Set FDD cur_rate to 30000000, by @kitune-san

Improved stability at 14.318MHz

PCXT.sv

@@ -774,7 +774,7 @@ end
 //////////////////////////////////////////////////////////////////
 
     reg [27:0] cur_rate;
-    always @(posedge CLK_50M) cur_rate <= 50000000;
+    always @(posedge CLK_50M) cur_rate <= 30000000;
 
 	wire [5:0] r, g, b;	
 	reg [7:0] raux_cga, gaux_cga, baux_cga;