| Bits | Description |
|---|
| 7 | 1 if DELETE pressed |
| 6 | 1 if EDIT pressed |
| 5 | 1 if BREAK pressed |
| 4 | 1 if INV VIDEO pressed |
| 3 | 1 if TRUE VIDEO pressed |
| 2 | 1 if GRAPH pressed |
| 1 | 1 if CAPS LOCK pressed |
| 0 | 1 if EXTEND pressed |
Nextreg 0x68 bit 4 stops extended keys from making entries in the 8x5 matrix