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- 06:03, 3 April 2023 Lidnariq talk contribs created page Casio PV-1000/ULA registers (Created page with "The µPD65010G031 ULA has 10 total ports. They are fully decoded, available via Z80 I/O instructions at $F8-$FF. There are eight write-only functions and two read-only functions. === Square 1 ($F8) > write === 7 bit 0 ..PP PPPP || |||| ++-++++--- Period for first square wave. f<sub>square</sub> = f<sub>ULA</sub> ÷ 1024 ÷ (63-P) ≈ 8739 Hz ÷ (63-P) Where f<sub>ULA</sub> is the 17.897727MHz crystal divided by 2. If P is specified to be 63, it instead si...")
