GreekIslandGirl wrote:If they are 90% similar then they are dialects derived/co-evolved from the same language.
All the Greek dialects evolved from the oldest Indo-European surviving language, termed "Hellenic".
(Or, art thou going to tell us Shakespeare penned in German, forsooth?)
No that is not correct as they did not Co-evolve and no Shakespeare did not write in German.
With Shakespeare one can read the words of the bard and apply the modern sounds of the English language and one gets something comprehensible: that does not happen with Linear A and B.
A better parallel would be the modification of the Greek Alphabet to the Russian Cyrillic Script or the difference between French and English, which share an alphabet, or EG the related Greek and Hebrew Alphabets.
Now as a syllabic script Linear A represented groups of sound syllables in Minoan: Linear B represents sounds in the Greek of the time. Now Greek dialects may well all descend from one branch of the IE language tree but the Eteo-Cretan Minoan language was from another branch of the IE language family and was not a Greek Dialect.
This is illustrated by the fact we know from the work of Ventris etc what the sounds represent in Linear B and a student of Linear B can read the words of Linear B and you get Greek but taking the same symbols when one takes the sounds represented by liner B symbols and applies them to the similar looking linear A symbols we know what the words sound like but they do not resemble spoken Greek. As far as I know it is not possible to translate Linear A s even by assigning new sounds to the elements of the script, in a fashion that would allow a translation into Greek.
The logical explanation they are different languages (why otherwise would symbols for sounds in the same language otherwise be used in such a different way ?):
In that respect Linear B only emerged after the takeover of Crete by the Mycenaeans: before then the Mycenaeans had no (known) written language. With the collapse of the Minoan palace society (and where as a script Linear A reflected the spoken language of the Minoan Rulers and was used by palace Scribes to keep transactional records) Linear A fell into disuse and was supplanted by Linear B, which used the same symbols, but which reflected the spoken language of the new Mycenaean rulers, where the sounds were used in different ways as spoken language was different. The 10% difference in symbols is likely attributable to the different sounds that may exist in one spoken language but not the other.