Here's one way to do it:
#!perl -w
use strict;
my @ddig;
my @spaces;
$ddig[$_ + 128] = sprintf "%02d", $_ for 0 .. 99;
$spaces[$_] = " " x $_ for 0 .. 255;


while (<DATA>) {
  s/([\x80-\xe3])/$ddig[ord($1)]/g;
  s/\xff(.)/$spaces[ord($1)]/eg;
  print;
}
__DATA__
MOBCAJ
This is atest
123456789012345678901234567890

[download]
Please note, as Roy Johnson says above, that either your specification is unclear or your arithmetic is wrong. I'm assuming that "\x00-\xe3" maps to "00" through "99". The example you gives maps to "MO01B13CAJ35" with my code, not "MO01B12CAJ32".

In reply to Re: Translating non-printable ascii by Thelonius
in thread Translating non-printable ascii by samurai

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