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81 lines
1.4 KiB
ArmAsm
81 lines
1.4 KiB
ArmAsm
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; Freddy Offenga & Christian Groessler, August 2003
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;
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; function to get default device: char *getdefdev(void);
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;
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; SpartaDOS:
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; the ZCRNAME routine is only used to get the default drive because
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; ZCRNAME has two disadvantages:
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; 1. It will convert D: into D1: instead of Dn: (n = default drive)
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; 2. It will give a 'no arguments' status if it detects something
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; like Dn: (without filename).
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;
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; OS/A+ DOS:
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; ZCRNAME is slightly different from SpartaDOS. It will convert D:
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; into Dn: where n is the default drive.
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.include "atari.inc"
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.import __dos_type
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.export _getdefdev ; get default device (e.g. "D1:")
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; Get default device (LBUF will be destroyed!!)
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_getdefdev:
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lda __dos_type ; which DOS?
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cmp #ATARIDOS
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beq finish
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ldy #BUFOFF
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lda #0
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sta (DOSVEC),y ; reset buffer offset
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; Store dummy argument
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ldy #LBUF
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lda #'X'
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sta (DOSVEC),y
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iny
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lda #ATEOL
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sta (DOSVEC),y
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; One extra store to avoid the buggy sequence from OS/A+ DOS:
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; <D><RETURN><:> => drive number = <RETURN>
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iny
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sta (DOSVEC),y
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; Create crunch vector
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ldy #ZCRNAME+1
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lda (DOSVEC),y
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sta crvec+1
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iny
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lda (DOSVEC),y
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sta crvec+2
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crvec: jsr $FFFF ; will be set to crunch vector
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; Get default device
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ldy #COMFNAM ; COMFNAM is always "Dn:"
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lda (DOSVEC),y
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sta defdev
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iny
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lda (DOSVEC),y
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sta defdev+1
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; return ointer to default device
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finish: lda #<defdev
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ldx #>defdev
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rts
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.data
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; Default device
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defdev:
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.byte "D1:", 0
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