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}

sub _bad_inst {
    my $self = shift;
    my $pc   = $self->get_pc;

    croak sprintf( "Bad instruction at &%04x (&%02x)\n",
      $pc - 1, $self->{ mem }->[ $pc - 1 ] );
}

# Functions that generate code fragments
sub _set_nz {
  return
     '$p &= ~(N|Z);' . 'if( '
   . $_[0]
   . ' & 0x80){ $p |= N }'
   . 'elsif( '
   . $_[0]
   . ' == 0 ){ $p |= Z }';
}