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52 lines
909 B
ArmAsm
52 lines
909 B
ArmAsm
;
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; Christian Groessler, October 2000
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;
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; this file provides the _dio_chs_to_snum function
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;
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; on the Atari this function is a dummy, it ignores
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; cylinder and head 0 and returns as sector number the
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; sector number it got
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;
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; _sectnum_t __fastcall__ _dio_chs_to_snum(_dhandle_t handle,
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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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; _dhandle_t - 16bit (ptr)
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; _sectnum_t - 16bit
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;
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.export __dio_chs_to_snum
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.import addsp4,popax
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.importzp ptr1
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.include "atari.inc"
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.proc __dio_chs_to_snum
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pha ; save sector value
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txa
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pha
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jsr addsp4 ; ignore other parameters
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jsr popax
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sta ptr1
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stx ptr1+1
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ldy #sst_flag
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lda (ptr1),y
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and #128
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beq _inv_hand ; handle not open or invalid
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pla
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tay
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pla
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rts
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_inv_hand:
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pla
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pla
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ldx #255
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txa
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rts
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.endproc
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