ULA Control Port: Difference between revisions
From SpecNext Wiki
No edit summary |
No edit summary |
||
| Line 20: | Line 20: | ||
|} | |} | ||
Reading the port with certain particular high bytes will read the keyboard (see {{ | Reading the port with certain particular high bytes will read the keyboard (see {{PortNo|$**FE}}. Bit 6 of the ULA byte is always the EAR input. | ||
Revision as of 15:53, 29 August 2017
| Port Number | $xxFE |
|---|---|
| Decimal | |
| Short desc. | Controls border color and base Spectrum audio settings. |
| Bit Mask | %---- ---- ---- ---0 |
| Readable | No |
| Writable | Yes |
| Subsystem |
When written to, adjusts the border color and audio devices as follows:
| Bit | Function |
|---|---|
| 0-2 | Border color |
| 3 | Enable MIC output |
| 4 | Enable EAR output |
| 5-7 | Unused |
Reading the port with certain particular high bytes will read the keyboard (see NextPort:$**FE. Bit 6 of the ULA byte is always the EAR input.