Another contemporary chronicle by Mahmud Kati. John Hunwick also worked on this. Often, search engines confuse the two. If you want a PDF of the Tarikh al-Fattash (also vital for Songhai history), look for the translation by D. T. Niane.
The "Tarikh al-Sudan" (تاريخ السودان) is a historical manuscript written by Abd al-Rahman as-Sadi, a 17th-century Sudanese historian. The book is a valuable source of information on the history of the Sahel region, particularly the Songhai Empire and the Bilad as-Sudan (Land of the Blacks). tarikh al-sudan english translation pdf
Finding a full, free PDF of the English translation of Tarikh al-Sudan can be tricky because the most recognized translation— by John Hunwick—is a copyrighted academic work. About the Text Another contemporary chronicle by Mahmud Kati
(Pulate translation, 1965, p. 3)
Details the collapse of the Songhai Empire, the invasion by Moroccan forces equipped with firearms, and the subsequent establishment of the Arma bureaucracy (a ruling military caste of which the author was a member). Life in Timbuktu: If you want a PDF of the Tarikh