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53 lines
868 B
ArmAsm
53 lines
868 B
ArmAsm
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; Christian Groessler, October 2000
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;
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; this file provides the _dio_snum_to_chs function
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;
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; on the Atari this function is a dummy, it returns
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; cylinder and head 0 and as sector the sectnum it got
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;
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; void __fastcall__ _dio_snum_to_chs(_sectnum_t sect_num,
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; unsigned int *cyl,
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; unsigned int *head,
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; unsigned int *sector);
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; _sectnum_t - 16bit
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;
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.export __dio_snum_to_chs
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.include "atari.inc"
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.importzp ptr1,ptr2
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.import popax
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.proc __dio_snum_to_chs
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sta ptr1
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stx ptr1+1 ; save pointer to sector #
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jsr popax ; get pointer to head
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sta ptr2
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stx ptr2+1
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lda #0
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tay
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sta (ptr2),y ; set head number
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iny
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sta (ptr2),y
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jsr popax ; get pointer to cyl
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sta ptr2
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stx ptr2+1
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dey
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tya
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sta (ptr2),y ; set cylinder number
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iny
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sta (ptr2),y
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jsr popax ; get sector #
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dey
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sta (ptr1),y
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iny
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txa
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sta (ptr1),y
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rts
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.endproc
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