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 Memory  | 
 64MB  | 
| 
 Maximum Video Memory  | 
 Unidentified  | 
| 
 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  | 
| 
 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 alter (password bypass)  | 
 SP103  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 U53  | 
 Unidentified  | 
| 
 SIMM CONFIGURATION  | ||||
| 
 Size  | 
 Bank 0  | 
 Bank 1  | 
 Bank 2  | 
 Bank 3  | 
| 
 1MB  | 
 (1) 256K x 36  | 
 None  | 
 None  | 
 None  | 
| 
 2MB  | 
 (1) 256K x 36  | 
 (1) 256K x 36  | 
 None  | 
 None  | 
| 
 3MB  | 
 (1) 256K x 36  | 
 (1) 256K x 36  | 
 (1) 256K x 36  | 
 None  | 
| 
 4MB  | 
 (1) 1M x 36  | 
 None  | 
 None  | 
 None  | 
| 
 4MB  | 
 (1) 256K x 36  | 
 (1) 256K x 36  | 
 (1) 256K x 36  | 
 (1) 256K x 36  | 
| 
 5MB  | 
 (1) 1M x 36  | 
 (1) 256K x 36  | 
 None  | 
 None  | 
| 
 6MB  | 
 (1) 1M x 36  | 
 (1) 256K x 36  | 
 (1) 256K x 36  | 
 None  | 
| 
 7MB  | 
 (1) 1M x 36  | 
 (1) 256K x 36  | 
 (1) 256K x 36  | 
 (1) 256K x 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 36  | 
 None  | 
 None  | 
| 
 19MB  | 
 (1) 4M x 36  | 
 (1) 256K x 36  | 
 (1) 256K x 36  | 
 (1) 256K x 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 36  | 
 (1) 4M x 36  | 
 (1) 4M x 36  | 
 None  | 
| 
 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 closed  | 
 Pins 1 & 2 closed  | 
 Pins 1 & 2 closed  | 
| 
 486SX/80487SX  | 
 Pins 1 & 2 closed  | 
 Pins 1 & 2 closed  | 
 Pins 2 & 3 closed  | 
| 
 486SX/ODP486  | 
 Pins 1 & 2 closed  | 
 Pins 1 & 2 closed  | 
 Pins 2 & 3 closed  | 
| 
 486SX/Pentium ODP  | 
 Pins 1 & 2 closed  | 
 Pins 1 & 2 closed  | 
 Pins 2 & 3 closed  | 
| 
 CPU TYPE SELECTION (DX, DX2 SYSTEM BOARDS)  | |||
| 
 Type  | 
 J23  | 
 J24  | 
 J25  | 
| 
 80486DX  | 
 Pins 1 & 2 closed  | 
 Pins 1 & 2 closed  | 
 Pins 1 & 2 closed  | 
| 
 80486DX2  | 
 Pins 1 & 2 closed  | 
 Pins 1 & 2 closed  | 
 Pins 1 & 2 closed  | 
| 
 Pentium ODP  | 
 Pins 1 & 2 closed  | 
 Pins 1 & 2 closed  | 
 Pins 2 & 3 closed  |