DX 1 & 2, 3 3 & 4 Open Open 1 & 2 & 4 80486DX 1 & 2, 3 3 & 4 Open Open Open & 4 SL80486DX 1 & 2, 3 3 & 4 Open Open Open & 4 AM486DX2 1 & 2, 3 3 & 4 Open Open Open & 4 (SL)AM486DX2 1 & 2, 3 3 & 4 Open Open 1 & 2 & 4 80486DX2 1 & 2, 3 3 & 4 Open Open Open & 4 SL80486DX2 1 & 2, 3 3 & 4 Open Open Open & 4 AM486DX4 1 & 2, 3 3 & 4 Open Open Open & 4 (SL)AM486DX4 1 & 2, 3 3 & 4 Open Open 1 & 2 & 4 80486DX4 (2x) 1 & 2, 3 3 & 4 2 & 3 Open Open & 4 SL80486DX4 (2x) 1 & 2, 3 3 & 4 2 & 3 Open Open & 4 80486DX4 (2.5x) 1 & 2, 3 3 & 4 1 & 2 Open Open & 4 SL80486DX4 (2.5x) 1 & 2, 3 3 & 4 1 & 2 Open Open & 4 80486DX4 (3x) 1 & 2, 3 3 & 4 Open Open Open & 4 SL80486DX4 (3x) 1 & 2, 3 3 & 4 Open Open Open & 4 CXM9 (2x) 1 & 2, 3 1 & 2, 3 2 & 3 Open 1 & 2 & 4 & 4 CXM9 (3x) 1 & 2, 3 1 & 2, 3 Open Open 1 & 2 & 4 & 4 P24D (WB) 1 & 2, 3 1 & 2, 3 Open Open 1 & 2 & 4 & 4 P24D (WT) 1 & 2, 3 1 & 2, 3 Open Open 1 & 2 & 4 & 4 P24T (WB) 1 & 2, 3 3 & 4 Open 1 & 2 1 & 2 & 4 P24T (WT) 1 & 2, 3 3 & 4 Open 1 & 2 1 & 2 & 4 Note: Pins designated should be in the closed position. CPU SPEED CONFIGURATION Speed JP13 JP16 25MHz Pins 1 & 2 closed Open 33MHz Pins 1 & 2 closed Pins 1 & 2, 3 & 4 closed 40MHz Pins 2 & 3 closed Pins 1 & 2 closed 50iMHz Pins 1 & 2 closed Open 50MHz Pins 2 & 3 closed Pins 3 & 4 closed 66iMHz Pins 1 & 2 closed Pins 1 & 2, 3 & 4 closed 75iMHz Pins 1 & 2 closed Open 100iMHz Pins 1 & 2 closed Pins 1 & 2, 3 & 4 closed CPU VOLTAGE CONFIGURATION Voltage JP30 JP31 JP35 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 Any setting Pins 1 & 2 closed closed BIOS 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 GREEN PC CONFIGURATION Setting JP37 Doze mode Pins 1 & 2 closed Suspend mode Pins 3 & 4 closed Standby mode Pins 5 & 6, 7 & 8 closed