first work towards DOS wedge

c64/basic/basic_execute_line.s

@@ -80,9 +80,9 @@ basic_execute_statement:
 	;; Now consume the character
 	jsr basic_consume_character
 	
-	rts	
+	rts
 
-not_a_token:	
+not_a_token:
 	;; Space, which we can also just ignore
 	cmp #$20
 	beq basic_skip_char
@@ -93,11 +93,27 @@ not_a_token:
 	cmp #$3a
 	beq basic_skip_char
 	
+;; START wedge support
+	
+	;; Are we in direct mode?
+	;; DOS Wedge is a hacky solution (inelegant, but convenient),
+	;; BASIC programmers should implement communication with drives
+	;; the standard way, handling channels properly
+	ldx basic_current_line_number+1
+	cpx #$ff
+	bne +
+	;; We are in direct mode, allow wedge to handle '@' sign
+	;; XXX Maybe it should be allowed only as the first command?
+	cmp #$40
+	bne +
+	jsr basic_consume_character
+	jmp wedge_dos
+*
+;; END wedge support
+
 	;; If all else fails, it's a syntax error
 	jmp do_SYNTAX_error
 
-	jmp basic_main_loop
-
 basic_skip_char:
 	jsr basic_consume_character
 	jmp basic_execute_statement

c64/basic/wedge_dos.s

@@ -0,0 +1,65 @@
+
+;; START wedge support
+
+wedge_dos:
+
+	;; Close all the channels, so that wedge has full control
+	jsr $FFE7 ; CLALL
+	
+	;; Take last device number, make sure it's a drive
+	;; If not, set to 8 (first drive number)
+	lda current_device_number
+	cmp #$07
+	bpl +
+	lda #$08	
+*
+	;; Set remaining file parameters
+	ldx #$0F
+	ldy #$0F
+	jsr $FFBA ; SETLFS
+
+	;; Now we have to check what the user wants us to do
+
+	;; Check if user asked for a status
+	ldy #$00
+	lda (basic_current_statement_ptr), y
+	beq wedge_dos_status
+	cmp #$20
+	beq wedge_dos_status
+	
+	;; Check if asked for a directory
+	cmp #$24
+	beq wedge_dos_directory
+*
+	;; XXX Check if asked to change drive number
+
+wedge_dos_command: ; default
+
+	;; XXX - implement this
+	jsr printf
+	.byte "DBG: CMD", 0
+	jmp do_NOT_IMPLEMENTED_error
+
+wedge_dos_change_drive:
+
+	;; XXX - implement this
+	jsr printf
+	.byte "DBG: CHANGE DRIVE", 0
+	jmp do_NOT_IMPLEMENTED_error
+
+wedge_dos_status:
+
+	;; XXX - implement this
+	jsr printf
+	.byte "DBG: STATUS", 0
+	jmp do_NOT_IMPLEMENTED_error
+
+wedge_dos_directory:
+
+	;; XXX - implement this
+	jsr printf
+	.byte "DBG: DIR", 0
+	jmp do_NOT_IMPLEMENTED_error
+
+;; END wedge support
+