DIGITAL EQUIPMENT CORPORATION DECPC LP Device Type Mainboard Processor 80486SX/80486DX/80486DX2 Processor Speed 25/33/50(internal)/66(internal)MHz Chip Set OPTI Video Chip Set Unidentified Maximum Onboard 64MB Memory Maximum Video 1MB Memory Cache 64KB BIOS Unidentified Dimensions 254mm x 218mm I/O Options Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, VGA port, riser slot NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location VGA port CN1 IDE interface CN6 Parallel port CN2 Floppy drive interface CN7 Serial port 2 CN3 VGA feature connector CN8 Serial port 1 CN4 CPU board connectors CN9 PS/2 mouse port CN5 Riser slot SL1 USER CONFIGURABLE SETTINGS Function Label Position » VGA IRQ9 disabled J1 Open VGA IRQ9 enabled J1 Closed » On board video disabled J2 Open On board video enabled J2 Closed » CMOS memory normal operation J3 Pins 1 & 2 closed CMOS memory clear J3 Pins 2 & 3 closed Reset switch enabled J4 Closed Reset switch disabled J4 Open Parallel port unidirectional J5 Pins 1 & 2 closed Parallel port bidirectional J5 Pins 2 & 3 closed » Factory configured - do not alter J10 Open » Monitor type select color J11 Closed Monitor type select monochrome J11 Open » Factory configured - do not alter J29 Open » Factory configured - do not alter J30 Open » Factory configured - do not alter J31 Open VGAIOW select local J35 Pins 1 & 2 closed VGAIOW select local & ISA J35 Pins 2 & 3 closed SIMM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 4MB (1) 1M x 36 None None None 8MB (1) 2M x 36 None None None 8MB (1) 1M x 36 (1) 1M x 36 None None 12MB (1) 2M x 36 (1) 1M x 36 None None 12MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 None SIMM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 12MB (1) 1M x 36 (1) 2M x 36 None None 16MB (1) 4M x 36 None None None 16MB (1) 2M x 36 (1) 1M x 36 (1) 1M x 36 None 16MB (1) 2M x 36 (1) 2M x 36 None None 16MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 20MB (1) 4M x 36 (1) 1M x 36 None None 20MB (1) 2M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 20MB (1) 1M x 36 (1) 2M x 36 (1) 2M x 36 None 20MB (1) 1M x 36 (1) 4M x 36 None None 24MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 None 24MB (1) 4M x 36 (1) 2M x 36 None None 24MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 None 24MB (1) 2M x 36 (1) 4M x 36 None None 28MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 32MB (1) 8M x 36 None None None 32MB (1) 4M x 36 (1) 4M x 36 None None 32MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 36MB (1) 8M x 36 (1) 1M x 36 None None 40MB (1) 8M x 36 (1) 1M x 36 (1) 1M x 36 None 40MB (1) 8M x 36 (1) 2M x 36 None None 40MB (1) 4M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 40MB (1) 2M x 36 (1) 4M x 36 (1) 4M x 36 None 40MB (1) 2M x 36 (1) 8M x 36 None None 44MB (1) 8M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 48MB (1) 8M x 36 (1) 2M x 36 (1) 2M x 36 None 48MB (1) 8M x 36 (1) 4M x 36 None None 48MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 None 48MB (1) 4M x 36 (1) 8M x 36 None None 56MB (1) 8M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 56MB (1) 2M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 64MB (1) 8M x 36 (1) 4M x 36 (1) 4M x 36 None 64MB (1) 8M x 36 (1) 8M x 36 None None 64MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 VIDEO MEMORY CONFIGURATION Note: Board accepts 512KB/1MB of video memory. The configuration is unidentified. VIDEO MEMORY JUMPER CONFIGURATION Size J28 512KB Pins 1 & 2 closed 1MB Pins 2 & 3 closed [Image] CONNECTIONS Purpose Location CPU board connectors CN9 CACHE CONFIGURATION Size Bank 0 128KB (4) 32K x 8 256KB (4) 64K x 8 CACHE JUMPER CONFIGURATION Size J103 J104 128KB Pins 1 & 2 closed Pins 1 & 2 closed 256KB Pins 2 & 3 closed Pins 2 & 3 closed CPU SPEED SELECTION Speed J109 J110 J111 J112 33MHz Closed Open Open Open 66iMHz Closed Open Open Open CPU TYPE SELECTION Type J114 J115 80486SX Pins 2 & 3 closed Pins 2 & 3 closed 80486DX Pins 1 & 2 closed Pins 1 & 2 closed CPU SECOND SOCKET SELECTION Setting J101 J102 J103 Not installed Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed ODP486 Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed 80486DX Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed 80486DX2 Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed [Image] CONNECTIONS Purpose Location CPU board connectors CN9 CACHE CONFIGURATION Size Bank 0 128KB (4) 32K x 8 256KB (4) 64K x 8 CACHE JUMPER CONFIGURATION Size J103 J104 128KB Pins 1 & 2 closed Pins 1 & 2 closed 256KB Pins 2 & 3 closed Pins 2 & 3 closed CPU SPEED SELECTION Speed J109 J110 J111 J112 25MHz Closed Open Open Open 50iMHz Closed Open Open Open CPU SECOND SOCKET SELECTION Setting J101 J102 J103 Not installed Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed ODP486 Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed 80486DX Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed 80486DX2 Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed