3 ms·

https://wiki.nesdev.com/w/index.php/PPU_registers#Controller_.28.242000.29_.3E_write https://wiki.nesdev.com/w/index.php/PPU_registers#Controller... states that

by jepler 9y ago

https://wiki.nesdev.com/w/index.php/PPU_registers#Controller_.28.242000.29_.3E_write https://wiki.nesdev.com/w/index.php/PPU_registers#Controller... states that bit 7 of the register at $2000 (which they call PPUCTRL, and this disassembly calls PPU_CTRL_REG1) will "generate an NMI at the start of the vertical blanking interval"