2 ; Freddy Offenga & Christian Groessler, December 2004
4 ; function to get default device: char *_getdefdev(void);
7 ; the ZCRNAME routine is only used to get the default drive because
8 ; ZCRNAME has two disadvantages:
9 ; 1. It will convert D: into D1: instead of Dn: (n = default drive)
10 ; 2. It will give a 'no arguments' status if it detects something
11 ; like Dn: (without filename).
14 ; ZCRNAME is slightly different from SpartaDOS. It will convert D:
15 ; into Dn: where n is the default drive.
19 .export __getdefdev ; get default device
20 .export __defdev ; this is the default device string (e.g. "D1:")
22 .constructor __getdefdev, 24
25 ; Get default device (LBUF will be destroyed!!)
29 lda __dos_type ; which DOS?
31 beq xdos ; only supported on XDOS ...
32 ; cmp #OSADOS+1 ; (redundant: #OSADOS+1 = #XDOS)
33 bcs finish ; ... and on OS/A+ and SpartaDOS
37 sta (DOSVEC),y ; reset buffer offset
39 ; Store dummy argument
48 ; One extra store to avoid the buggy sequence from OS/A+ DOS:
49 ; <D><RETURN><:> => drive number = <RETURN>
54 ; Create crunch vector
67 ldy #COMFNAM ; COMFNAM is always "Dn:"
74 ; Return pointer to default device
76 finish: lda #<__defdev
80 ; XDOS default device retrieval
84 ; check XDOS version (we need >= 2.4)
87 cmp #$4C ; there needs to be a 'JMP' opcode here
88 bne finish ; older version, use DEFAULT_DEVICE or D1:
89 lda XVER ; get BCD encoded version ($24 for 2.4)
91 bcc finish ; too old, below 2.4
93 ; good XDOS version, get default drive
96 sta XLINE ; simulate empty command line
98 jsr XMOVE ; create an FMS filename (which in this case only contains the drive)
104 crvec: jmp $FFFF ; target address will be set to crunch vector
106 ; Default device string
109 .ifdef DEFAULT_DEVICE
110 .byte 'D', '0'+DEFAULT_DEVICE, ':', 0