diff --git a/main.c b/main.c
index 19a1dcf..6fde8ce 100644
--- a/main.c
+++ b/main.c
@@ -7,9 +7,10 @@ void cmd_aIDNq_cb(const SCPI_argval_t *args);
 void cmd_APPL_SIN_cb(const SCPI_argval_t *args);
 void cmd_APPL_TRI_cb(const SCPI_argval_t *args);
 void cmd_FREQ_cb(const SCPI_argval_t *args);
+void cmd_DISP_TEXT_cb(const SCPI_argval_t *args);
 
-const uint16_t scpi_cmd_lang_len = 4;
-const SCPI_command_t scpi_cmd_lang[4] = {
+const uint16_t scpi_cmd_lang_len = 5;
+const SCPI_command_t scpi_cmd_lang[5] = {
 	{
 		.level_cnt = 1, .levels = {"*IDN?"},
 		.param_cnt = 0, .params = {},
@@ -30,6 +31,11 @@ const SCPI_command_t scpi_cmd_lang[4] = {
 		.param_cnt = 1, .params = {SCPI_DT_INT},
 		.callback = cmd_FREQ_cb
 	},
+	{
+		.level_cnt = 2, .levels = {"DISPlay", "TEXT"},
+		.param_cnt = 2, .params = {SCPI_DT_STRING, SCPI_DT_BOOL},
+		.callback = cmd_DISP_TEXT_cb
+	},
 };
 
 
@@ -53,15 +59,20 @@ void cmd_APPL_TRI_cb(const SCPI_argval_t *args)
 
 void cmd_FREQ_cb(const SCPI_argval_t *args)
 {
-	printf("cb  FREQuency\n");
+	printf("cb  FREQuency %d\n", args[0].INT);
 }
 
+void cmd_DISP_TEXT_cb(const SCPI_argval_t *args)
+{
+	printf("cb  DISPlay:TEXT %s, %d\n", args[0].STRING, args[1].BOOL);
+}
 
 
 int main()
 {
-	//const char *inp = "*IDN?\n";
-	const char *inp = "FREQ 50\n";
+//	const char *inp = "*IDN?\n";
+//	const char *inp = "FREQ 50\n";
+	const char *inp = "DISPlay:TEXT 'banana', OFF\nFUBAR moo fuck\r\nFREQ 50\r\n";
 
 	for(int i=0;i<strlen(inp); i++) {
 		scpi_handle_byte(inp[i]);
diff --git a/scpi_parser.c b/scpi_parser.c
index 196ee40..1e4c14b 100644
--- a/scpi_parser.c
+++ b/scpi_parser.c
@@ -249,7 +249,7 @@ void scpi_handle_byte(const uint8_t b)
 			}
 			break;
 
-		// TODO more states
+			// TODO more states
 	}
 }
 
@@ -272,7 +272,7 @@ static void pars_cmd_colon(void)
 	} else {
 		// internal colon - partial match
 		if (pars_match_cmd(true)) {
-			printf("OK partial cmd, last segment = %s\n", pst.cur_levels[pst.cur_level_i - 1]);
+			// ok
 		} else {
 			printf("ERROR no such command (colon).\n");//TODO error
 			pst.state = PARS_DISCARD_LINE;
@@ -322,7 +322,7 @@ static void pars_cmd_space(void)
 			pst.state = PARS_ARG;
 		}
 	} else {
-		printf("ERROR no such command (space) %s.\n", pst.charbuf);//TODO error
+		printf("ERROR no such command: %s.\n", pst.charbuf);//TODO error
 		pst.state = PARS_DISCARD_LINE;
 	}
 }
@@ -485,8 +485,8 @@ static void pars_arg_char(char c)
 			break;
 
 		case SCPI_DT_INT:
-			if (!IS_FLOAT_CHAR(c)) {
-				printf("ERROR unexpected char '%d' in int.\n", c);//TODO error
+			if (!IS_INT_CHAR(c)) {
+				printf("ERROR unexpected char '%c' in int.\n", c);//TODO error
 				pst.state = PARS_DISCARD_LINE;
 			} else {
 				charbuf_append(c);
@@ -511,6 +511,12 @@ static void pars_arg_comma(void)
 		return;
 	}
 
+	if (pst.charbuf_i == 0) {
+		printf("ERROR empty argument is not allowed.\n");//TODO error
+		pst.state = PARS_DISCARD_LINE;
+		return;
+	}
+
 	// Convert to the right type
 
 	arg_convert_value();
@@ -567,6 +573,7 @@ static void arg_convert_value(void)
 
 		case SCPI_DT_INT:
 			j = sscanf(pst.charbuf, "%d", &dest->INT);
+
 			if (j == 0) {
 				printf("ERROR failed to convert %s to INT\n", pst.charbuf);//TODO error
 				pst.state = PARS_DISCARD_LINE;