diff --git a/constants/SP2000.inc b/constants/SP2000.inc
index c7e0291..5c3eca6 100644
--- a/constants/SP2000.inc
+++ b/constants/SP2000.inc
@@ -2079,11 +2079,11 @@ SIO:
 .Ch_B.Ctrl		EQU #1B				; Control register	mouse		CMOUSE
 ; Parallel  I/O
 PIO:
-.Port_A.Data		EQU #1C				; Data register				LPT 1
-.Port_A.Command		EQU #1D				; Command register			LPT 1
-.Port_B.Data		EQU #1E				; Data register				LPT 2
+.Port_A.Data		EQU #1C				; Data register		LPT1_D		LPT 1
+.Port_A.Command		EQU #1D				; Command register	LPT1_C		LPT 1
+.Port_B.Data		EQU #1E				; Data register		LPT2_D		LPT 2
 ;только через регистр BC, иначе Альтера перехватит
-.Port_B.Command		EQU #1F				; Command register			LPT 2
+.Port_B.Command		EQU #1F				; Command register	LPT2_C		LPT 2
 ; Watch Dog timer
 WDT:
 .Master_Reg		EQU #F0				; Master register			WDTMR