IBM CORPORATION PC 330-486, PC 350-486 Processor 80486SX/486 Overdrive/80486DX/80486DX2/80486DX4/P24T Processor 20/25/33/40/50(internal)/50/66(internal)/75(internal)/ Speed 100(internal)MHz Chip Set Unidentified Video Chip None Set Maximum 128MB Onboard Memory Maximum Video Unidentified Memory Cache 128/256KB BIOS Unidentified Dimensions 330mm x 218mm I/O Options 32-bit VESA/PCI local bus slot, floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2),VESA feature connector, VGA port, riser slot, VRM connector NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Power LED CN1 IDE interface 2 J10 IDE interface LED CN2 VESA feature J14 connector PS/2 mouse port J2 Speaker J27 Serial port 1 J3 On/off switch J29 connector Serial port 2 J4 On/off switch power J30 supply connector Parallel port J5 Riser slot SL1 VGA port J6 32-bit VESA/PCI SL2 local bus slot Floppy drive J7 VRM connector VRM interface IDE interface 1 J9 USER CONFIGURABLE SETTINGS Function Label Position » Flash BIOS write protect J13 Pins 2 & 3 closed disabled Flash BIOS write protect J13 Pins 1 & 2 closed enabled » On board video enabled J15 Pins 1 & 2 closed On board video disabled J15 Pins 2 & 3 closed » Factory configured - do not JP2 Unidentified alter » Modem answers on ring JP5 Pins 2 & 3 closed Modem does not answer on ring JP5 Pins 1 & 2 closed » Factory configured - do not JP11 Unidentified alter » PS/2 mouse enabled JP12 Closed PS/2 mouse disabled JP12 Open » CMOS memory normal operation JP14 Pins 1 & 2 closed CMOS memory clear JP14 Pins 2 & 3 closed » VGA IRQ9 enabled JP15 Closed VGA IRQ9 disabled JP15 Open » Floppy drive write protect WP Open disabled Floppy drive write protect WP Closed enabled DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 4MB (1) 1M x 32 None None None 8MB (1) 1M x 32 (1) 1M x 32 None None 8MB (1) 2M x 32 None None None 12MB (1) 1M x 32 (1) 1M x 32 (1) 1M x 32 None 12MB (1) 1M x 32 (1) 2M x 32 None None 16MB (1) 4M x 32 None None None 16MB (1) 1M x 32 (1) 1M x 32 (1) 2M x 32 None 16MB (1) 2M x 32 (1) 2M x 32 None None 16MB (1) 1M x 32 (1) 1M x 32 (1) 1M x 32 (1) 1M x 32 20MB (1) 1M x 32 (1) 2M x 32 (1) 2M x 32 None 20MB (1) 1M x 32 (1) 4M x 32 None None DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 24MB (1) 2M x 32 (1) 2M x 32 (1) 2M x 32 None 24MB (1) 1M x 32 (1) 1M x 32 (1) 2M x 32 (1) 2M x 32 24MB (1) 1M x 32 (1) 1M x 32 (1) 4M x 32 None 28MB (1) 1M x 32 (1) 2M x 32 (1) 2M x 32 (1) 2M x 32 28MB (1) 1M x 32 (1) 1M x 32 (1) 4M x 32 (1) 1M x 32 32MB (1) 4M x 32 (1) 4M x 32 None None 32MB (1) 8M x 32 None None None 32MB (1) 2M x 32 (1) 2M x 32 (1) 4M x 32 None 32MB (1) 2M x 32 (1) 2M x 32 (1) 2M x 32 (1) 2M x 32 36MB (1) 1M x 32 (1) 4M x 32 (1) 4M x 32 None 40MB (1) 1M x 32 (1) 1M x 32 (1) 8M x 32 None 40MB (1) 1M x 32 (1) 1M x 32 (1) 4M x 32 (1) 4M x 32 48MB (1) 4M x 32 (1) 4M x 32 (1) 4M x 32 None 48MB (1) 2M x 32 (1) 2M x 32 (1) 8M x 32 None 48MB (1) 2M x 32 (1) 2M x 32 (1) 4M x 32 (1) 4M x 32 52MB (1) 1M x 32 (1) 4M x 32 (1) 4M x 32 (1) 4M x 32 64MB (1) 8M x 32 (1) 8M x 32 None None 64MB (1) 4M x 32 (1) 4M x 32 (1) 8M x 32 None 64MB (1) 4M x 32 (1) 4M x 32 (1) 4M x 32 (1) 4M x 32 68MB (1) 1M x 32 (1) 8M x 32 (1) 4M x 32 (1) 4M x 32 72MB (1) 1M x 32 (1) 1M x 32 (1) 8M x 32 (1) 8M x 32 80MB (1) 2M x 32 (1) 2M x 32 (1) 8M x 32 (1) 8M x 32 84MB (1) 1M x 32 (1) 8M x 32 (1) 8M x 32 (1) 4M x 32 96MB (1) 8M x 32 (1) 8M x 32 (1) 8M x 32 None 96MB (1) 4M x 32 (1) 4M x 32 (1) 8M x 32 (1) 8M x 32 100MB (1) 1M x 32 (1) 8M x 32 (1) 8M x 32 (1) 8M x 32 128MB (1) 8M x 32 (1) 8M x 32 (1) 8M x 32 (1) 8M x 32 Note: Board also accepts x 36 SIMMs. 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 J16 J17 J38 128KB Pins 2 & 3 closed Open Open 256KB Pins 1 & 2 closed Closed Open CPU SPEED SELECTION Speed J35 J36 J37 20MHz Closed Open Open 25MHz Open Closed Closed 33MHz Open Closed Open 40MHz Open Open Closed 50iMHz Open Closed Closed 50MHz Open Open Open 66iMHz Open Closed Open 75iMHz Open Closed Closed 100iMHz Open Closed Open CPU TYPE SELECTION Type J23 J24 80486SX Pins 1 & 2 closed Open 486 Overdrive Pins 2 & 3 closed Open 80486DX Pins 2 & 3 closed Open 80486DX2 Pins 2 & 3 closed Open 80486DX4 Pins 2 & 3 closed Open P24T Pins 2 & 3 closed Closed CPU MULTIPLIER SELECTION (80486DX4 ONLY) Multiplier JP10 Other multiplier Pins 1 & 2 closed 2x Pins 3 & 4 closed 3x Open LOCAL BUS SELECTION ON RISER SLOT Setting JP3 JP4 JP7 JP13 VESA local Pins 1 & 2 Pins 1 & 2 Open Closed bus closed closed PCI local Pins 2 & 3 Pins 2 & 3 Closed Open bus closed closed DMA CHANNEL SELECTION Channel JP8 JP9 1 Pins 2 & 3 closed Pins 2 & 3 closed 3 Pins 1 & 2 closed Pins 1 & 2 closed