The ULA operated on a master clock frequency of 14 MHz. This was divided down to generate the 3.5 MHz clock signal required by the Z80A CPU.
For searchable text, study guides, and academic sharing, technical readers often refer to digital document repositories like Yumpu . The Zx Spectrum Ula How To Design A Microcomputer Pdf 57l
Here’s a structured write-up you could use for a blog, catalog entry, or study guide: The ULA operated on a master clock frequency of 14 MHz