I have seen mentiones of a few texts about Mogadishu and Southern-central of the ones that survived(it is mostly covers the 1600s rebellion against the Ajuran(The taxers) Sultan/Imam, the political and economic upheaval), similar to the surviving chronicles in Northern-Western area. Midas you posted a screen shot discussing a few of them in a
different thread, Tarikh Al-Mulikh (History of kings), Tarikh Al-Walasma (History of Walashma Dynasty), Tarikh Al-Mujahidin(The history of the Mujahiduns against the Habesha) and the early Awsa texts .
What was left out from it is that there is also the chronicle Tarikh Al-Gadabursi (Mentions their patriarch Imam Ali Said's alliance with the Awdal sultans in their fight against Abyssinia and Ugas Malik resistance against Oromo invasion in year 1575) it was copied by
I'M Lewis and Wagner from private hands and a few other manuscripts from Northern Somalia was brought to European Libraries.
I asked Jama Muse Jama about this a few years back and he said they donated this chronicle to the Somali museum before the civil war in 1990. It was 1 of the thousands of historical manuscripts donated to the Somali Museum.
A lot of the chronicles/documents about that regions history do not always come from Harar, a big chunk of them were written on the northern coast or produced/survived elsewhere even as far as Yemen and then was brought there to Harar. There was widespread circulation of texts and Harar sometimes acted as a central collection place.
It's likely that the written historical production in Northern-Western Somalia took a different nature from South-Central(Mogadishu area) as it was mostly a state led enterprise concerned with documenting the struggle(Jihad) and political formation by central state actors as an extension of the political conflict and resistance to the Christian Abyssinia.
In all accounts, Zayla seem to have been the source and center of Somali Medieval civilization. It was the most important city in the Horn and East Africa before Mogadishu.
Keep in mind that most of the literature from the medieval period has been lost due to political fragmentation and economic/urban decline that happened between 1600-1800, we are only left with fractions (reminiscent of what happened to 90% of the literature Post-Roman collapse in Europe:
How 90% of Ancient Literature was Lost ). Then you saw a reversal revival trend in the modern period between 1800s and early 1900s with a boom in written production and literacy.
Tradition to Text: Writing Local Somali History in Mid 19th century. During this time you also a proliferation of Ulema.
Even though writings produced in the 19th-20th century is more than l
ikely to be less historically reliable when talking about prior periods before them and are more rooted in the social-political context of their contemporary times as some of them go against older sources and established traditions and they mix/replace information only known to people who live in the contemporary(19th-20th century), and often undertaken under colonial request/commission.