diff --git a/tornado/fw/txt/plot b/tornado/fw/txt/plot
new file mode 100755
index 0000000..e295501
--- /dev/null
+++ b/tornado/fw/txt/plot
@@ -0,0 +1,10 @@
+#!/bin/sh
+(
+	cat <<EOF
+#set xrange [0:255]
+#set yrange [0:63]
+set size ratio -1
+plot "-" with points pt 7 notitle
+EOF
+	cat
+) | gnuplot -persist
diff --git a/tornado/fw/txt/stretch b/tornado/fw/txt/stretch
new file mode 100755
index 0000000..3adb2d0
--- /dev/null
+++ b/tornado/fw/txt/stretch
@@ -0,0 +1,78 @@
+#!/usr/bin/perl
+
+$L = 15;	# bytes per line
+
+
+sub pick
+{
+	local ($x, $y) = @_;
+
+	my $i = $x+$y*$X;
+	return ((hex $p[$i >> 3]) >> ($i & 7)) & 1;
+}
+
+
+$f = 0.001*shift @ARGV;
+
+while (<>) {
+	if (/#define\s+(\S+)_width\s+(\d+)/) {
+		print;
+		$N = $1;
+		$X = $2;
+		next;
+	}
+	if (/#define\s+\S+_height\s+(\d+)/) {
+		print;
+		$Y = $1;
+		next;
+	}
+	chop;
+	next unless /\s*0x/;
+	s/^\s*//;
+	s/(,|};)$//;
+	push(@p, split /,/);
+}
+
+FIRST: for ($x0 = 0; $x0 != $X; $x0++) {
+	for ($y = 0; $y != $Y; $y++) {
+		last FIRST if &pick($x0, $y);
+	}
+}
+
+for ($x = $x0; $x != $X; $x++) {
+	for ($y = 0; $y != $Y; $y++) {
+		$x1 = $x if &pick($x, $y);
+	}
+}
+
+$w = ($x1-$x0)+1;
+$off = int(($X-$x1+$x0)/2);
+#print STDERR "$X $x0 $x1 $w $off\n";
+
+# x' = x*(1+y*f)
+# x'/(1+y*f) = x
+# x'
+for ($y = 0; $y != $Y; $y++) {
+	for ($x = 0; $x != $X; $x += 8) {
+		$v = 0;
+		for ($i = 0; $i != 8; $i++) {
+			$t = $x+$i-$X/2;
+			$t = int($t*(1-$y*$f)-$off+$X/2);
+			next if $t < 0 || $t >= $X;
+			$v |= 1 << $i if &pick($t, $y);
+		}
+		push(@r, sprintf("0x%02x", $v));
+	}
+}
+
+print "static char ${N}_bits[] = {\n";
+$i = 0;
+for (@r) {
+	print " " if !($i % $L);
+	print $_;
+	last if $i == $#r;
+	$i++;
+	print ",";
+	print "\n" if !($i % $L);
+}
+print "};\n";
diff --git a/tornado/fw/txt/t b/tornado/fw/txt/t
new file mode 100755
index 0000000..ec5a418
--- /dev/null
+++ b/tornado/fw/txt/t
@@ -0,0 +1,2 @@
+#!/bin/sh
+./txt2xbm TEST | ./stretch 6 | ./xbm2gp "$@" | ./plot
diff --git a/tornado/fw/txt/txt2xbm b/tornado/fw/txt/txt2xbm
new file mode 100755
index 0000000..8fce920
--- /dev/null
+++ b/tornado/fw/txt/txt2xbm
@@ -0,0 +1,9 @@
+#!/bin/sh
+gs -sDEVICE=pbmraw -sOutputFile=- -g256x64 -q - <<EOF | pbmtoxbm
+/Helvetica-Bold findfont
+80 scalefont
+setfont
+0 4 moveto
+($1) show
+showpage
+EOF
diff --git a/tornado/fw/txt/xbm2gp b/tornado/fw/txt/xbm2gp
new file mode 100755
index 0000000..f930a28
--- /dev/null
+++ b/tornado/fw/txt/xbm2gp
@@ -0,0 +1,52 @@
+#!/usr/bin/perl
+$I = 50;	# inner radius (50 cm)
+$O = 80;	# outer radius (80 cm)
+#$Y = 64;	# image heights (pixels)
+#$X = 256;	# image width (pixels)
+
+
+sub ang
+{
+	local ($r) = @_;
+
+# (O-I)/Y = r*arc(a)
+# arc 
+	return ($O-$I)/$Y/$r;
+}
+
+
+if ($ARGV[0] eq "-r") {
+	shift @ARGV;
+	$rect = 1;
+}
+
+while (<>) {
+	chop;
+	if (/#define\s+\S+_width\s+(\d+)/) {
+		$X = $1;
+		next;
+	}
+	if (/#define\s+\S+_height\s+(\d+)/) {
+		$Y = $1;
+		next;
+	}
+	next unless /\s*0x/;
+	s/^\s*//;
+	s/(,|};)$//;
+	push(@p, split /,/);
+}
+
+for ($x = 0; $x != $X; $x++) {
+	for ($y = 0; $y != $Y; $y++) {
+		$i = $x+$y*$X;
+		$p = ((hex $p[$i >> 3]) >> ($i & 7)) & 1;
+		next unless $p;
+		if ($rect) {
+			print "$x ", $Y-$y-1, "\n";
+		} else {
+			$r = ($Y-$y-1)/$Y*($O-$I)+$I;
+			$a = &ang($O)*($x-$X/2);
+			print $r*sin($a), " ", $r*cos($a), "\n";
+		}
+	}
+}