diff --git a/Source/HBIOS/sd.asm b/Source/HBIOS/sd.asm
index 70ee71d9..dc112bb6 100644
--- a/Source/HBIOS/sd.asm
+++ b/Source/HBIOS/sd.asm
@@ -1605,6 +1605,10 @@ SD_CHKWP:
 ; SELECT CARD
 ;
 SD_SELECT:
+#IF ((SDMODE == SDMODE_CSIO) | (SDMODE == SDMODE_MK4) | (SDMODE == SDMODE_SC))
+	CALL	SD_WAITTX
+#ENDIF
+;
 	LD	A,(IY+SD_DEV)		; GET CURRENT DEVICE
 	OR	A			; SET FLAGS
 	LD	A,(SD_OPRVAL)		; GET CURRENT OPRVAL BACK