MYLEX CORPORATION MGI 486 Processor 80486SX/80486SX2/UMCU5/CX486DX/AM486DX/AM486DXL/80486DX/ CX486DX2/ AM486DX2/AM486DXL2/80486DX2/80486DX4/P24D/Pentium Overdrive Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz Speed Chip Set SIS Max. 64MB 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 Green PC connector D4 Reset switch J5 Green PC connector J1 Turbo switch J6 Power LED & keylock J2 Turbo LED J7 Speaker J3 Green PC connector JP13 External battery J4 32-bit VESA local bus SL1 - SL3 slots USER CONFIGURABLE SETTINGS Function Jumper Position » CMOS memory normal operation JP11 pins 1 & 2 closed CMOS memory clear JP11 pins 2 & 3 closed » Factory configured - do not RP1 N/A alter DRAM CONFIGURATION (OPTION 1) Size Bank 0 Bank 1 Bank 2 1MB (4) 256K x 9 NONE NONE 4MB (4) 1M x 9 NONE NONE 16MB (4) 4M x 9 NONE NONE 64MB (4) 16M x 9 NONE NONE DRAM CONFIGURATION (OPTION 2) Size Bank 0 Bank 1 Bank 2 1MB NONE (1) 256K x 36 NONE 2MB NONE (1) 256K x 36 (1) 256K x 36 4MB NONE (1) 1M x 36 NONE 5MB NONE (1) 256K x 36 (1) 1M x 36 8MB NONE (1) 1M x 36 (1) 1M x 36 16MB NONE (1) 4M x 36 NONE 20MB NONE (1) 1M x 36 (1) 4M x 36 32MB NONE (1) 4M x 36 (1) 4M x 36 DRAM CONFIGURATION (OPTION 3) Size Bank 0 Bank 1 Bank 2 2MB NONE (1) 512K x 36 NONE 8MB NONE (1) 2M x 36 NONE 10MB NONE (1) 512K x 36 (1) 2M x 36 16MB NONE (1) 2M x 36 (1) 2M x 36 32MB NONE (1) 8M x 36 NONE 40MB NONE (1) 2M x 36 (1) 8M x 36 64MB NONE (1) 8M x 36 (1) 8M x 36 DRAM CONFIGURATION (OPTION 4) Size Bank 0 Bank 1 Bank 2 2MB (4) 256K x 9 (1) 256K x 36 NONE 5MB (4) 256K x 9 (1) 1M x 36 NONE 6MB (4) 256K x 9 (1) 256K x 36 (1) 1M x 36 8MB (4) 1M x 9 (1) 1M x 36 NONE 12MB (4) 1M x 9 (1) 1M x 36 (1) 1M x 36 18MB (4) 256K x 9 (1) 256K x 36 (1) 4M x 36 20MB (4) 1M x 9 (1) 4M x 36 NONE 24MB (4) 1M x 9 (1) 1M x 36 (1) 4M x 36 32MB (4) 4M x 9 (1) 4M x 36 NONE 36MB (4) 1M x 9 (1) 4M x 36 (1) 4M x 36 48MB (4) 4M x 9 (1) 4M x 36 (1) 4M x 36 DRAM CONFIGURATION (OPTION 5) Size Bank 0 Bank 1 Bank 2 12MB (4) 1M x 9 (1) 2M x 36 NONE 16MB (4) 1M x 9 (1) 2M x 36 (1) 1M x 36 36MB (4) 1M x 9 (1) 8M x 36 NONE 48MB (4) 4M x 9 (1) 8M x 36 NONE 64MB (4) 4M x 9 (1) 8M x 36 (1) 4M x 36 DRAM RESISTOR CONFIGURATION Setting RP7 RP8 RP9 RP10 Option 1 Not Not Not Installed installed installed installed Option 2 Not Installed Not Not installed installed installed Option 3 Installed Not Not Not installed installed installed Option 4 Not Not Not Installed installed installed installed Option 5 Not Not Installed Not installed installed installed 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) 16K x 8 or (1) 32K x 8 256KB (4) 64K x 8 NONE (1) 16K x 8 or (1) 32K x 8 512KB (4) 64K x 8 (4) 64K x 8 (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP9 JP20 64KB pins 1 & 2 closed pins 1 & 2 closed 128KB pins 2 & 3 closed pins 1 & 2 closed 256KB pins 2 & 3 closed pins 1 & 2 closed 256KB pins 2 & 3 closed pins 1 & 2 closed 512KB pins 2 & 3 closed pins 2 & 3 closed CACHE RESISTOR CONFIGURATION Size RP15 RP16 RP17 RP18 RP19 64KB Installed Not Not Not Not installed installed installed installed 128KB Not Installed Not Not Not installed installed installed installed 256KB Not Not Installed Not Not installed installed installed installed 256KB Not Not Not Installed Not installed installed installed installed 512KB Not Not Not Not Installed installed installed installed installed CPU TYPE CONFIGURATION Type JP3 JP17 JP18 JP21 JP23 80486SX 2 & 3 2 & 3 1 & 2 1 & 2 1 & 2 80486SX2 2 & 3 2 & 3 1 & 2 1 & 2 1 & 2 UMCU5 2 & 3 2 & 3 1 & 2 1 & 2 1 & 2 CX486DX 1 & 2 1 & 2 1 & 2 1 & 2 1 & 2 80486DX 2 & 3 2 & 3 1 & 2 1 & 2 1 & 2 80486DX2 2 & 3 2 & 3 1 & 2 1 & 2 1 & 2 80486DX4 2 & 3 2 & 3 1 & 2 1 & 2 1 & 2 P24D 2 & 3 2 & 3 1 & 2 1 & 2 1 & 2 P24T 2 & 3 2 & 3 1 & 2 1 & 2 2 & 3 Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type RP3 RP4 RP5 RP6 RP30 RP31 80486SX Not Not Installed Not Not Installed installed installed installed installed 80486SX2 Not Not Installed Not Not Installed installed installed installed installed UMCU5 Not Not Installed Not Not Installed installed installed installed installed CX486DX Installed Not Not Not Installed Not installed installed installed installed 80486DX Installed Not Not Not Not Installed installed installed installed installed 80486DX2 Installed Not Not Not Not Installed installed installed installed installed 80486DX4 Installed Not Not Not Not Installed installed installed installed installed P24D Not Installed Not Installed Not Not installed installed installed installed P24T Installed Not Not Not Not Installed installed installed installed installed CPU SPEED CONFIGURATION (MX8315/UM9515 CLOCK) Speed JP5 JP6 JP7 25MHz Open Open Closed 33MHz Closed Closed Closed 40MHz Open Closed Closed 50iMHz Open Open Closed 50MHz Closed Open Open 66iMHz Closed Closed Closed 75iMHz Open Open Closed 100iMHz Closed Closed Closed CPU SPEED CONFIGURATION (IMI SC466 CLOCK) Speed JP5 JP6 JP7 25MHz Open Open Open 33MHz Closed Closed Open 40MHz Open Closed Open 50iMHz Open Open Open 50MHz Closed Open Open 66iMHz Closed Closed Open 75iMHz Open Open Open 100iMHz Closed Closed Open CPU CORE FREQUENCY CONFIGURATION CPU JP22 JP27 Cyrix pins 1 & 2 closed Open AMD486DX2 Open Closed Intel 80486DX (3x) Open Open AMD486DX4 Open Open Intel 80486DX4 (2x) pins 2 & 3 closed Open CPU VOLTAGE CONFIGURATION Voltage JP1 JP2 JP4 JP24 3.3v Open Open Open pins 1 & 2 closed 4.0v Open Open Open pins 2 & 3 closed 5.0v Closed Closed Closed Open VESA WAIT STATE CONFIGURATION Wait states JP15 0 wait states pins 1 & 2 closed 1 wait state pins 2 & 3 closed BUS SPEED CONFIGURATION CPU speed JP16 <= 33MHz pins 1 & 2 closed > 33MHz pins 2 & 3 closed