Global Initialization of Z180 CSIO

Initialize CSIO speed at system startup.  A constant called Z180_CNTR_DEF has been created to hold the default value.  This value can be used by drivers to restore the default value after modification.

Source/HBIOS/std.asm

@@ -543,6 +543,14 @@ INT_PIO1B	.EQU	12	; ZILOG PIO 1, CHANNEL B
 #DEFINE VEC(INTX) INTX*2
 
 #ENDIF
+
+; SET DEFAULT CSIO SPEED (INTERNAL CLOCK, SLOW AS POSSIBLE)
+; DIV 1280, 14KHZ @ 18MHZ CLK
+
+#IF (CPUFAM == CPU_Z180)
+Z180_CNTR_DEF	.EQU	$06	; DEFAULT VALUE FOR Z180 CSIO CONFIG
+#ENDIF
+
 ;
 ; HELPER MACROS
 ;