Does anyone have any info on the story behind the upper case hooked B,
D, K, and Y consonants (Ɓ, Ɗ, Ƙ, and Ƴ)?

At the time of publication of the Africa Alphabet (2nd ed., 1930), a
Cyrillic-like Ƃ was used. When was the current uppercase form
developed and linked to the lowercase form?

TIA for any info. Don


Ref:
http://www.bisharat.net/Documents/poal30.htm (Zulu sample text)
Thanks to Denis Moyogo Jacquerye for raising a question re the form
used in this document.

See also:
http://en.wikipedia.org/wiki/Talk:%C6%81