Presario 2100 System Board

| 2100: External Connectors | ||
| Function | Description | Designator | 
| Microphone | Mini-Jack | MIC | 
| Speaker Out/Headphone | Mini-Jack | CN2 | 
| Parallel | DSUB 25-Pin | CN3 | 
| Serial | DSUB 9-Pin | CN4 | 
| Joystick | DSUB 15-Pin 2 Row | CN5 | 
| Video | DSUB 15-Pin 3 Row | CN6 | 
| Mouse | Miniature 6-Pin | CN8 | 
| Keyboard | Miniature 6-Pin | CN9 | 
| 2100: Internal Connectors | ||
| Function | Description | Designator | 
| Modem Connector | 64-Pin Edge | SL 1 | 
| CMOS | 3-Pin Header | CMOS CLEAR | 
| SIMM Sockets | 72-Pin SIMM | SIM 1, SIM2, SIM3, SIM4 | 
| Button/Light Board | 7-Pin Header | CN7 | 
| CD Audio | 4-Pin Header | CD IN | 
| Power Supply | 6-Pin ATPWR Header | CN1 | 
| Primary IDE Drive (CD/Hard Drive) | 40-Pin Header, Key 20 | Primary IDE | 
| Diskette Drive | 34-Pin Header, Key 3 | FLOPPY |