ACER, INC. 486 SYSTEM (V20L) Processor AM486SX/80486SX/AM486DX/80486DX/CX486DX2/AM486DX2/ 80486DX2/P24D/P24T Processor 25/33/40/50(internal)/50/66(internal)MHz Speed Chip Set Unidentified Video Chip Set None Maximum 48MB Onboard Memory Maximum Video None Memory Cache 128/256/512KB BIOS Unidentified Dimensions 330mm x 218mm I/O Options 32-bit VESA local bus slot, floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Serial port 1 CN1 Power LED & keylock CN9 pins 1 - 4 Serial port 2 CN2 Reset switch/green PC CN9 pins 7 & connector 8 Parallel port CN3 Power LED & keylock CN10 pins 1 - 5 Floppy drive CN4 Speaker CN10 pins 7 - interface 10 IDE interface 1 CN5 Turbo LED CN10 pins 12 & 13 IDE interface 2 CN6 Turbo switch CN10 pins 15 - 17 PS/2 mouse port CN7 Reset switch CN10 pins 19 & 20 IDE interface CN8 32-bit VESA local bus SL1 LED slots USER CONFIGURABLE SETTINGS Function Label Position » Password disabled JP1 Pins 2 & 3 closed Password enabled JP1 Pins 1 & 2 closed » OEM BIOS enabled JP2 Pins 2 & 3 closed » Factory configured - do not JP2 Pins 1 & 2 closed alter » M5115 I/O enabled JP8 Pins 1 & 2 closed M5115 I/O disabled JP8 Pins 2 & 3 closed Jumper information unidentified JP10 Unidentified » Local bus IDE I/O address JP11 Pins 1 & 2 closed select 0FXH Local bus IDE I/O address JP11 Pins 2 & 3 closed select 07XH » M5213N local bus IDE enabled JP12 Pins 2 & 3 closed M5213N local bus IDE disabled JP12 Pins 1 & 2 closed » Reset key enabled JP23 Pins 1 & 2 closed Reset key disabled JP23 Pins 2 & 3 closed » Green PC connector enabled JP24 Pins 2 & 3 closed Reset switch enabled JP24 Pins 1 & 2 closed » Factory configured - do not JP41 Pins 2 & 3 closed alter DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 4MB None None (1) 1M x 36 8MB None (1) 1M x 36 (1) 1M x 36 8MB None None (1) 2M x 36 12MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 12MB (1) 2M x 36 None (1) 1M x 36 12MB (1) 1M x 36 None (1) 2M x 36 12MB None (1) 1M x 36 (1) 2M x 36 16MB None None (1) 4M x 36 16MB (1) 2M x 36 None (1) 2M x 36 16MB (1) 1M x 36 (1) 1M x 36 (1) 2M x 36 16MB (1) 2M x 36 None (1) 2M x 36 DRAM CONFIGURATION (CON'T) Size Bank 0 Bank 1 Bank 2 20MB None (1) 4M x 36 (1) 1M x 36 20MB None (1) 1M x 36 (1) 4M x 36 24MB (1) 1M x 36 (1) 4M x 36 (1) 1M x 36 24MB (1) 1M x 36 (1) 1M x 36 (1) 4M x 36 24MB (1) 2M x 36 None (1) 4M x 36 24MB (1) 2M x 36 None (1) 4M x 36 24MB (1) 4M x 36 None (1) 2M x 36 24MB None (1) 4M x 36 (1) 2M x 36 28MB (1) 4M x 36 (1) 1M x 36 (1) 2M x 36 28MB (1) 1M x 36 (1) 4M x 36 (1) 2M x 36 32MB None (1) 4M x 36 (1) 4M x 36 36MB (1) 4M x 36 (1) 4M x 36 (1) 1M x 36 36MB (1) 4M x 36 (1) 1M x 36 (1) 4M x 36 36MB (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 40MB (1) 4M x 36 (1) 4M x 36 (1) 2M x 36 48MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 128KB (4) 32K x 8 None (1) 32K x 8 256KB (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 JP13 JP15 JP16 128KB Pins 2 & 3 Pins 2 & 3 Pins 1 & 2 closed closed closed 256KB Pins 2 & 3 Pins 1 & 2 Pins 2 & 3 closed closed closed 512KB Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed CPU SPEED SELECTION Speed JP17 JP21 25MHz Pins 1 & 5 closed Pins 2 & 3 closed 33MHz Pins 2 & 6 closed Pins 2 & 3 closed 40MHz Pins 3 & 7 closed Pins 1 & 2 closed 50iMHz Pins 1 & 5 closed Pins 2 & 3 closed 50MHz Pins 4 & 8 closed Pins 1 & 2 closed 66iMHz Pins 2 & 6 closed Pins 2 & 3 closed CPU TYPE SELECTION Type JP20 JP26 JP27 AM486SX Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed 80486SX Pins 1 & 2 Pins 2 & 3 Pins 2 & 3 closed closed closed AM486DX Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed 80486DX Pins 1 & 2 Pins 2 & 3 Pins 2 & 3 closed closed closed CX486DX2 Pins 1 & 2 Pins 2 & 3 Open closed closed AM486DX2 Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed 80486DX2 Pins 1 & 2 Pins 2 & 3 Pins 2 & 3 closed closed closed P24D Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed P24T Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed CPU TYPE SELECTION (CON'T) Type JP33 JP34 JP35 JP37 AM486SX Pins 1 & 3 Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed closed 80486SX Pins 1 & 3 Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed closed AM486DX Pins 1 & 3 Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed closed 80486DX Pins 1 & 3 Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed closed CX486DX2 Pins 2 & 4 Pins 1 & 2 Pins 2 & 3 Pins 1 & 2 closed closed closed closed AM486DX2 Pins 1 & 3 Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed closed 80486DX2 Pins 1 & 3 Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed closed P24D Pins 1 & 3 Pins 2 & 3 Pins 1 & 2 Pins 2 & 3 closed closed closed closed P24T Pins 1 & 3 Pins 2 & 3 Pins 1 & 2 Pins 2 & 3 closed closed closed closed