diff --git a/constants/SP2000.inc b/constants/SP2000.inc
index 1760ea0..b7b16ed 100644
--- a/constants/SP2000.inc
+++ b/constants/SP2000.inc
@@ -482,6 +482,9 @@ SCREEN_SWITCH		EQU RGMOD
 PORT_SCALE		EQU #FC					; Порт масштабирования
 
 ;VIDEO_PAGE		EQU #50
+ZX_MEM_PORT		EQU #FD
+.Scorpion		EQU #1FFD
+.Pentagon		EQU #7FFD
 
 Port_All_Mode		EQU	#204E
 .SPECTRUM_MODE_OFF	EQU	1	; ACC on, KBD Int on, ZX Screen off