Difference between revisions of "ULA Control Port"
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| − | 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
| Number | $xxFE |
|---|---|
| Decimal | |
| Short desc. | Controls border color and base Spectrum audio settings. |
| Bit Mask | %---- ---- ---- ---0 |
| Readable | No |
| Writable | Yes |
| Subsystem |
When written to, adjusts the border color and audio devices as follows:
| Bit | Function |
|---|---|
| 0-2 | Border color |
| 3 | Enable MIC output |
| 4 | Enable EAR output |
| 5-7 | Unused |
Reading the port with certain particular high bytes will read the keyboard (see Keyboard ($**FE / 254). Bit 6 of the ULA byte is always the EAR input.