ACER, INC. 486 VESA SYSTEM (VER. 1) Processor 80486SX/80486DX/80486DX2 Processor Speed 20/25/33/40/50(internal)/50/66(internal)MHz Chip Set Unidentified Video Chip Set None Maximum Onboard 64MB Memory Maximum Video None Memory Cache 128/256KB BIOS Unidentified Dimensions 330mm x 218mm I/O Options 32-bit VESA local bus slots (2), floppy drive interface, IDE interface, SCSI connector, parallel port, PS/2 mouse port, serial ports (2) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location PS/2 mouse port CN1 IDE interface CN8 HDD/FDD power CN2 VGA control connector J4 connector for EPA for EPA SCSI interface CN3 Chassis fan power J9 Parallel port CN4 Front panel LEDs J10 Serial port 1 CN5 Auxiliary J11 keyboard/PS/2 mouse Serial port 2 CN6 IDE interface LED J12 Floppy drive CN7 32-bit VESA local bus SL1 & SL2 interface slots USER CONFIGURABLE SETTINGS Function Label Position Jumper information unavailable CN9 Unidentified » Password check disabled JP1 Pins 2 & 3 closed Password check enabled JP1 Pins 1 & 2 closed Jumper information unavailable JP2 Unidentified SCSI IRQ select IRQ10 JP3 Pins 1 & 2 closed SCSI IRQ select IRQ11 JP3 Pins 2 & 3 closed SCSI IRQ disabled JP3 Open » Factory configured - do not JP4 Open alter » Factory configured - do not JP5 Open alter SCSI I/O address select 340h - JP6 Open 35Fh SCSI I/O address select 140h - JP6 Closed 15Fh Onboard M5105 disabled JP7 Open Onboard M5105 enabled JP7 Closed » Parallel port bidirectional JP8 Closed enabled Parallel port bidirectional JP8 Open disabled Battery type select internal JP9 Closed Battery type select external JP9 Open Reset button disabled JP23 Open Reset button enabled JP23 Closed Keylock enabled JP24 Open Keylock disabled JP24 Closed DRAM CONFIGURATION Size Bank 0A Bank 0 Bank 1 Bank 2 Bank 3 4MB 4MB None None None None 8MB 4MB None (1) 1M x None None 36 12MB 4MB None (1) 1M x (1) 1M x None 36 36 16MB (A) 4MB None (1) 1M x (1) 1M x (1) 1M x 36 36 36 16MB (B) 4MB (1) 4M x None None None 36 20MB 4MB None (1) 4M x None None 36 24MB 4MB None (1) 1M x (1) 4M x None 36 36 32MB 4MB (1) 4M x (1) 4M x None None 36 36 36MB 4MB None (1) 4M x (1) 4M x None 36 36 40MB 4MB None (1) 1M x (1) 4M x (1) 4M x 36 36 36 48MB 4MB (1) 4M x (1) 4M x (1) 4M x None 36 36 36 64MB 4MB (1) 4M x (1) 4M x (1) 4M x (1) 4M x 36 36 36 36 Note: If Bank 0 is populated, Bank 0A needs to be disabled with JP15.. DRAM JUMPER CONFIGURATION Size JP15 4MB Pins 2 & 3 closed 8MB Pins 2 & 3 closed 12MB Pins 2 & 3 closed 16MB (A) Pins 2 & 3 closed 16MB (B) Pins 1 & 2 closed 20MB Pins 2 & 3 closed 24MB Pins 2 & 3 closed 32MB Pins 1 & 2 closed 36MB Pins 2 & 3 closed 40MB Pins 2 & 3 closed 48MB Pins 1 & 2 closed 64MB Pins 1 & 2 closed 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 CACHE JUMPER CONFIGURATION Size JP17 JP20 128KB Open Pins 1 & 2 closed 256KB Closed Pins 2 & 3 closed CPU SPEED SELECTION Speed JP10 20MHz Pins 1 & 6 closed 25MHz Pins 2 & 7 closed 33MHz Pins 3 & 8 closed 40MHz Pins 4 & 9 closed 50iMHz Pins 2 & 7 closed 50MHz Pins 5 & 10 closed 66iMHz Pins 3 & 8 closed VL BUS WAIT STATE SELECTION Setting JP11 » 0 Open 1 Closed