Memory, Hyperlexia and Calendar Calculation have been known for awhile.
From the friendly DSM:
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Sometimes special skills are present (e.g., a 4 1/2 year old girl with Autistic Disorder may be able to "decode" written materials with minimal understanding of the meaning of what is read [hyperlexia] or a 10 year old boy may have prodigious abilities to calculate dates [calendar calculation]).
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In older individuals, tasks involving long-term memory (e.g., train timetables, historical dates, chemical formulas, or recalling the exact words of songs heard years before) may be excellent, but the information tends to be repeated over and over again, regardless of the appropriateness of the information to the social context.
Asperger's and its rote-memory:
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Variability of cognitive functioning may be observed, often with strengths in areas of verbal ability (e.g., vocabulary, rote auditory memory) and weaknesses in non-verbal areas (e.g., visual-motor and visual-spatial skills).
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By adolescence some individuals with the disorder may learn to use areas of strength (e.g., rote verbal abilities) to compensate for areas of weakness.