It's fine for detecting writes to the correct address. It's not so fine for a reset generator because a game could run in a loop in RAM. What we need to solve is the logic to unlock and clear the register on reset and lock it again before the game starts.FARID wrote:Are you sure /ROMSEL remains stable enough to serve as a clock signal?I meant why not connect /ROMSEL instead of Q7 to its ↑CLK input?
To what extent are you willing to verify that? A ROM could as easily use $F8-$FF instead of $00-$07 and still conform to UNROM's API.lidnariq wrote:As long as the values written have [D3] clear, it should be fine...