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40 lines
705 B
40 lines
705 B
2 years ago
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; Interrupt handler for the vertical blanking
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int_vblank:
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push af
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ld a, 1
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ld [vblank_flag], a
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pop af
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reti
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; Interrupt handler for the timer
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;
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; Getting random numbers is hard, here we read the vertical position of the scanline,
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; save them periodically and use them to get something.
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int_timer:
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push hl
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push af
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push de
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; get the current random number
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ld hl, random_number
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ld a, [hl]
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ld d, a
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; get the current y position of the screen
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ld hl, LCD_POSITION_REGISTER
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ld a, [hl]
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; save the new number
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ld hl, random_number
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ld [hl+], a
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ld a, d
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ld [hl], a
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pop de
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pop af
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pop hl
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reti
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