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4 лет назад от японский (на самом деле dzaibacu)
"tatta" derivers from "tada". That’s why the words are similar, but, as you noticed, tatta focuses only on the number. By contrast tada carries the sense of “nothing else than ...”. So, tada is often used with “nomi” or “dake”
Let me give you some examples.
A single house was on the hill.
→ Oka no ue ni tada ikken, ie ga atta. (It emphasises that there was nothing else than the house.)
→ Oka no ue ni tatta ikken, ie ga atta. (It emphasizes that there was only one house.)

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