#!/usr/bin/perl -w

use bytes;

# dump rom as 4-color bitmap, each byte is 4 pixels wide
$/ = \1;
$addr = 0x8000;
#@chars = (" ", "X", "o", ".");
@chars = ("\x1b[30;40m ", "\x1b[30;42m ", "\x1b[30;41m ", "\x1b[30;47m ");

$start = hex(shift) || 0x950a;
$end = hex(shift) || 0x9641;
@ARGV="defender.rom" unless @ARGV;

my $pos = 0;
my $count = 0;
while(<>) {
	my $str = "";
	my @pairs;
	my $byte = ord($_);
	my $tmp = $byte;
	for(my $i = 0; $i < 4; $i++) {
		my $pixel = $tmp & 3;
		$str = $chars[$pixel] . $str;
		$str = $chars[$pixel] . $str;
		$tmp >>= 2;
	}
	$str .= "\x1b[0m";
	if($addr >= $start && $addr <= $end) {
		printf "%04x: %02x   |%s|\n", $addr, $byte, $str;
		$count++;
		print ("\n"), $count = 0 if $count == 8;
	}
	$addr++;
}