[SPECTRUM] Video top left pixels fix and NMI on F11

cores/spectrum/divmmc.v

@@ -52,6 +52,7 @@ always @(posedge clk) begin
 		m1_trigger <= 1'b0;
 		paged_in <= 1'b0;
 		ctrl <= 8'h00;
+		sd_cs <= 1'b1;
 	end else begin
 		spi_rx_strobe = 1'b0;
 		spi_tx_strobe = 1'b0;

cores/spectrum/keyboard.vhd

@@ -52,7 +52,9 @@ port (
 	-- CPU address bus (row)
 	A			:	in	std_logic_vector(15 downto 0);
 	-- Column outputs to ULA
-	KEYB		:	out	std_logic_vector(4 downto 0)
+	KEYB		:	out	std_logic_vector(4 downto 0);
+
+	F11		:	out	std_logic
 	);
 end keyboard;
 
@@ -204,6 +206,8 @@ begin
 					when X"76" =>	keys(0)(0) <= release; -- Escape (CAPS SPACE)
 									keys(7)(0) <= release;
 					
+					when X"78" =>	F11 <= release;        -- F11 key
+
 					when others =>
 						null;
 					end case;

cores/spectrum/spectrum_mist.vhd

@@ -450,7 +450,9 @@ port (
 	-- CPU address bus (row)
 	A			:	in	std_logic_vector(15 downto 0);
 	-- Column outputs to ULA
-	KEYB		:	out	std_logic_vector(4 downto 0)
+	KEYB		:	out	std_logic_vector(4 downto 0);
+	
+	F11 : out std_logic
 	);
 end component;
 
@@ -601,6 +603,7 @@ signal divmmc_paged_in : std_logic;
 signal divmmc_sram_page: std_logic_vector(3 downto 0);
 signal divmmc_mapram   : std_logic;
 signal divmmc_conmem   : std_logic;
+signal key_f11         : std_logic;
 
 -- Master clock - 28 MHz
 signal clk112      	:	std_logic;
@@ -822,7 +825,8 @@ begin
 		d     =>		sdram_do
 	);
 
-	LED <= '0';
+	-- use led as the sd card access led
+	LED <= divmmc_cs;
 	
 	process(clock)
 	begin
@@ -928,15 +932,15 @@ begin
 	cpu_irq_n <= vid_irq_n;
 	-- Unused CPU input signals
 	cpu_wait_n <= '1';
-	-- trigger nmi either with the OSD or with the joystick
-	cpu_nmi_n <= '0' when status(2) = '1' or joystickA(7) = '1' or joystickB(7) = '1' else '1';
+	-- trigger nmi either with F11, the OSD or with the joystick
+	cpu_nmi_n <= '0' when key_f11 = '1' or status(2) = '1' or joystickA(7) = '1' or joystickB(7) = '1' else '1';
 	cpu_busreq_n <= '1';
 		
 	-- Keyboard
 	kb:	keyboard port map (
 		clock, reset_n,
 		ps2_clk, ps2_data,
-		cpu_a, keyb
+		cpu_a, keyb, key_f11
 		);
 		
 	-- ULA port
@@ -952,7 +956,7 @@ begin
 		
 	-- ULA video
 	vid: video port map (
-		clock, vid_clken, reset_n,
+		clock, vid_clken, pll_locked, -- reset_n,
 		not scandoubler_disable,
 		vid_a, sdram_do, vid_rd_n, vid_wait_n,
 		ula_border,

cores/spectrum/video.vhd

@@ -356,7 +356,7 @@ begin
 				vblanking <= '1';
 				vsync <= '1';
 				-- Assert vsync interrupt
-				nIRQ <= '0';
+				nIRQ <= '0'; 
 			when "0111111" =>
 				-- End of vsync after 4 lines (line 252)
 				vsync <= '0';					
@@ -364,7 +364,7 @@ begin
 				-- End of blanking and start of top border (line 256)
 				-- Should be line 264 but this is simpler and doesn't really make
 				-- any difference
-				vblanking <= '0';
+				vblanking <= '0'; 
 			when others =>
 				null;
 			end case;
@@ -372,7 +372,8 @@ begin
 			-- Wrap vertical counter at line 312-1,
 			-- Top counter value is 623 for VGA, 622 for PAL
 			if vcounter(9 downto 1) = "100110111" then
-				if (VGA = '1' and vcounter(0) = '1') or VGA = '0' then
+				if ((VGA = '1' and vcounter(0) = '1' and hcounter = "1101111110") or
+					 (VGA = '0' and                       hcounter = "1101111111")) then
 					-- Start of picture area
 					vcounter <= (others => '0');
 					-- Increment the flash counter once per frame