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49 lines
963 B
ArmAsm
49 lines
963 B
ArmAsm
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; Oliver Schmidt, 2012-09-04
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;
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; unsigned char getfirstdevice (void);
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; unsigned char __fastcall__ getnextdevice (unsigned char device);
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;
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.export _getfirstdevice
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.export _getnextdevice
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.import __dos_type
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.include "zeropage.inc"
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.include "mli.inc"
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_getfirstdevice:
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lda #$FF
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; Fall through
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_getnextdevice:
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next: tax
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inx
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txa
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cmp #$FF
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beq done
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; Check for ProDOS 8
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ldx __dos_type
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beq next
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; Up to 14 units may be active
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ldx #<DEVLST
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ldy #>DEVLST
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stx ptr1
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sty ptr1+1
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; Number of on-line devices (minus 1)
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ldy DEVCNT
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; Does the list contain the device?
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: cmp (ptr1),y
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beq done
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dey
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bpl :-
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bmi next ; Branch always
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done: ldx #$00
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rts
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