ez80: updated to deprecate use of RST.L %18 for bank switching and direct access using 16bit i/o

Source/HBIOS/ez80instr.inc

@@ -11,8 +11,6 @@
   #DEFINE EZ80_IO	.DB 	$49, $CF
   ; RST.L $10
   #DEFINE EZ80_FN 	.DB	$49, $D7
-  ; RST.L $18
-  #DEFINE EZ80_BNKSEL 	.DB	$49, $DF
 
   #DEFINE EZ80_UTIL_VER_EXCH		XOR A \ LD B, 0 \ EZ80_FN
   #DEFINE EZ80_UTIL_SET_BUSTM 		XOR A \ LD B, 3 \ EZ80_FN

Source/HBIOS/hbios.asm

@@ -617,8 +617,18 @@ HBX_ROM:
 #IF (MEMMGR == MM_Z2)
 
 #IF (CPUFAM == CPU_EZ80)
-	EZ80_BNKSEL
-	RET
+	BIT	7,A			; BIT 7 SET REQUESTS RAM PAGE
+	JR	Z,HBX_ROM		; NOT SET, SELECT ROM PAGE
+	RES	7,A			; RAM PAGE REQUESTED: CLEAR ROM BIT
+	ADD	A,16			; ADD 16 x 32K - RAM STARTS FROM 512K
+;
+HBX_ROM:
+	RLCA				; TIMES 2 - GET 16K PAGE INSTEAD OF 32K
+	OUT_NN_A(MPGSEL_0)		; BANK_0: 0K - 16K
+	INC	A			;
+	OUT_NN_A(MPGSEL_1)		; BANK_1: 16K - 32K
+	RET				; DONE
+
 #ELSE
 
 	BIT	7,A			; BIT 7 SET REQUESTS RAM PAGE