module PPU (CLK, nRST, nINT, nDBE, CPU_RnW, CPU_D, RS, EXT, nRD, nWR, AD, A, ALE, VIDEO);
	input CLK;
	input nRST;
	output nINT;
	inout [3:0] EXT;
	// CPU I/F
	input nDBE;
	input CPU_RnW;
	inout [7:0] CPU_D;
	input [2:0] RS;
	// VRAM I/F
	output nRD;
	output nWR;
	inout [7:0] AD;
	output [13:8] A;
	output ALE;
	output VIDEO;
endmodule // PPU