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collapseos
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Mirror of CollapseOS
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collapseos/kernel/zxspectrum/kbd.asm

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  1. ; the ZX Spectrum BASIC firmware scans the keyboard for ASCII codes on clock interrupts

  2. ; this routine just waits for a key and reads its value

  3. 

  4. k_getc:

  5. ;ei

  6. push hl

  7. ld hl, 23611 ; ZXS_FLAGS

  8. res 5, (hl)

  9. .loop:

  10. bit 5, (hl) ; pressed?

  11. jr z, .loop

  12. ld hl, 23560 ; ZXS_LASTK

  13. ld a, (hl)

  14. pop hl

  15. ret