Extended Keys 1 Register
From SpecNext official Wiki
| Number | $B1 |
|---|---|
| Readable | Yes |
| Writable | No |
| Short Description | Read Next keyboard compound keys separately |
Available since core3.1.5.
| Bit | 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 |
ULA Control Register ($68) (104) bit 4 stops extended keys from making entries in the 8x5 matrix