ATC/UNITRON COMPUTERS & COMPUTER PARTS U6931/G/E/C Processor CX486M6/80486SX/80487SX/CX486M7/80486DX/80486DX2/80486DX4/ P24D/P24T Processor 25/33/40/50(internal)/50/66(internal)/75(internal/100(internal)MHz Speed Chip Set OPTI Max. 128MB Onboard DRAM Cache 64/128/256/512KB BIOS Award Dimensions 250mm x 220mm I/O 32-bit VESA local bus slots (3), green PC connector Options NPU None Options [Image] CONNECTIONS Purpose Location Purpose Location External battery J2 Speaker JP38 Power LED & keylock JP22 Green PC connector JP39 Turbo LED JP34 Reset switch S1 Turbo switch JP36 32-bit VESA local bus SL1 - SL3 slots USER CONFIGURABLE SETTINGS Function Jumper Position Monitor type select JP1 Open monochrome/EGA/VGA Monitor type select color/CGA JP1 Closed » CMOS memory normal operation JP2 Pins 2 & 3 closed CMOS memory clear JP2 Pins 1 & 2 closed » Factory configured - do not alter JP6 Open » Factory configured - do not alter JP7 Closed P24D write back enabled JP19 Pins 1 & 2 closed P24D write through enabled JP19 Pins 2 & 3 closed CPU type select any CPU except JP22 Open CX486M7 2x CPU type select CX486M7 2x only JP22 Closed » Factory configured - do not alter JP31 Pins 2 & 3 closed » Factory configured - do not alter JP41 N/A DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 2MB (4) 256K x 9 (1) 256K x None None 36 2MB None (1) 512K x None None 36 4MB (4) 1M x 9 None None None 4MB None (1) 1M x 36 None None 8MB (4) 1M x 9 (1) 1M x 36 None None 8MB None (1) 2M x 36 None None 16MB (4) 4M x 9 None None None 16MB None (1) 4M x 36 None None 16MB (4) 1M x 9 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 16MB None (1) 2M x 36 (1) 2M x 36 None 32MB (4) 4M x 9 (1) 4M x 36 None None 32MB None (1) 4M x 36 (1) 4M x 36 None 64MB None (1) 16M x 36 None None 64MB (4) 4M x 9 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 128MB None (1) 16M x 36 (1) 16M x None 36 DRAM JUMPER CONFIGURATION Setting JP5 30-pin SIMM as Bank 0 Pins 2 & 3 closed 72-pin SIMM as Bank 0 Pins 1 & 2 closed 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 (A) (4) 32K x 8 (4) 32K x 8 (1) 16K x 8 256KB (B) (4) 32K x 8 (4) 32K x 8 (1) 32K x 8 512KB (4) 128K x 8 None (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP8 JP27 JP28 JP43 JP44 64KB 2 & 3 Open Open Open 1 & 2 128KB 1 & 2 Closed Open Open 1 & 2 256KB (A) 2 & 3 Closed Closed Open 2 & 3 256KB (B) 2 & 3 Closed Closed Open 1 & 2 512KB 1 & 2 Closed Closed Closed 1 & 2 Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION Type JP9 JP11 JP12 JP13 JP15 JP23 JP32 CX486M6 Closed 2 & 3 2 & 3 Open Open 2 & 3 1 & 2 80486SX Open 1 & 2 Open Open Open 2 & 3 Open 80487SX Open 1 & 2 Open 2 & 3 Open 1 & Open 2, 3 & 4 CX486M7 Closed 2 & 3 2 & 3 1 & 2 Open 1 & Open 2, 3 & 4 80486DX Open 1 & 2 Open 1 & 2 Open 1 & Open 2, 3 & 4 80486DX2 Open 1 & 2 Open 1 & 2 Open 1 & Open 2, 3 & 4 P24D Open 2 & 3 Open 1 & 2 Closed 1 & 2 & 3 2, 3 & 4 80486DX4 N/A 1 & 2 1 & 2 1 & 2 N/A 1 & Open 2, 3 & 4 P24T Open 2 & 3 Open 1 & 2 Closed 1 & 2 & 3 2, 3 & 4 Note: Pins designated should be in the closed position. See also JP19 & JP22 in User Configurable. CPU TYPE CONFIGURATION Type JP10 JP12 JP20 JP21 Non SL-enhanced Open Open Open Open SL-enhanced Closed Pins 1 & 2 Closed Closed closed CPU SPEED CONFIGURATION Speed JP16 JP17 JP18 25MHz Open Open Open 33MHz Open Closed Closed 40MHz Open Closed Open 50iMHz Open Open Open 50MHz Open Open Closed 66iMHz Open Closed Closed 75iMHz Open Open Open 100iMHz Open Closed Closed CPU SPEED CONFIGURATION (80486DX4 ONLY) Speed JP30 2x Pins 1 & 2 closed 2.5x Pins 2 & 3 closed 3x Open CPU VOLTAGE CONFIGURATION Voltage JP29 3.45v Pins 3 & 5, 4 & 6 closed 5v Pins 1 & 3, 2 & 4 closed VL BUS WAIT STATE CONFIGURATION Wait states JP35 0 wait states Open 1 wait state Closed VL BUS SPEED CONFIGURATION CPU speed JP33 JP37 <= 33MHz Pins 2 & 3 closed Open > 33MHz Pins 1 & 2 closed Closed