test for FAP text mode display

fap_textmode_blocktest.v

always @(*)
begin
	// inside active region
	if ((vc >= vbp && vc < vfp) && (hc >= hbp && hc < hfp))
	begin
		vram_rd_low = 0;
		hpos = hc - hbp;
		vpos = vc - vbp;
		hdot = hpos[2:0];
		vdot = vpos[3:0];
		hchar = hpos[9:3];
		vchar = vpos[9:4];
		vram_addr = 80 * vchar + hchar;
		red = vram_data[1:0];
		green = vram_data[3:2];
		blue = vram_data[5:4];
	end
	//  outside active region
	else
	begin
		vram_rd_low = 1;
		red = 0;
		green = 0;
		blue = 0;
	end
end