- Use ProDOS 8 unit number as parameter.

- Don't access the drive, just check its presence.

git-svn-id: svn://svn.cc65.org/cc65/trunk@4723 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/apple2/dioopen.s

@@ -3,55 +3,33 @@
 ;
 ; dhandle_t __fastcall__ dio_open (driveid_t drive_id);
 ;
-; drive_id = (slot * 2) + (drive - 1)
 
         .export 	_dio_open
-        .import		return0
+        .import 	return0, __dos_type
 
-        .include	"zeropage.inc"
         .include	"errno.inc"
         .include	"mli.inc"
 
 _dio_open:
-        ; Convert drive id into unit number
+        ; Check for ProDOS 8
-        lsr
+        ldx	__dos_type
-        bcc	:+
+        bne	:+
-        ora	#%00001000
+        lda	#$01		; "Bad system call number"
-:       asl
+        bne	oserr		; Branch always
-        asl
-        asl
-        asl
-        tay			; Save handle
 
-        ; Set handle
+        ; Walk device list
-        sta	mliparam + MLI::ON_LINE::UNIT_NUM
+:       ldx	DEVCNT
-
+:       cmp	DEVLST,x
-        ; Alloc 16-byte buffer just below stack
+        beq	:+		; Found drive_id in device list
-        lda	sp
+        dex
-        sec
+        bpl	:-
-        sbc	#16
+        lda	#$28		; "No device connected"
-        sta	mliparam + MLI::ON_LINE::DATA_BUFFER
+        
-        lda	sp+1
+        ; Return oserror
-        sbc	#$00
+oserr:  sta	__oserror
-        sta	mliparam + MLI::ON_LINE::DATA_BUFFER+1
+        jmp	return0
-
-        ; Get device state
-        lda	#ON_LINE_CALL
-        ldx	#ON_LINE_COUNT
-        jsr	callmli
-        bcc	:+
-
-        ; DIO level access doesn't necessarily need a
-        ; ProDOS 8 disk so ignore "high level" errors
-        cmp	#$40
-        bcc	oserr
 
         ; Return success
-:       tya			; Restore handle
+:       ldx	#$00
-        ldx	#$00
         stx	__oserror
         rts
-
-        ; Return oserror
-oserr:  sta     __oserror
-        jmp	return0