Der IBM 5103 Matrixdrucker ist der einzige Drucker, der an der IBM 51x0 (x=0, 1, 2) angeschlossen werden kann. Es gibt ihn in zwei Varianten: Einmal mit 80 Zeichen/sek. und einmal mit 120 Zeichen/sek.
| Reset | Set | Funktion | Reset | Set | Funktion |
|---|---|---|---|---|---|
| 10 | 90 | Forms go latch | 51 | D1 | Enable timer interrupts |
| 93 | Not forms motor latch A and B | 52 | Reset timer interrupt | ||
| 97 | Forms motor latch A | D4 | Enable 3.3ms or 2.66ms interrupt | ||
| 9B | Forms motor latch B | 54 | D4 | Enable print fire (5110) | |
| 9F | Forms motor latch A and B | 54 | Enable 1.1ms interrupt | ||
| 11 | 91 | Enable forms interrupt (5110) | 41 | C1 | Enable not ready interrupt |
| 12 | Reset forms interrupt (5110) | 42 | Reset not ready interrupt | ||
| 20 | A0 | Print go latch | 58 | D8 | Allow ROS addressing |
| 21 | A1 | Enable print emitter interrupts | D8 | Preset timer counter (5110) | |
| 22 | Reset print emitter interrupt | EC | ROS address byte 0 | ||
| A3 | Not print motor latches A and B | 6C | ROS address byte 1 | ||
| A7 | Print motor latch A | E4 | ROS address byte 2 | ||
| AB | Print motor latch B | 64 | ROS address byte 3 | ||
| AF | Print motor latches A and B | E8 | ROS address byte 4 | ||
| 80 | Both motors on (both go latches on) | 68 | ROS address byte 5 | ||
| 00 | Both motors off (both go latches off) | E0 | ROS address byte 6 | 60 | ROS address byte 7 |
