-bug with ZX flag after ZX-ROM's inited

src/bios/exp/EXP.asm

@@ -846,6 +846,7 @@ init_rom_address        EQU #8200                                       ;!HARDCO
 	LDIR								; § ¡¨âì FF- ¬¨
 
         ; áâ ¢¨¬ ¬¥âªã ¥á«¨ ¯à®£à㧨«¨ <20>‡“ ᯥªâà㬠
+	DEC DE
         LD A,'X'
         LD (DE),A
         DEC DE

src/bios/exp/FUNC_RAM_ROM_DRV.ASM

@@ -880,6 +880,7 @@ SWAP_RAM_DRIVES:
 	OUT	(SLOT3),A
 	;
 	LD	A,(SYS_PAGE.CURRENT_RAM_DRV)
+	LD	C,A
 	CP	B
 	JR	Z,.exit		; 㦥 ãáâ ­®¢«¥­ § ¯à è¨¢ ¥¬ë© ­ ¡®à
 	;
@@ -903,9 +904,11 @@ SWAP_RAM_DRIVES:
 	LD	A,(SYS_PAGE.CURRENT_RAM_DRV)
 	XOR	#FF
 	LD	(SYS_PAGE.CURRENT_RAM_DRV),A
+	LD	C,A
 	;
 .exit:	POP	AF
 	OUT	(SLOT3),A
+	LD	A,C
 	RET
 ;----------------------------------------------------------------------;
 ;