IBM CORPORATION PS/1 TYPE 2133, 2155, 2168 (TYPE B1) Device Type Mainboard Processor 80486SX/80487SX/80486DX/80486DX2/ODP486 Processor Speed 25/33/50(internal)/66(internal)MHz Chip Set Unidentified Video Chip Set Unidentified Maximum Onboard 64MB Memory Maximum Video Unidentified Memory Cache 128/256KB BIOS Unidentified Dimensions 330mm x 218mm I/O Options 32-bit VESA local bus slot, 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 PS/2 mouse port J2 IDE interface LED J26 Serial port 1 J3 Speaker J27 Serial port 2 J4 Power supply J29 connector Parallel port J5 Power supply J30 connector VGA port J6 Chassis fan power J38 Floppy drive J7 Riser slot SL1 interface IDE interface J9 32-bit VESA local bus SL2 slot VGA feature connector J14 USER CONFIGURABLE SETTINGS Function Label Position » On board video disabled J15 Pins 1 & 2 closed On board video enabled J15 Pins 2 & 3 closed » Factory configured - do not J37 Unidentified alter » Factory configured - do not J50 Unidentified alter SIMM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 1MB (1) 256K x None None None 36 2MB (1) 256K x (1) 256K x None None 36 36 3MB (1) 256K x (1) 256K x (1) 256K x None 36 36 36 4MB (1) 1M x 36 None None None 4MB (1) 256K x (1) 256K x (1) 256K x (1) 256K x 36 36 36 36 5MB (1) 1M x 36 (1) 256K x None None 36 6MB (1) 1M x 36 (1) 256K x (1) 256K x None 36 36 7MB (1) 1M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 8MB (1) 1M x 36 (1) 1M x 36 None None 12MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 None 16MB (1) 4M x 36 None None None 16MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 17MB (1) 4M x 36 (1) 256K x None None 36 19MB (1) 4M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 20MB (1) 4M x 36 (1) 1M 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 28MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 32MB (1) 4M x 36 (1) 4M x 36 None None 33MB (1) 256K x (1) 4M x 36 (1) 4M x 36 None 36 48MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 None 52MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 1M x 36 64MB (1) 4M x 36 (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 CACHE JUMPER CONFIGURATION Size J12 J13 J16 J17 J51 128KB 2 & 3 1 & 2 2 & 3 1 & 2 1 & 2 256KB 1 & 2 2 & 3 1 & 2 2 & 3 2 & 3 Note: Pins designated should be in the closed position. VIDEO MEMORY CONFIGURATION Note: The size of the video memory is unidentified. CPU TYPE SELECTION Type J24 J25 J31 80486SX Pins 2 & 3 Pins 2 & 3 Pins 1 & 2 closed closed closed 80487SX Pins 1 & 2 Pins 1 & 2 Pins 2 & 3 closed closed closed 80486DX Pins 2 & 3 Pins 1 & 2 Pins 2 & 3 closed closed closed 80486DX2 Pins 2 & 3 Pins 1 & 2 Pins 2 & 3 closed closed closed ODP486 Pins 1 & 2 Pins 1 & 2 Pins 2 & 3 closed closed closed