Ok, here's how I would do it the other way: Make a lookup table of the translations (since it's not straightforward base conversion): 
$_="MO\x81B\x8dCAJ\xa3";
my $start = 0x80;
my %xlate = map { my $first = $_;
                  map {(chr($start++), "$first$_")} (0..9, '.')
                } (0..9,'.') ;
s/([\x80-\xec])/$xlate{$1}/g;
print;

[download]
The compound map builds the translation table.
Caution: Contents may have been coded under pressure.

In reply to Re^3: Translating non-printable ascii by Roy Johnson
in thread Translating non-printable ascii by samurai

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