GeneveOS XOP Definitions
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General usage of XOPs
XOP five: Keyboard
| Input | R0 LSB | Scan mode |
| Output | R0 LSB | Scan mode |
| R1 MSB | Scan code | |
| R2 MSB | Joystick Y value (see TI, 8376) | |
| R2 LSB | Joystick X value (see TI, 8377) | |
| EQ bit | if a new key has been pressed |
The scan modes 0-5 are identical to those in the TI console. Scan mode 7 is specifically used to check the BREAK key (EQ set), and scan mode 8 returns the raw scan code in R1 MSB. If no key was pressed, R1 MSB contains 0xFF.