more I/O work in BASIC

c64/basic/basic_commands_CC/cmd_bsave.s

@@ -5,4 +5,53 @@
 
 cmd_bsave:
 
-	jmp do_NOT_IMPLEMENTED_error // XXX implement the command
+	// Set default device and secondary address
+
+	jsr helper_load_init_params_no_VERCKB
+
+	// Fetch the file name
+
+	jsr helper_load_fetch_filename
+	bcs_16 do_MISSING_FILENAME_error
+
+	// Fetch device number
+
+	jsr injest_comma
+	bcs_16 do_SYNTAX_error
+	jsr helper_load_fetch_devnum
+	bcs_16 do_SYNTAX_error
+
+	// Fetch memory area start address
+
+	jsr injest_comma
+	bcs_16 do_SYNTAX_error
+
+	jsr basic_parse_line_number                  // XXX detect errors here
+
+	lda LINNUM+0
+	pha
+	lda LINNUM+1
+	pha
+
+	// Fetch memory area end address
+
+	jsr injest_comma
+	bcs_16 do_SYNTAX_error
+
+	jsr basic_parse_line_number                  // XXX detect errors here
+
+	// Setup start/end addresses
+
+	ldx LINNUM+0
+	ldy LINNUM+1
+
+	pla
+	sta LINNUM+1
+	pla
+	sta LINNUM+0
+
+	lda #LINNUM
+
+	// Perform SAVE - reuse regular command
+
+	jmp cmd_save_do

c64/basic/basic_commands_CC/cmd_merge.s

@@ -24,11 +24,8 @@ cmd_merge:
 !:
 	// Fetch device number
 
-	jsr fetch_coma_uint8
-	bcs !+
+	jsr helper_load_fetch_devnum
 
-	sta FA
-!:
 	// Perform loading - just for a different address
 
 	sec