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35 lines
683 B
ArmAsm
35 lines
683 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, isdevice
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.include "zeropage.inc"
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_getfirstdevice:
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lda #$FF
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; Fall through
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_getnextdevice:
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tax
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next: inx
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cpx #$FF ; INVALID_DEVICE
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beq done
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; Check for ProDOS 8
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lda __dos_type
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beq next
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; Check for valid device
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jsr isdevice
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bne next
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done: txa
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ldx #$00
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rts
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