Digitisation of all these kinds of Arabic-script manuscripts would be somewhat easier if the Arabic block in Unicode had more combining marks, the way the Latin and Cyrillic blocks have done for pretty much all the various tails and tildes and slash marks.
[1] e.g. http://www.jstor.org/pss/3821001 http://www.reference-global.com/doi/abs/10.1515/ijsl.2002.05...
Are you kidding me? Ethiopia alone has multiple scripts."
Ah well, when I was living in the United States people used to ask me if we all used elephants for transport in India. I used to answer "Sure, we had this big stable of elephants and I went to school on one, as did all the kids in the neighbourhood. Actually I went to the airport for my trip here on the house elephant .. "
(Fwiw, my great grandfather did own an elephant in the early 1900s but it used to haul lumber and take part in temple processions, not so much provide transport from point A to B ... )
http://en.wikipedia.org/wiki/Amharic
and Tifinagh (now taught in Morocco and Algeria) :
Unfortunately, it's a common misconception that Africa had no writing systems or math.
The official libraries struggle to even catalogue the material they have. The Ahmed Baba Institute is trying to digitize it's collection but has only manage a tiny fraction of the 18,000 manuscripts they hold.
Largely it's a problem of money and staff, obtaining, preserving and cataloguing these manuscripts isn't cheap, let alone studying them all. Even preliminary analysis of the manuscripts available in libraries is a task that will take millions of man-hours.