-fix KEYSCAN with SIO buffer and Shift

DSS/KEYINTER.ASM

@@ -459,7 +459,9 @@ KEYSCAN:
 	CALL	SHIFTS
 	RES	FLAG_E0,(IX+KEYFLG)
 	RES	FLAG_E1,(IX+KEYFLG)
-	;RET	Z		;IT'S SHIFT KEY
+	;[ ] 29/02/2024 ¢ë£à¥¡á⨠¢¥áì ¡ãä¥à
+	 JR	Z,.RESCAN	;IT'S SHIFT KEY
+	 ; RET	Z		;IT'S SHIFT KEY
 	;
 	CALL	INPCODE		;L - AT	POS. CODE
 	;PUTCODE
@@ -991,6 +993,7 @@ Receiver_Overrun:
 	; reg 0 - reset errors
 	LD	A,%0011'0000
 	OUT	(Z84.SIO.Ch_A.Ctrl),A
+	;!TODO ¯à¨ ¤¥â¥ªâ¥ ¯¥à¥¯®«­¥­¨ï ¡ãä¥à  ¯à®æ  á­ïâì ª« ¢¨è¨ ¨§ ¯®àâ  #FE ᯥªâà㬠
 	;
 	LD	(IX+K_SHIFT),0
 	LD	(IX+KEYFLG),0

DSS/build.txt

@@ -1 +1 @@
-939
+943