IBM CORPORATION PS/1 TYPE 2133A, 2155A, 2168A (TYPE 1) Device Type Mainboard Processor 80486SX/80487SX/80486DX/80486DX2/P24T 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 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 VGA feature connector J14 Serial port 1 J3 IDE interface LED J26 Serial port 2 J4 Speaker J27 Parallel port J5 Power supply connector J29 VGA port J6 Power supply connector J30 Floppy drive interface J7 Riser slot SL1 IDE interface J9 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 SP103 Unidentified alter (password bypass) » Factory configured - do not U53 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 J16 J17 128KB Pins 1 & 2 closed Pins 1 & 2 closed 256KB Pins 2 & 3 closed Pins 2 & 3 closed VIDEO MEMORY CONFIGURATION Note: The size and location of the video memory is unidentified. CPU TYPE SELECTION (SX SYSTEM BOARDS) Type J23 J24 J25 80486SX Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed 486SX/80487SX Pins 1 & 2 Pins 1 & 2 Pins 2 & 3 closed closed closed 486SX/ODP486 Pins 1 & 2 Pins 1 & 2 Pins 2 & 3 closed closed closed 486SX/Pentium ODP Pins 1 & 2 Pins 1 & 2 Pins 2 & 3 closed closed closed CPU TYPE SELECTION (DX, DX2 SYSTEM BOARDS) Type J23 J24 J25 80486DX Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed 80486DX2 Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed Pentium ODP Pins 1 & 2 Pins 1 & 2 Pins 2 & 3 closed closed closed