Method writeControl

nes/ppu.go:243–254

$2000: PPUCTRL

(value byte)

// $2000: PPUCTRL
func (ppu *PPU) writeControl(value byte) {
	ppu.flagNameTable = (value >> 0) & 3
	ppu.flagIncrement = (value >> 2) & 1
	ppu.flagSpriteTable = (value >> 3) & 1
	ppu.flagBackgroundTable = (value >> 4) & 1
	ppu.flagSpriteSize = (value >> 5) & 1
	ppu.flagMasterSlave = (value >> 6) & 1
	ppu.nmiOutput = (value>>7)&1 == 1
	ppu.nmiChange()
	// t: ....BA.. ........ = d: ......BA
	ppu.t = (ppu.t & 0xF3FF) | ((uint16(value) & 0x03) << 10)
}

// $2001: PPUMASK
func (ppu *PPU) writeMask(value byte) {