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7804: Clear screen and enter setup menu.
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Saves stack pointer, clears screen with white-on-black attributes, then jumps to setup routine.
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| clear_and_setup | 7804 | LD ($7810),SP | Save current stack pointer to setup_sp. | |
| 7808 | LD D,$07 | Clear screen with white-on-black attributes. | ||
| 780A | CALL clear_screen | |||
| 780D | JP setup | Continue with setup. | ||
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