diff --git a/sources/DSS/dss_error.asm b/sources/DSS/dss_error.asm
index 776b49a..5189dfa 100644
--- a/sources/DSS/dss_error.asm
+++ b/sources/DSS/dss_error.asm
@@ -23,7 +23,7 @@ EPRINT
 	DSS_EXEC	DSS_PCHARS
 	LD		HL, WCOMMON.LINE_END
     DSS_EXEC	DSS_PCHARS
-	POP 	BC											; clear add from stack
+	POP 	BC											; clear addr from stack
 	DSS_EXEC	0x0200+DSS_EXIT							; and exit
 
 ; ------------------------------------------------------
diff --git a/sources/DSS/esplib.asm b/sources/DSS/esplib.asm
index 6ab5f7f..a45465e 100644
--- a/sources/DSS/esplib.asm
+++ b/sources/DSS/esplib.asm
@@ -513,4 +513,4 @@ RS_BUFF
 
 	ENDMODULE
 
-	END
\ No newline at end of file
+	ENDIF
\ No newline at end of file
diff --git a/sources/DSS/isa.asm b/sources/DSS/isa.asm
index b9234f7..e52111a 100644
--- a/sources/DSS/isa.asm
+++ b/sources/DSS/isa.asm
@@ -55,7 +55,7 @@ ISA_OPEN
 	LD 		A, 0x11
 	OUT 	(C), A
 ISA_SLOT	EQU $+1
-	LD		A,0x00
+	LD		A, 0x00
 	SLA		A
 	OR 		A, 0xD4										; D4 - ISA1, D6 - ISA2
 	LD		BC, PAGE3
diff --git a/sources/DSS/tftp.asm b/sources/DSS/tftp.asm
index 9dbe5ba..0bcbd97 100644
--- a/sources/DSS/tftp.asm
+++ b/sources/DSS/tftp.asm
@@ -165,9 +165,10 @@ CHK_ERROR
 .MSG_ERR_UPT
 	DB "Unknown TFTP packet received!",0
 
-; Buffer for UDP datagram with TFTP payload
+; Length of TFTP packet
 TFTF_PACKET_LEN
 	DW 0
+; Buffer for UDP datagram with TFTP payload
 TFTP_BUFF
 	DS 516,0
 
diff --git a/sources/DSS/wtftp.asm b/sources/DSS/wtftp.asm
index 20414c6..f1dfdc8 100644
--- a/sources/DSS/wtftp.asm
+++ b/sources/DSS/wtftp.asm
@@ -205,11 +205,11 @@ GET_SRV_PARAMS
 .GSNP_NXT	
 	INC		HL											
 	LD		A,(HL)
-	CP		A,'/'										; end slash
+	CP		'/'											; end slash
 	JR		Z,.GSN_EN
-	CP		A,'0'
+	CP		'0'
 	JP		M,.GSN_EPN
-	CP		A,0x3A										; >'9'?
+	CP		0x3A										; >'9'?
 	JP		P,.GSN_EPN
 	LD		(DE),A
 	INC		DE
@@ -555,4 +555,4 @@ TMP_BUFF EQU WIFI.RS_BUFF + RS_BUFF_SIZE
 
 
 
-    END MAIN.START
+    END ;MAIN.START