diff --git a/scripts/pda.pl b/scripts/pda.pl
new file mode 100755
index 0000000..4d2464f
--- /dev/null
+++ b/scripts/pda.pl
@@ -0,0 +1,167 @@
+#!/usr/bin/perl
+
+use Getopt::Long;
+GetOptions(qw(pda! diff! repl! xdiff=s));
+
+sub usage {
+  print(q{
+Usage:
+pda.pl pdafile 
+or
+pda.pl --pda --diff --xdiff=0x0104,0x0007 pda1 pda2 > diff-pda1-pda2.pda
+
+--diff     takes 2 filenams and prints a diff (2nd file will override the first on
+           records that are present in both
+--pda      saves output suitable for loading via prism2dl (mainly for --diff)
+--repl     generates merged PDA, that could be used as a replacement (prism2dl -p)
+--xdiff    exclude given PDR's from beeing overridden by dst PDA => those will be
+           generated from src pdafile (comma separated hexlist)
+});
+  exit(0);
+} 
+
+$pdr_codes = {
+	0x0001 => 'PCB_PARTNUM', 0x0002 => 'PCB_TRACENUM', 0x0003 => 'NIC_SERIAL',
+	0x0004 => 'MKK_MEASUREMENTS', 0x0005 => 'NIC_RAMSIZE', 0x0006 => 'MFISUPRANGE',
+	0x0007 => 'CFISUPRANGE', 0x0008 => 'NICID', 0x0010 => 'REFDAC_MEASUREMENTS',
+	0x0020 => 'VGDAC_MEASUREMENTS', 0x0030 => 'LEVEL_COMP_MEASUREMENTS',
+	0x0040 => 'MODEM_TRIMDAC_MEASUREMENTS', 0x0101 => 'MAC_ADDRESS', 0x0102 => 'MKK_CALLNAME',
+	0x0103 => 'REGDOMAIN', 0x0104 => 'ALLOWED_CHANNEL', 0x0105 => 'DEFAULT_CHANNEL',
+	0x0106 => 'PRIVACY_OPTION', 0x0107 => 'TEMPTYPE', 0x0110 => 'REFDAC_SETUP',
+	0x0120 => 'VGDAC_SETUP', 0x0130 => 'LEVEL_COMP_SETUP', 0x0140 => 'TRIMDAC_SETUP',
+	0x0200 => 'IFR_SETTING', 0x0201 => 'RFR_SETTING', 0x0202 => 'HFA3861_BASELINE',
+	0x0203 => 'HFA3861_SHADOW', 0x0204 => 'HFA3861_IFRF', 0x0300 => 'HFA3861_CHCALSP',
+	0x0301 => 'HFA3861_CHCALI', 0x0900 => 'HFA3861_MANF_TESTSP', 0x0901 => 'HFA3861_MANF_TESTI',
+	0x0000 => 'END_OF_PDA',
+};
+
+$pdr_fmt = {
+   0x0001 => \&x2ascii_list, 0x0002 => \&x2ascii_list, 0x0003 => \&x2ascii_list,
+   0x0101 => \&x2hex_list,   0x0103 => \&x2dec_list,   0x0104 => \&x2bit_list,
+   0x0001 => \&x2ascii_list,
+};
+
+$srcfile=$ARGV[0];
+$dstfile=$ARGV[1];
+
+if (defined $opt_xdiff) {
+  @xdiff = map {hex} split /\s*,\s*/, $opt_xdiff;
+  print "@@ xdiff: $opt_xdiff\n";
+}
+
+if (!defined $srcfile) {
+  usage();
+}
+$src=read_pda($srcfile);
+
+if ($opt_diff) {
+  if (!defined $dstfile) {
+    usage();
+  }
+  $dst=read_pda($dstfile);
+
+  map { $join{$_->{code}} = 1; $src{$_->{code}} = $_; } @$src;
+  map { $join{$_->{code}} = 1; $dst{$_->{code}} = $_; } @$dst;
+
+  for $code (sort {($a || $a+0x1000) <=> ($b || $b+0x1000)} keys %join) {
+    if (!defined $dst{$code}) {
+       push @{$diff{src}}, $src{$code};
+    } elsif (!defined $src{$code}) {
+       push @{$diff{dst}}, $dst{$code};
+    } elsif ($src{$code}{data} ne $dst{$code}{data}) {
+       push @{$diff{diff}}, [$src{$code}, $dst{$code}];
+    } else {
+       push @{$diff{same}}, [$src{$code}, $dst{$code}];
+    }
+  }
+  print "@@ Only in $srcfile:\n";
+  for my $pdr (@{$diff{src}}) {
+    print_pdr($pdr, {prefix=>$opt_pda && !$opt_repl ? "#- " : ""});
+  }
+  print "@@ Only in $dstfile:\n";
+  for my $pdr (@{$diff{dst}}) {
+    print_pdr($pdr);
+  }
+  print "@@ Different:\n";
+  for my $pdr (@{$diff{diff}}) {
+    if (grep {$_ == $pdr->[0]{code}} @xdiff) {
+      print_pdr($pdr->[0]);
+    } else {
+      if ($opt_pda && !$opt_repl && $pdr->[0]{len} != $pdr->[1]{len}) {
+	  printf "0x%04x, 0x%04x,\n", 1, $pdr->[0]{code};
+      }
+      print_pdr($pdr->[0], {prefix=>($opt_pda ? "#" : "").'- '});
+      print_pdr($pdr->[1], {prefix=>($opt_pda ? "" : "+ ")});
+    }
+  }
+  print "@@ Same:\n";
+  for my $pdr (@{$diff{same}}) {
+    print_pdr($pdr->[0], {header=>!$opt_pda});
+  }
+} else {
+  for $pdr (sort {($a->{code} || $a->{code}+0x1000) <=> ($b->{code} || $b->{code}+0x1000)} @$src) {
+    print_pdr($pdr);
+  }
+}
+sub x2ascii_list {
+  my ($pdr) = @_;
+  my ($data) =  $pdr->{data};
+  $data =~ s/[\x0-\x1f\x80-\x9f]/sprintf "\\x%02x", $&/eg;
+  return $data;
+}
+
+sub x2hex_list {
+  my ($pdr) = @_;
+
+  return join(':', map { sprintf "%02x", ord($_) } split //, $pdr->{data});
+}
+sub x2dec_list {
+  my ($pdr) = @_;
+
+  return join(',', unpack('C*', $pdr->{data}));
+}
+sub x2bit_list {
+  my ($pdr) = @_;
+  my ($start) = 1;
+
+  return join(',', map { $_ ? $start++ : scalar($start++, undef) } 
+                       split //, unpack("b*", $pdr->{data}));
+}
+
+sub print_pdr {
+  my ($pdr, $opts) = @_;
+  my $data;
+
+  if (exists($pdr_fmt->{$pdr->{code}})) {
+     $data = &{$pdr_fmt->{$pdr->{code}}}($pdr);
+  }
+  printf "%s# %s (0x%04x/0x%04x) %s\n", $opts->{prefix},
+	 $pdr_codes->{$pdr->{code}}, $pdr->{code}, $pdr->{len}, $data && "= $data"; 
+  print $opts->{prefix}.join('', map {sprintf "0x%04x, ", $_} $pdr->{len}, $pdr->{code}, @{$pdr->{nums}})."\n"
+    unless $opts->{header};
+}
+
+sub read_pda {
+  my ($file) = @_;
+  my (@pda, $pdrs);
+
+  open PDA, "$file" or die "$file: $!\n";
+  while (<PDA>) {
+    s/[^\s\da-fx,].*//;
+    push @pda, grep { /^0x[\da-z]+$/i } split /[^x\da-z]+/i;
+  }
+  close PDA;
+
+  my ($len, $op, @data);
+
+  for (my $i=0; $i < @pda; $i+=$len+1) {
+    $len   = hex($pda[$i]);
+    $code  = hex($pda[$i+1]);
+    next unless $code;
+    $nums  = [ map { hex } @pda[$i+2 .. $i+$len] ];
+    $data  = pack("v*", @$nums);
+
+    push @$pdrs, {len=>$len, code=>$code, data=>$data, nums=>$nums};
+  }
+  return $pdrs;
+}