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more work on MEGA65 keyboard scanner

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FeralChild64 committed 2020-11-28 20:47:35 +01:00
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doc/Development.md
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@@ -53,9 +53,9 @@ There is no official PETSCII code for `TAB` - we can't utilize the ones from C12
`SHFLAG` (`$028D`) variable is extended to support additional bucky keys on C128 and C65 keyboards:
| bits 7-5 | bit 4 | bit 3 | bit 2 | bit 1 | bit 0 |
| :------: | :---------: | :------: | :------: | :------: | :------: |
| reserved | `CAPS LOCK` | `ALT` | `CTRL` | `VENDOR` | `SHIFT` |
| bits 7-6 | bit 5 | bit 4 | bit 3 | bit 2 | bit 1 | bit 0 |
| :------: | :-------: | :---------: | :------: | :------: | :------: | :------: |
| reserved | `NO SCRL` | `CAPS LOCK` | `ALT` | `CTRL` | `VENDOR` | `SHIFT` |
Bits 3 and 4 are extension to the original variable, compatible with the C128 ROMs API. There is no official way to retrieve `NO_SCRL` status as of yet. The `40/80` key status cannot be retrieved in C64 mode at all (C128 hardware limitation).