Starting to map out branch instructions

diff --git a/ROM/fixvendbra.pl b/ROM/fixvendbra.pl
new file mode 100644 (file)
index 0000000..88a32a9
--- /dev/null
+++ b/ROM/fixvendbra.pl
@@ -0,0 +1,65 @@
+my %commands;
+
+$commands{'bra'}=1;
+$commands{'blt'}=1;
+$commands{'bcc'}=1;
+$commands{'bcs'}=1;
+$commands{'beq'}=1;
+$commands{'bge'}=1;
+$commands{'bgt'}=1;
+$commands{'bhi'}=1;
+$commands{'bhs'}=1;
+$commands{'ble'}=1;
+$commands{'blo'}=1;
+$commands{'bls'}=1;
+$commands{'blt'}=1;
+$commands{'bmi'}=1;
+$commands{'bne'}=1;
+$commands{'bpl'}=1;
+$commands{'brn'}=1;
+$commands{'bvc'}=1;
+$commands{'bvs'}=1;
+
+sub convert {
+       ($onum) = @_;
+
+       $num = hex $onum;
+
+       if ($num & 128) {
+               $num = $num - 256;
+       }
+
+       return $num;
+
+}
+
+#printf "%X", convert("E1");
+#printf "\n";
+#printf "%X", convert("71");
+#printf "\n";
+
+
+while(<>) {    
+       chomp;
+       $l = length;
+       if ($l != 33) {
+               print "$_\n";
+               next;
+       } else {
+
+       $addr = substr($_,0,4);
+       $inst = substr($_,27,3);
+       $val = substr($_,31,2);
+
+       #print "$val\n";
+       $daddr = (hex $addr) + 2 + convert($val);
+
+       
+       if (defined $commands{$inst}) {
+               print "$_\t\t;";
+               printf "%4X", $daddr;
+               #print " $addr $inst $val\n";
+               print "\n";
+       } 
+       }
+}