From 6478ee115dff48f1de6a05e2227dc3671bd6dc3a Mon Sep 17 00:00:00 2001
From: Gyorgy Szombathelyi <gyurco@freemail.hu>
Date: Thu, 10 Dec 2020 22:57:38 +0100
Subject: [PATCH 01/12] MiST: add FPGA->ARM transfer

---
 common/mist/data_io.v | 61 ++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 54 insertions(+), 7 deletions(-)

diff --git a/common/mist/data_io.v b/common/mist/data_io.v
index 8941fe45..9db519d5 100644
--- a/common/mist/data_io.v
+++ b/common/mist/data_io.v
@@ -28,18 +28,20 @@ module data_io
 	input             SPI_SS2,
 	input             SPI_SS4,
 	input             SPI_DI,
-	input             SPI_DO, // yes, SPI_DO is input when SS4 active
+	inout reg         SPI_DO,
 
 	input             clkref_n, // assert ioctl_wr one cycle after clkref stobe (negative active)
 
 	// ARM -> FPGA download
 	output reg        ioctl_download = 0, // signal indicating an active download
+	output reg        ioctl_upload = 0,   // signal indicating an active upload
 	output reg  [7:0] ioctl_index,        // menu index used to upload the file ([7:6] - extension index, [5:0] - menu index)
 	                                      // Note: this is also set for user_io mounts.
 	                                      // Valid when ioctl_download = 1 or when img_mounted strobe is active in user_io.
 	output reg        ioctl_wr,           // strobe indicating ioctl_dout valid
 	output reg [24:0] ioctl_addr,
 	output reg  [7:0] ioctl_dout,
+	input       [7:0] ioctl_din,
 	output reg [23:0] ioctl_fileext,      // file extension
 	output reg [31:0] ioctl_filesize      // file size
 );
@@ -55,18 +57,34 @@ reg        rclk   = 0;
 reg        rclk2  = 0;
 reg        addr_reset = 0;
 reg        downloading_reg = 0;
+reg        uploading_reg = 0;
 
 localparam DIO_FILE_TX      = 8'h53;
 localparam DIO_FILE_TX_DAT  = 8'h54;
 localparam DIO_FILE_INDEX   = 8'h55;
 localparam DIO_FILE_INFO    = 8'h56;
+localparam DIO_FILE_RX      = 8'h57;
+localparam DIO_FILE_RX_DAT  = 8'h58;
 
 // data_io has its own SPI interface to the io controller
+always@(negedge SPI_SCK or posedge SPI_SS2) begin : SPI_TRANSMITTER
+	reg [7:0] dout_r;
+
+	if(SPI_SS2) begin
+		SPI_DO <= 1'bZ;
+	end else begin
+
+		if (cnt == 15) dout_r <= ioctl_din;
+		SPI_DO <= dout_r[~cnt[2:0]];
+	end
+end
+
+reg  [7:0] cmd;
+reg  [3:0] cnt;
+reg  [5:0] bytecnt;
+
 always@(posedge SPI_SCK, posedge SPI_SS2) begin : SPI_RECEIVER
 	reg  [6:0] sbuf;
-	reg  [7:0] cmd;
-	reg  [3:0] cnt;
-	reg  [5:0] bytecnt;
 	reg [24:0] addr;
 
 	if(SPI_SS2) begin
@@ -95,12 +113,27 @@ always@(posedge SPI_SCK, posedge SPI_SS2) begin : SPI_RECEIVER
 			end
 		end
 
+		if((cmd == DIO_FILE_RX) && (cnt == 15)) begin
+			// prepare
+			if(SPI_DI) begin
+				addr_reset <= ~addr_reset;
+				uploading_reg <= 1;
+			end else begin
+				uploading_reg <= 0;
+			end
+		end
+
 		// command 0x54: UIO_FILE_TX
 		if((cmd == DIO_FILE_TX_DAT) && (cnt == 15)) begin
 			data_w <= {sbuf, SPI_DI};
 			rclk <= ~rclk;
 		end
 
+		// command 0x57: UIO_FILE_RX
+		if((cmd == DIO_FILE_RX_DAT) && (cnt == 15)) begin
+			rclk <= ~rclk;
+		end
+
 		// expose file (menu) index
 		if((cmd == DIO_FILE_INDEX) && (cnt == 15)) ioctl_index <= {sbuf, SPI_DI};
 
@@ -162,7 +195,7 @@ always@(posedge clk_sys) begin : DATA_OUT
 	reg rclk2D, rclk2D2;
 	reg addr_resetD, addr_resetD2;
 
-	reg wr_int, wr_int_direct;
+	reg wr_int, wr_int_direct, rd_int;
 	reg [24:0] addr;
 	reg [31:0] filepos;
 
@@ -179,7 +212,13 @@ always@(posedge clk_sys) begin : DATA_OUT
 		wr_int_direct <= 0;
 	end
 
+	if (!uploading_reg) begin
+		ioctl_upload <= 0;
+		rd_int <= 0;
+	end
+
 	if (~clkref_n) begin
+		rd_int <= 0;
 		wr_int <= 0;
 		wr_int_direct <= 0;
 		if (wr_int || wr_int_direct) begin
@@ -188,17 +227,25 @@ always@(posedge clk_sys) begin : DATA_OUT
 			addr <= addr + 1'd1;
 			ioctl_addr <= addr;
 		end
+		if (rd_int) begin
+			ioctl_addr <= ioctl_addr + 1'd1;
+		end
 	end
 
 	// detect transfer start from the SPI receiver
 	if(addr_resetD ^ addr_resetD2) begin
 		addr <= START_ADDR;
+		ioctl_addr <= START_ADDR;
 		filepos <= 0;
-		ioctl_download <= 1;
+		ioctl_download <= downloading_reg;
+		ioctl_upload <= uploading_reg;
 	end
 
 	// detect new byte from the SPI receiver
-	if (rclkD ^ rclkD2)   wr_int <= 1;
+	if (rclkD ^ rclkD2) begin
+		wr_int <= downloading_reg;
+		if (uploading_reg) rd_int <= uploading_reg;
+	end
 	if (rclk2D ^ rclk2D2 && filepos != ioctl_filesize) begin
 		filepos <= filepos + 1'd1;
 		wr_int_direct <= 1;

From bec9ee23f9bb887f53e9c1f491ab1eb131988bfc Mon Sep 17 00:00:00 2001
From: Gyorgy Szombathelyi <gyurco@freemail.hu>
Date: Thu, 10 Dec 2020 22:59:57 +0100
Subject: [PATCH 02/12] SpyHunter: save RAM to SD-Card

---
 .../SpyHunter_MiST/SpyHunter.qsf              |  5 +++--
 .../SpyHunter_MiST/rtl/SpyHunter_MiST.sv      | 14 +++++++++++---
 .../SpyHunter_MiST/rtl/spy_hunter.vhd         | 19 +++++++++++++------
 3 files changed, 27 insertions(+), 11 deletions(-)

diff --git a/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/SpyHunter.qsf b/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/SpyHunter.qsf
index 1166b57b..e048138c 100644
--- a/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/SpyHunter.qsf	
+++ b/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/SpyHunter.qsf	
@@ -41,7 +41,7 @@
 # ========================
 set_global_assignment -name PROJECT_OUTPUT_DIRECTORY output_files
 set_global_assignment -name NUM_PARALLEL_PROCESSORS ALL
-set_global_assignment -name LAST_QUARTUS_VERSION 13.1
+set_global_assignment -name LAST_QUARTUS_VERSION "13.1 SP4.26"
 set_global_assignment -name PRE_FLOW_SCRIPT_FILE "quartus_sh:rtl/build_id.tcl"
 
 # Pin & Location Assignments
@@ -214,7 +214,7 @@ set_global_assignment -name PARTITION_NETLIST_TYPE SOURCE -section_id Top
 set_global_assignment -name PARTITION_FITTER_PRESERVATION_LEVEL PLACEMENT_AND_ROUTING -section_id Top
 set_global_assignment -name PARTITION_COLOR 16764057 -section_id Top
 set_global_assignment -name ENABLE_SIGNALTAP OFF
-set_global_assignment -name USE_SIGNALTAP_FILE output_files/csd.stp
+set_global_assignment -name USE_SIGNALTAP_FILE output_files/cmos.stp
 set_global_assignment -name CYCLONEII_OPTIMIZATION_TECHNIQUE SPEED
 set_global_assignment -name SYNTH_TIMING_DRIVEN_SYNTHESIS ON
 set_global_assignment -name OPTIMIZE_HOLD_TIMING "ALL PATHS"
@@ -241,4 +241,5 @@ set_global_assignment -name QIP_FILE ../../../common/CPU/T80/T80.qip
 set_global_assignment -name VHDL_FILE ../../../common/Sound/ym2149/vol_table_array.vhd
 set_global_assignment -name VHDL_FILE ../../../common/Sound/ym2149/YM2149.vhd
 set_global_assignment -name QIP_FILE ../../../common/mist/mist.qip
+set_global_assignment -name SIGNALTAP_FILE output_files/cmos.stp
 set_instance_assignment -name PARTITION_HIERARCHY root_partition -to | -section_id Top
\ No newline at end of file
diff --git a/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/rtl/SpyHunter_MiST.sv b/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/rtl/SpyHunter_MiST.sv
index dda40f9f..b3d9639a 100644
--- a/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/rtl/SpyHunter_MiST.sv	
+++ b/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/rtl/SpyHunter_MiST.sv	
@@ -54,6 +54,7 @@ localparam CONF_STR = {
 	"O6,Service,Off,On;",
 	"O8,Demo Sounds,Off,On;",
 	"O9,Show Lamps,Off,On;",
+	"R2048,Save settings;",
 	"T0,Reset;",
 	"V,v1.1.",`BUILD_DATE
 };
@@ -121,21 +122,26 @@ wire [15:0] csd_do;
 wire [14:0] sp_addr;
 wire [31:0] sp_do;
 wire        ioctl_downl;
+wire        ioctl_upl;
 wire  [7:0] ioctl_index;
 wire        ioctl_wr;
 wire [24:0] ioctl_addr;
 wire  [7:0] ioctl_dout;
+wire  [7:0] ioctl_din;
 
 data_io data_io(
 	.clk_sys       ( clk_sys      ),
 	.SPI_SCK       ( SPI_SCK      ),
 	.SPI_SS2       ( SPI_SS2      ),
 	.SPI_DI        ( SPI_DI       ),
+	.SPI_DO        ( SPI_DO       ),
 	.ioctl_download( ioctl_downl  ),
+	.ioctl_upload  ( ioctl_upl    ),
 	.ioctl_index   ( ioctl_index  ),
 	.ioctl_wr      ( ioctl_wr     ),
 	.ioctl_addr    ( ioctl_addr   ),
-	.ioctl_dout    ( ioctl_dout   )
+	.ioctl_dout    ( ioctl_dout   ),
+	.ioctl_din     ( ioctl_din    )
 );
 
 // ROM structure:
@@ -200,7 +206,7 @@ always @(posedge clk_sys) begin
 
 	ioctl_wr_last <= ioctl_wr;
 	if (ioctl_downl) begin
-		if (~ioctl_wr_last && ioctl_wr) begin
+		if (~ioctl_wr_last && ioctl_wr && ioctl_index == 0) begin
 			port1_req <= ~port1_req;
 			port2_req <= ~port2_req;
 		end
@@ -281,7 +287,9 @@ spy_hunter spy_hunter(
 	.sp_graphx32_do ( sp_do         ),
 	.dl_addr      ( ioctl_addr[18:0]),
 	.dl_data      ( ioctl_dout      ),
-	.dl_wr        ( ioctl_wr        )
+	.dl_wr        ( ioctl_wr && ioctl_index == 0 ),
+	.up_data      ( ioctl_din       ),
+	.cmos_wr      ( ioctl_wr && ioctl_index == 8'hff )
 );
 
 wire vs_out;
diff --git a/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/rtl/spy_hunter.vhd b/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/rtl/spy_hunter.vhd
index 36bfc47f..9099b961 100644
--- a/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/rtl/spy_hunter.vhd	
+++ b/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/rtl/spy_hunter.vhd	
@@ -185,6 +185,8 @@ port(
   dl_addr        : in std_logic_vector(18 downto 0);
   dl_data        : in std_logic_vector(7 downto 0);
   dl_wr          : in std_logic;
+  up_data        : out std_logic_vector(7 downto 0);
+  cmos_wr        : in std_logic;
 
   dbg_cpu_addr : out std_logic_vector(15 downto 0)
  );
@@ -938,14 +940,19 @@ port map (
 --);
 
 -- working RAM   F000-F7FF  2Ko
-wram : entity work.cmos_ram
+wram : entity work.dpram
 generic map( dWidth => 8, aWidth => 11)
 port map(
- clk  => clock_vidn,
- we   => wram_we,
- addr => cpu_addr(10 downto 0),
- d    => cpu_do,
- q    => wram_do
+ clk_a  => clock_vidn,
+ addr_a => cpu_addr(10 downto 0),
+ d_a    => cpu_do,
+ we_a   => wram_we,
+ q_a    => wram_do,
+ clk_b  => clock_vid,
+ we_b   => cmos_wr,
+ addr_b => dl_addr(10 downto 0),
+ d_b    => dl_data,
+ q_b    => up_data
 );
 
 -- char RAM   E800-EBFF  1Ko + mirroring 0400

From 5b8795a62154bc3106cf981aa063a74eb19fab3f Mon Sep 17 00:00:00 2001
From: Gyorgy Szombathelyi <gyurco@freemail.hu>
Date: Fri, 11 Dec 2020 01:08:21 +0100
Subject: [PATCH 03/12] MiST: simplify data_io a bit

---
 common/mist/data_io.v | 92 +++++++++++++++++++++----------------------
 1 file changed, 46 insertions(+), 46 deletions(-)

diff --git a/common/mist/data_io.v b/common/mist/data_io.v
index 9db519d5..1a8552a2 100644
--- a/common/mist/data_io.v
+++ b/common/mist/data_io.v
@@ -73,19 +73,17 @@ always@(negedge SPI_SCK or posedge SPI_SS2) begin : SPI_TRANSMITTER
 	if(SPI_SS2) begin
 		SPI_DO <= 1'bZ;
 	end else begin
-
-		if (cnt == 15) dout_r <= ioctl_din;
-		SPI_DO <= dout_r[~cnt[2:0]];
+		{SPI_DO, dout_r} <= (cnt == 15) ? {dout_r[7], ioctl_din} : {dout_r, 1'b0};
 	end
 end
 
-reg  [7:0] cmd;
 reg  [3:0] cnt;
-reg  [5:0] bytecnt;
 
 always@(posedge SPI_SCK, posedge SPI_SS2) begin : SPI_RECEIVER
 	reg  [6:0] sbuf;
 	reg [24:0] addr;
+	reg  [7:0] cmd;
+	reg  [5:0] bytecnt;
 
 	if(SPI_SS2) begin
 		bytecnt <= 0;
@@ -102,52 +100,53 @@ always@(posedge SPI_SCK, posedge SPI_SS2) begin : SPI_RECEIVER
 		// finished command byte
 		if(cnt == 7) cmd <= {sbuf, SPI_DI};
 
-		// prepare/end transmission
-		if((cmd == DIO_FILE_TX) && (cnt == 15)) begin
-			// prepare
-			if(SPI_DI) begin
-				addr_reset <= ~addr_reset;
-				downloading_reg <= 1;
-			end else begin
-				downloading_reg <= 0;
+		if(cnt == 15) begin
+			case (cmd)
+			// prepare/end transmission
+			DIO_FILE_TX: begin
+				// prepare
+				if(SPI_DI) begin
+					addr_reset <= ~addr_reset;
+					downloading_reg <= 1;
+				end else begin
+					downloading_reg <= 0;
+				end
 			end
-		end
 
-		if((cmd == DIO_FILE_RX) && (cnt == 15)) begin
-			// prepare
-			if(SPI_DI) begin
-				addr_reset <= ~addr_reset;
-				uploading_reg <= 1;
-			end else begin
-				uploading_reg <= 0;
+			DIO_FILE_RX: begin
+				// prepare
+				if(SPI_DI) begin
+					addr_reset <= ~addr_reset;
+					uploading_reg <= 1;
+				end else begin
+					uploading_reg <= 0;
+				end
 			end
-		end
 
-		// command 0x54: UIO_FILE_TX
-		if((cmd == DIO_FILE_TX_DAT) && (cnt == 15)) begin
-			data_w <= {sbuf, SPI_DI};
-			rclk <= ~rclk;
-		end
+			// command 0x57: DIO_FILE_RX_DAT
+			// command 0x54: DIO_FILE_TX_DAT
+			DIO_FILE_RX_DAT,
+			DIO_FILE_TX_DAT: begin
+				data_w <= {sbuf, SPI_DI};
+				rclk <= ~rclk;
+			end
 
-		// command 0x57: UIO_FILE_RX
-		if((cmd == DIO_FILE_RX_DAT) && (cnt == 15)) begin
-			rclk <= ~rclk;
-		end
+			// expose file (menu) index
+			DIO_FILE_INDEX: ioctl_index <= {sbuf, SPI_DI};
 
-		// expose file (menu) index
-		if((cmd == DIO_FILE_INDEX) && (cnt == 15)) ioctl_index <= {sbuf, SPI_DI};
-
-		// receiving FAT directory entry (mist-firmware/fat.h - DIRENTRY)
-		if((cmd == DIO_FILE_INFO) && (cnt == 15)) begin
-			bytecnt <= bytecnt + 1'd1;
-			case (bytecnt)
-				8'h08: ioctl_fileext[23:16]  <= {sbuf, SPI_DI};
-				8'h09: ioctl_fileext[15: 8]  <= {sbuf, SPI_DI};
-				8'h0A: ioctl_fileext[ 7: 0]  <= {sbuf, SPI_DI};
-				8'h1C: ioctl_filesize[ 7: 0] <= {sbuf, SPI_DI};
-				8'h1D: ioctl_filesize[15: 8] <= {sbuf, SPI_DI};
-				8'h1E: ioctl_filesize[23:16] <= {sbuf, SPI_DI};
-				8'h1F: ioctl_filesize[31:24] <= {sbuf, SPI_DI};
+			// receiving FAT directory entry (mist-firmware/fat.h - DIRENTRY)
+			DIO_FILE_INFO: begin
+				bytecnt <= bytecnt + 1'd1;
+				case (bytecnt)
+					8'h08: ioctl_fileext[23:16]  <= {sbuf, SPI_DI};
+					8'h09: ioctl_fileext[15: 8]  <= {sbuf, SPI_DI};
+					8'h0A: ioctl_fileext[ 7: 0]  <= {sbuf, SPI_DI};
+					8'h1C: ioctl_filesize[ 7: 0] <= {sbuf, SPI_DI};
+					8'h1D: ioctl_filesize[15: 8] <= {sbuf, SPI_DI};
+					8'h1E: ioctl_filesize[23:16] <= {sbuf, SPI_DI};
+					8'h1F: ioctl_filesize[31:24] <= {sbuf, SPI_DI};
+				endcase
+			end
 			endcase
 		end
 	end
@@ -244,8 +243,9 @@ always@(posedge clk_sys) begin : DATA_OUT
 	// detect new byte from the SPI receiver
 	if (rclkD ^ rclkD2) begin
 		wr_int <= downloading_reg;
-		if (uploading_reg) rd_int <= uploading_reg;
+		rd_int <= uploading_reg;
 	end
+	// direct transfer receiver
 	if (rclk2D ^ rclk2D2 && filepos != ioctl_filesize) begin
 		filepos <= filepos + 1'd1;
 		wr_int_direct <= 1;

From 2c442684df518e04d8fb200bd19f2a5583d4af2b Mon Sep 17 00:00:00 2001
From: Gyorgy Szombathelyi <gyurco@freemail.hu>
Date: Fri, 11 Dec 2020 14:07:40 +0100
Subject: [PATCH 04/12] Midway MCR3: allow saving the work RAM

---
 Arcade_MiST/Midway MCR 3/README.txt       |  4 ++++
 Arcade_MiST/Midway MCR 3/rtl/MCR3_MiST.sv | 19 +++++++++++++------
 Arcade_MiST/Midway MCR 3/rtl/mcr3.vhd     | 21 ++++++++++++++-------
 3 files changed, 31 insertions(+), 13 deletions(-)

diff --git a/Arcade_MiST/Midway MCR 3/README.txt b/Arcade_MiST/Midway MCR 3/README.txt
index a8985032..2fceb179 100644
--- a/Arcade_MiST/Midway MCR 3/README.txt	
+++ b/Arcade_MiST/Midway MCR 3/README.txt	
@@ -71,6 +71,10 @@ Copy the ROM files to the root of the SD Card.
 
 MRA utilty: https://github.com/sebdel/mra-tools-c
 
+Some games are storing settings/high scores in a non-volatile RAM. It can be saved to
+the SD Card with the "Save settings" option in the OSD menu. It'll be restored when
+the core is loaded next time.
+
 Based on Darfpga's work:
 ---------------------------------------------------------------------------------
 -- DE10_lite Top level for Timber (Midway MCR) by Dar (darfpga@aol.fr) (22/11/2019)
diff --git a/Arcade_MiST/Midway MCR 3/rtl/MCR3_MiST.sv b/Arcade_MiST/Midway MCR 3/rtl/MCR3_MiST.sv
index 65c17508..28a16022 100644
--- a/Arcade_MiST/Midway MCR 3/rtl/MCR3_MiST.sv	
+++ b/Arcade_MiST/Midway MCR 3/rtl/MCR3_MiST.sv	
@@ -54,12 +54,13 @@ module MCR3_MiST(
 wire [6:0] core_mod;
 
 localparam CONF_STR = {
-	`CORE_NAME,";ROM;",
+	`CORE_NAME,";;",
 	"O2,Rotate Controls,Off,On;",
 	"O5,Blend,Off,On;",
 	"O6,Swap Joystick,Off,On;",
 	"DIP;",
 	"O7,Service,Off,On;",
+	"R2048,Save settings;",
 	"T0,Reset;",
 	"V,v1.1.",`BUILD_DATE
 };
@@ -220,10 +221,12 @@ user_io(
 	);
 
 wire        ioctl_downl;
+wire        ioctl_upl;
 wire  [7:0] ioctl_index;
 wire        ioctl_wr;
 wire [24:0] ioctl_addr;
 wire  [7:0] ioctl_dout;
+wire  [7:0] ioctl_din;
 
 /*
 ROM structure:
@@ -249,10 +252,12 @@ data_io #(.ROM_DIRECT_UPLOAD(1)) data_io(
 	.SPI_DI        ( SPI_DI       ),
 	.SPI_DO        ( SPI_DO       ),
 	.ioctl_download( ioctl_downl  ),
+	.ioctl_upload  ( ioctl_upl    ),
 	.ioctl_index   ( ioctl_index  ),
 	.ioctl_wr      ( ioctl_wr     ),
 	.ioctl_addr    ( ioctl_addr   ),
-	.ioctl_dout    ( ioctl_dout   )
+	.ioctl_dout    ( ioctl_dout   ),
+	.ioctl_din     ( ioctl_din    )
 );
 
 wire [15:0] rom_addr;
@@ -328,7 +333,7 @@ always @(posedge clk_sys) begin
 
 	ioctl_wr_last <= ioctl_wr;
 	if (ioctl_downl) begin
-		if (~ioctl_wr_last && ioctl_wr) begin
+		if (~ioctl_wr_last && ioctl_wr && ioctl_index == 0) begin
 			port1_req <= ~port1_req;
 			port2_req <= ~port2_req;
 		end
@@ -397,9 +402,11 @@ mcr3 mcr3 (
 	.sp_addr      ( sp_addr         ),
 	.sp_graphx32_do ( sp_do         ),
 
-	.dl_addr(ioctl_addr-gfx1_offset),
-	.dl_data(ioctl_dout),
-	.dl_wr(ioctl_wr)
+	.dl_addr      ( ioctl_addr-(ioctl_index == 0 ? gfx1_offset : 0) ),
+	.dl_data      ( ioctl_dout ),
+	.dl_wr        ( ioctl_wr && ioctl_index == 0 ),
+	.up_data      ( ioctl_din  ),
+	.cmos_wr      ( ioctl_wr && ioctl_index == 8'hff )
 );
 
 wire vs_out;
diff --git a/Arcade_MiST/Midway MCR 3/rtl/mcr3.vhd b/Arcade_MiST/Midway MCR 3/rtl/mcr3.vhd
index 0ea8fa7f..2348fc32 100644
--- a/Arcade_MiST/Midway MCR 3/rtl/mcr3.vhd	
+++ b/Arcade_MiST/Midway MCR 3/rtl/mcr3.vhd	
@@ -174,7 +174,9 @@ port(
  -- internal ROM download
  dl_addr        : in std_logic_vector(18 downto 0);
  dl_data        : in std_logic_vector(7 downto 0);
- dl_wr          : in std_logic
+ dl_wr          : in std_logic;
+ up_data        : out std_logic_vector(7 downto 0);
+ cmos_wr        : in std_logic
  );
 end mcr3;
 
@@ -741,14 +743,19 @@ begin
 end process;
 
 -- working RAM   0xE000-0xE7FF
-wram : entity work.cmos_ram
+wram : entity work.dpram
 generic map( dWidth => 8, aWidth => 11)
 port map(
- clk  => clock_vidn,
- we   => wram_we,
- addr => cpu_addr(10 downto 0),
- d    => cpu_do,
- q    => wram_do
+ clk_a  => clock_vidn,
+ addr_a => cpu_addr(10 downto 0),
+ d_a    => cpu_do,
+ we_a   => wram_we,
+ q_a    => wram_do,
+ clk_b  => clock_vid,
+ we_b   => cmos_wr,
+ addr_b => dl_addr(10 downto 0),
+ d_b    => dl_data,
+ q_b    => up_data
 );
 
 -- video RAM   0xF000-0xF7FF

From f97d946dd2555b42ce59d8d7739c3e9a274b6ee2 Mon Sep 17 00:00:00 2001
From: Gyorgy Szombathelyi <gyurco@freemail.hu>
Date: Fri, 11 Dec 2020 15:24:59 +0100
Subject: [PATCH 05/12] MiST: fix data_io upload

---
 common/mist/data_io.v | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/common/mist/data_io.v b/common/mist/data_io.v
index 1a8552a2..8ca99fcc 100644
--- a/common/mist/data_io.v
+++ b/common/mist/data_io.v
@@ -73,7 +73,8 @@ always@(negedge SPI_SCK or posedge SPI_SS2) begin : SPI_TRANSMITTER
 	if(SPI_SS2) begin
 		SPI_DO <= 1'bZ;
 	end else begin
-		{SPI_DO, dout_r} <= (cnt == 15) ? {dout_r[7], ioctl_din} : {dout_r, 1'b0};
+		if (cnt == 15) dout_r <= ioctl_din;
+		SPI_DO <= dout_r[~cnt[2:0]];
 	end
 end
 

From c9e5bf1c7ce3f6e2e29349f3de411ffa214def89 Mon Sep 17 00:00:00 2001
From: Gyorgy Szombathelyi <gyurco@freemail.hu>
Date: Fri, 11 Dec 2020 15:26:34 +0100
Subject: [PATCH 06/12] Midway MCR2: add save settings

---
 Arcade_MiST/Midway MCR 2/MCR2/README.txt      |  5 +++++
 .../Midway MCR 2/MCR2/rtl/MCR2_MiST.sv        | 18 +++++++++++-----
 .../Midway MCR 2/MCR2/rtl/satans_hollow.vhd   | 21 ++++++++++++-------
 3 files changed, 32 insertions(+), 12 deletions(-)

diff --git a/Arcade_MiST/Midway MCR 2/MCR2/README.txt b/Arcade_MiST/Midway MCR 2/MCR2/README.txt
index 2afe03e4..291aa722 100644
--- a/Arcade_MiST/Midway MCR 2/MCR2/README.txt	
+++ b/Arcade_MiST/Midway MCR 2/MCR2/README.txt	
@@ -16,6 +16,11 @@
 -- Copy the ROM files to the root of the SD Card.
 --
 -- MRA utilty: https://github.com/sebdel/mra-tools-c
+--
+-- Some games are storing settings/high scores in a non-volatile RAM. It can be saved to
+-- the SD Card with the "Save settings" option in the OSD menu. It'll be restored when
+-- the core is loaded next time.
+--
 ---------------------------------------------------------------------------------
 -- DE10_lite Top level for Satan Hollow (Midway MCR) by Dar (darfpga@aol.fr) (19/10/2019)
 -- http://darfpga.blogspot.fr
diff --git a/Arcade_MiST/Midway MCR 2/MCR2/rtl/MCR2_MiST.sv b/Arcade_MiST/Midway MCR 2/MCR2/rtl/MCR2_MiST.sv
index 11173d70..4d1de8f1 100644
--- a/Arcade_MiST/Midway MCR 2/MCR2/rtl/MCR2_MiST.sv	
+++ b/Arcade_MiST/Midway MCR 2/MCR2/rtl/MCR2_MiST.sv	
@@ -52,13 +52,14 @@ module MCR2_MiST(
 wire [6:0] core_mod;
 
 localparam CONF_STR = {
-	`CORE_NAME,";ROM;",
+	`CORE_NAME,";;",
 	"O2,Rotate Controls,Off,On;",
 	"O5,Blend,Off,On;",
 	"O6,Swap Joysticks,Off,On;",
 	"O4,Spinner speed,Low,High;",
 	"DIP;",
 	"O7,Service,Off,On;",
+	"R2048,Save settings;",
 	"T0,Reset;",
 	"V,v2.0.",`BUILD_DATE
 };
@@ -202,10 +203,12 @@ wire [15:0] rom_do;
 wire [13:0] snd_addr;
 wire [15:0] snd_do;
 wire        ioctl_downl;
+wire        ioctl_upl;
 wire  [7:0] ioctl_index;
 wire        ioctl_wr;
 wire [24:0] ioctl_addr;
 wire  [7:0] ioctl_dout;
+wire  [7:0] ioctl_din;
 
 /* ROM structure
 00000 - 0BFFF  48k CPU1
@@ -219,11 +222,14 @@ data_io data_io(
 	.SPI_SCK       ( SPI_SCK      ),
 	.SPI_SS2       ( SPI_SS2      ),
 	.SPI_DI        ( SPI_DI       ),
+	.SPI_DO        ( SPI_DO       ),
 	.ioctl_download( ioctl_downl  ),
+	.ioctl_upload  ( ioctl_upl    ),
 	.ioctl_index   ( ioctl_index  ),
 	.ioctl_wr      ( ioctl_wr     ),
 	.ioctl_addr    ( ioctl_addr   ),
-	.ioctl_dout    ( ioctl_dout   )
+	.ioctl_dout    ( ioctl_dout   ),
+	.ioctl_din     ( ioctl_din    )
 );
 reg port1_req, port2_req;
 sdram sdram(
@@ -261,7 +267,7 @@ always @(posedge clk_sys) begin
 
 	ioctl_wr_last <= ioctl_wr;
 	if (ioctl_downl) begin
-		if (~ioctl_wr_last && ioctl_wr) begin
+		if (~ioctl_wr_last && ioctl_wr && ioctl_index == 0) begin
 			port1_req <= ~port1_req;
 			port2_req <= ~port2_req;
 		end
@@ -310,8 +316,10 @@ satans_hollow satans_hollow(
 	.snd_rom_do   ( snd_addr[0] ? snd_do[15:8] : snd_do[7:0] ),
 
 	.dl_addr      ( ioctl_addr[16:0]),
-	.dl_wr        ( ioctl_wr        ),
-	.dl_data      ( ioctl_dout      )
+	.dl_wr        ( ioctl_wr && ioctl_index == 0 ),
+	.dl_data      ( ioctl_dout ),
+	.up_data      ( ioctl_din  ),
+	.cmos_wr      ( ioctl_wr && ioctl_index == 8'hff )
 );
 
 wire vs_out;
diff --git a/Arcade_MiST/Midway MCR 2/MCR2/rtl/satans_hollow.vhd b/Arcade_MiST/Midway MCR 2/MCR2/rtl/satans_hollow.vhd
index beaf5ba0..ccf8d6cf 100644
--- a/Arcade_MiST/Midway MCR 2/MCR2/rtl/satans_hollow.vhd	
+++ b/Arcade_MiST/Midway MCR 2/MCR2/rtl/satans_hollow.vhd	
@@ -169,7 +169,9 @@ port(
 
  dl_addr        : in  std_logic_vector(16 downto 0);
  dl_wr          : in  std_logic;
- dl_data        : in  std_logic_vector( 7 downto 0)
+ dl_data        : in  std_logic_vector( 7 downto 0);
+ up_data        : out std_logic_vector(7 downto 0);
+ cmos_wr        : in std_logic
  );
 end satans_hollow;
 
@@ -673,14 +675,19 @@ cpu_rom_addr <= cpu_addr(15 downto 0);
 cpu_rom_rd <= '1' when cpu_mreq_n = '0' and cpu_rd_n = '0' and cpu_addr(15 downto 12) < X"C" else '0';
 
 -- working RAM   0xC000-0xC7FF + mirroring adresses
-wram : entity work.cmos_ram
+wram : entity work.dpram
 generic map( dWidth => 8, aWidth => 11)
 port map(
- clk  => clock_vidn,
- we   => wram_we,
- addr => cpu_addr(10 downto 0),
- d    => cpu_do,
- q    => wram_do
+ clk_a  => clock_vidn,
+ addr_a => cpu_addr(10 downto 0),
+ d_a    => cpu_do,
+ we_a   => wram_we,
+ q_a    => wram_do,
+ clk_b  => clock_vid,
+ we_b   => cmos_wr,
+ addr_b => dl_addr(10 downto 0),
+ d_b    => dl_data,
+ q_b    => up_data
 );
 
 -- video RAM   0xE800-0xEFFF + mirroring adresses

From cf99d45f47e4a150a0221a44c9745da716d17801 Mon Sep 17 00:00:00 2001
From: Gyorgy Szombathelyi <gyurco@freemail.hu>
Date: Fri, 11 Dec 2020 15:37:20 +0100
Subject: [PATCH 07/12] SpyHunter: use direct ROM loading

---
 .../Midway MCR Scroll/SpyHunter_MiST/SpyHunter.qsf    |  1 +
 .../SpyHunter_MiST/rtl/SpyHunter_MiST.sv              | 11 ++++++++---
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/SpyHunter.qsf b/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/SpyHunter.qsf
index e048138c..7a8b80e7 100644
--- a/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/SpyHunter.qsf	
+++ b/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/SpyHunter.qsf	
@@ -242,4 +242,5 @@ set_global_assignment -name VHDL_FILE ../../../common/Sound/ym2149/vol_table_arr
 set_global_assignment -name VHDL_FILE ../../../common/Sound/ym2149/YM2149.vhd
 set_global_assignment -name QIP_FILE ../../../common/mist/mist.qip
 set_global_assignment -name SIGNALTAP_FILE output_files/cmos.stp
+set_location_assignment PIN_90 -to SPI_SS4
 set_instance_assignment -name PARTITION_HIERARCHY root_partition -to | -section_id Top
\ No newline at end of file
diff --git a/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/rtl/SpyHunter_MiST.sv b/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/rtl/SpyHunter_MiST.sv
index b3d9639a..ffb31fa7 100644
--- a/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/rtl/SpyHunter_MiST.sv	
+++ b/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/rtl/SpyHunter_MiST.sv	
@@ -26,10 +26,11 @@ module SpyHunter_MiST(
 	output        AUDIO_L,
 	output        AUDIO_R,
 	input         SPI_SCK,
-	output        SPI_DO,
+	inout         SPI_DO,
 	input         SPI_DI,
 	input         SPI_SS2,
 	input         SPI_SS3,
+	input         SPI_SS4,
 	input         CONF_DATA0,
 	input         CLOCK_27,
 	output [12:0] SDRAM_A,
@@ -92,7 +93,8 @@ wire  [7:0] key_code;
 wire        key_strobe;
 
 user_io #(
-	.STRLEN(($size(CONF_STR)>>3)))
+	.STRLEN(($size(CONF_STR)>>3)),
+	.ROM_DIRECT_UPLOAD(1'b1))
 user_io(
 	.clk_sys        (clk_sys        ),
 	.conf_str       (CONF_STR       ),
@@ -129,10 +131,13 @@ wire [24:0] ioctl_addr;
 wire  [7:0] ioctl_dout;
 wire  [7:0] ioctl_din;
 
-data_io data_io(
+data_io #(
+	.ROM_DIRECT_UPLOAD(1'b1))
+data_io(
 	.clk_sys       ( clk_sys      ),
 	.SPI_SCK       ( SPI_SCK      ),
 	.SPI_SS2       ( SPI_SS2      ),
+	.SPI_SS4       ( SPI_SS4      ),
 	.SPI_DI        ( SPI_DI       ),
 	.SPI_DO        ( SPI_DO       ),
 	.ioctl_download( ioctl_downl  ),

From 57eed4ec09bc83541d6dba017368d0a525c24619 Mon Sep 17 00:00:00 2001
From: Gyorgy Szombathelyi <gyurco@freemail.hu>
Date: Fri, 11 Dec 2020 18:42:45 +0100
Subject: [PATCH 08/12] Robotron HW: save settings to RAM file

---
 .../Robotron Hardware/README.md               |  3 +-
 .../rtl/RobotronFPGA_MiST.sv                  | 36 +++++++++++++++----
 .../rtl/robotron_cpu/robotron_cpu.vhd         |  3 +-
 .../Robotron Hardware/rtl/robotron_soc.vhd    |  2 ++
 4 files changed, 35 insertions(+), 9 deletions(-)

diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/README.md b/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/README.md
index 3f9997d5..d8ba0ba7 100644
--- a/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/README.md	
+++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/README.md	
@@ -19,7 +19,8 @@ Usage:
 
 Note: the MRA files contains a dump of the CMOS RAM. It will be included in the generated ROM file.
 Change it for permanent settings (search for the format online). It's possible to change these values
-inside the core, with turning on "Auto-up" switch, and activate the "Advance" trigger in the OSD.
+inside the core, with turning on "Auto-up" switch, and activate the "Advance" trigger in the OSD. Then
+it's possible to save these settings and high scores into a RAM file via the "Save settings" OSD item.
 Refer to the arcade's user manual for further info.
 
 
diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/rtl/RobotronFPGA_MiST.sv b/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/rtl/RobotronFPGA_MiST.sv
index 6ed7ffa4..bb34cf4c 100644
--- a/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/rtl/RobotronFPGA_MiST.sv	
+++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/rtl/RobotronFPGA_MiST.sv	
@@ -42,13 +42,14 @@ module RobotronFPGA_MiST(
 `define CORE_NAME "ROBOTRON"
 
 localparam CONF_STR = {
-	`CORE_NAME,";ROM;",
+	`CORE_NAME,";;",
 	"O2,Rotate Controls,Off,On;",
 	"O34,Scanlines,Off,25%,50%,75%;",
 	"O5,Blend,Off,On;",
 	"O6,Swap Joysticks,Off,On;",
 	"O7,Auto up,Off,On;",
 	"T8,Advance;",
+	"R1024,Save settings;",
 	"T0,Reset;",
 	"V,v1.0.",`BUILD_DATE
 };
@@ -263,10 +264,12 @@ user_io(
 	);
 
 wire        ioctl_downl;
+wire        ioctl_upl;
 wire  [7:0] ioctl_index;
 wire        ioctl_wr;
 wire [24:0] ioctl_addr;
 wire  [7:0] ioctl_dout;
+wire  [7:0] ioctl_din;
 
 /*
 ROM Structure:
@@ -282,14 +285,18 @@ data_io data_io (
 	.SPI_SCK       ( SPI_SCK      ),
 	.SPI_SS2       ( SPI_SS2      ),
 	.SPI_DI        ( SPI_DI       ),
+	.SPI_DO        ( SPI_DO       ),
 	.ioctl_download( ioctl_downl  ),
+	.ioctl_upload  ( ioctl_upl    ),
 	.ioctl_index   ( ioctl_index  ),
 	.ioctl_wr      ( ioctl_wr     ),
 	.ioctl_addr    ( ioctl_addr   ),
-	.ioctl_dout    ( ioctl_dout   )
+	.ioctl_dout    ( ioctl_dout   ),
+	.ioctl_din     ( ioctl_din    )
 );
 
 reg         port1_req;
+wire [15:0] port1_do;
 wire [23:1] mem_addr;
 wire [15:0] mem_do;
 wire [15:0] mem_di;
@@ -316,7 +323,7 @@ sdram #(.MHZ(96)) sdram(
 	.port1_ds      ( 2'b11 ),
 	.port1_we      ( ioctl_downl ),
 	.port1_d       ( {ioctl_dout[7:4], ioctl_dout[7:4], ioctl_dout[3:0], ioctl_dout[3:0]} ),
-	.port1_q       ( ),
+	.port1_q       ( port1_do ),
 
 	// CPU/video access
 	.cpu1_addr     ( ioctl_downl ? 17'h1ffff : sdram_addr ),
@@ -333,12 +340,18 @@ sdram #(.MHZ(96)) sdram(
 wire [17:1] sdram_addr = ~romcs ? {1'b0, mem_addr[16], ~mem_addr[16] & mem_addr[15], mem_addr[14:1]} : { 1'b1, mem_addr[16:1] };
 
 // IOCTL address to SDRAM address:
-// D000-D3FF -> 1CC00-1CFFF (CMOS), otherwise direct mapping
+// D000-D3FF (ROM) or 000-3FFF (RAM) -> 1CC00-1CFFF (CMOS), otherwise direct mapping
 
-wire [22:0] downl_addr = (ioctl_addr[22:10] == { 7'h0, 4'hD, 2'b00 }) ? { 1'b1, 4'hC, 2'b11, ioctl_addr[9:0] } : ioctl_addr[22:0];
+wire [22:0] downl_addr = 
+  ((ioctl_index == 0 && ioctl_addr[22:10] == { 7'h0, 4'hD, 2'b00 }) || ioctl_index == 8'hff) ? { 1'b1, 4'hC, 2'b11, ioctl_addr[9:0] } :
+	ioctl_addr[22:0];
+
+assign ioctl_din = { port1_do[11:8], port1_do[3:0] };
 
 always @(posedge clk_mem) begin
 	reg        ioctl_wr_last = 0;
+	reg  [9:0] cmos_addr;
+	reg        ioctl_upl_d;
 
 	ioctl_wr_last <= ioctl_wr;
 	if (ioctl_downl) begin
@@ -346,6 +359,14 @@ always @(posedge clk_mem) begin
 			port1_req <= ~port1_req;
 		end
 	end
+
+	ioctl_upl_d <= ioctl_upl;
+	cmos_addr <= ioctl_addr[9:0];
+	if (ioctl_upl) begin
+		if (cmos_addr != ioctl_addr[9:0] || !ioctl_upl_d) begin
+			port1_req <= ~port1_req;
+		end
+	end
 end
 
 reg reset = 1;
@@ -378,7 +399,8 @@ robotron_soc robotron_soc (
 
 	.blitter_sc2 ( blitter_sc2 ),
 	.sinistar    ( sinistar    ),
-	.speedball	 ( speedball	),
+	.speedball   ( speedball   ),
+	.pause       ( ioctl_upl   ),
 	.BTN         ( BTN         ),
 	.SIN_FIRE    ( ~m_fireA & ~m_fire2A ),
 	.SIN_BOMB    ( ~m_fireB & ~m_fire2B ),
@@ -403,7 +425,7 @@ robotron_soc robotron_soc (
 	.dl_clock    ( clk_mem  ),
 	.dl_addr     ( ioctl_addr[16:0] ),
 	.dl_data     ( ioctl_dout ),
-	.dl_wr       ( ioctl_wr )
+	.dl_wr       ( ioctl_wr && ioctl_index == 0 )
 );
 
 mist_video #(.COLOR_DEPTH(3), .SD_HCNT_WIDTH(11)) mist_video(
diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/rtl/robotron_cpu/robotron_cpu.vhd b/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/rtl/robotron_cpu/robotron_cpu.vhd
index 582bd55b..eaf101a9 100644
--- a/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/rtl/robotron_cpu/robotron_cpu.vhd	
+++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/rtl/robotron_cpu/robotron_cpu.vhd	
@@ -40,6 +40,7 @@ entity robotron_cpu is
         blitter_sc2      : in    std_logic;
         sinistar         : in    std_logic;
         speedball        : in    std_logic;
+        pause            : in    std_logic;
         -- MC6809 signals
         A                : in    std_logic_vector(15 downto 0);
         Dout             : in    std_logic_vector(7 downto 0);
@@ -1017,7 +1018,7 @@ begin
             -- on Q falling edge. Present once per processor clock,
             -- on Q rising edge -- just because.
             RESET_N <= not mpu_reset;
-            HALT_N <= not mpu_halt;
+            HALT_N <= not (mpu_halt or pause);
             IRQ_N <= not mpu_irq;
             FIRQ_N <= not mpu_firq;
             NMI_N <= not mpu_nmi;
diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/rtl/robotron_soc.vhd b/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/rtl/robotron_soc.vhd
index cc84a484..2a5fe9c3 100644
--- a/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/rtl/robotron_soc.vhd	
+++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/rtl/robotron_soc.vhd	
@@ -35,6 +35,7 @@ entity robotron_soc is
 port (
 	clock            : in    std_logic; -- 12MHz
 	clock_snd        : in    std_logic; -- 0.89MHz
+	pause            : in    std_logic;
 
 	-- Cellular RAM / StrataFlash
 	MemOE            : out   std_logic;
@@ -172,6 +173,7 @@ port map (
 	blitter_sc2      => blitter_sc2,
 	sinistar         => sinistar,
 	speedball        => speedball,
+	pause            => pause,
 	A                => cpu_a,
 	Dout             => cpu_dout,
 	Din              => cpu_din,

From b927a83305c8e1b56798dd6920948fbf4e986518 Mon Sep 17 00:00:00 2001
From: Gyorgy Szombathelyi <gyurco@freemail.hu>
Date: Fri, 11 Dec 2020 19:23:22 +0100
Subject: [PATCH 09/12] Defender: save CMOS RAM to .RAM file

---
 .../Defender Hardware/ReadMe.txt              |  4 ++++
 .../Defender Hardware/rtl/Defender_MiST.sv    | 16 ++++++++++----
 .../Defender Hardware/rtl/defender.vhd        | 21 ++++++++++++-------
 3 files changed, 30 insertions(+), 11 deletions(-)

diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/ReadMe.txt b/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/ReadMe.txt
index 57f083ff..fc87758d 100644
--- a/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/ReadMe.txt	
+++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/ReadMe.txt	
@@ -13,6 +13,10 @@
 --
 -- MRA utility: https://github.com/sebdel/mra-tools-c/
 --
+-- Defender stores its settings and the high score table in a non-volatile RAM.
+-- It can be saved to the SD Card with the "Save settings" OSD option, and it'll
+-- be restored next time the core is loaded.
+--
 ---------------------------------------------------------------------------------
 -- A simulation model of Williams 6809 hardware
 -- by Dar (darfpga@aol.fr)
diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/rtl/Defender_MiST.sv b/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/rtl/Defender_MiST.sv
index 042e85af..7c103d67 100644
--- a/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/rtl/Defender_MiST.sv	
+++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/rtl/Defender_MiST.sv	
@@ -37,11 +37,12 @@ module Defender_MiST(
 `define CORE_NAME "DEFENDER"
 
 localparam CONF_STR = {
-	`CORE_NAME,";ROM;",
+	`CORE_NAME,";;",
 	"O2,Rotate Controls,Off,On;",
 	"O34,Scanlines,Off,25%,50%,75%;",
 	"O5,Blend,Off,On;",
 	"DIP;",
+	"R256,Save settings;",
 	"T0,Reset;",
 	"V,v1.2.",`BUILD_DATE
 };
@@ -185,10 +186,12 @@ user_io(
 	);
 
 wire        ioctl_downl;
+wire        ioctl_upl;
 wire  [7:0] ioctl_index;
 wire        ioctl_wr;
 wire [24:0] ioctl_addr;
 wire  [7:0] ioctl_dout;
+wire  [7:0] ioctl_din;
 
 /*
 ROM Structure:
@@ -201,11 +204,14 @@ data_io data_io (
 	.SPI_SCK       ( SPI_SCK      ),
 	.SPI_SS2       ( SPI_SS2      ),
 	.SPI_DI        ( SPI_DI       ),
+	.SPI_DO        ( SPI_DO       ),
 	.ioctl_download( ioctl_downl  ),
+	.ioctl_upload  ( ioctl_upl    ),
 	.ioctl_index   ( ioctl_index  ),
 	.ioctl_wr      ( ioctl_wr     ),
 	.ioctl_addr    ( ioctl_addr   ),
-	.ioctl_dout    ( ioctl_dout   )
+	.ioctl_dout    ( ioctl_dout   ),
+	.ioctl_din     ( ioctl_din    )
 );
 
 reg         port1_req, port2_req;
@@ -252,7 +258,7 @@ always @(posedge clk_sys) begin
 	reg        snd_vma_r, snd_vma_r2;
 
 	ioctl_wr_last <= ioctl_wr;
-	if (ioctl_downl) begin
+	if (ioctl_downl && ioctl_index == 0) begin
 		if (~ioctl_wr_last && ioctl_wr) begin
 			port1_req <= ~port1_req;
 			port2_req <= ~port2_req;
@@ -306,7 +312,9 @@ defender defender (
 	.dl_clock         ( clk_sys ),
 	.dl_addr          ( ioctl_addr[15:0] ),
 	.dl_data          ( ioctl_dout ),
-	.dl_wr            ( ioctl_wr )
+	.dl_wr            ( ioctl_wr && ioctl_index == 0 ),
+	.up_data          ( ioctl_din  ),
+	.cmos_wr          ( ioctl_wr && ioctl_index == 8'hff )
 );
 
 mist_video #(.COLOR_DEPTH(3), .SD_HCNT_WIDTH(11)) mist_video(
diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/rtl/defender.vhd b/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/rtl/defender.vhd
index c90a5751..73170768 100644
--- a/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/rtl/defender.vhd	
+++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/rtl/defender.vhd	
@@ -153,7 +153,9 @@ port(
  dl_clock       : in  std_logic;
  dl_addr        : in  std_logic_vector(15 downto 0);
  dl_data        : in  std_logic_vector( 7 downto 0);
- dl_wr          : in  std_logic
+ dl_wr          : in  std_logic;
+ up_data        : out std_logic_vector(7 downto 0);
+ cmos_wr        : in std_logic
 );
 end defender;
 
@@ -567,14 +569,19 @@ port map(
 );
 
 -- cmos ram 
-cmos_ram : entity work.defender_cmos_ram
+cmos_ram : entity work.dpram
 generic map( dWidth => 4, aWidth => 8)
 port map(
- clk  => clock_6,
- we   => cmos_we,
- addr => cpu_addr(7 downto 0),
- d    => cpu_do(3 downto 0),
- q    => cmos_do
+ clk_a  => clock_6,
+ we_a   => cmos_we,
+ addr_a => cpu_addr(7 downto 0),
+ d_a    => cpu_do(3 downto 0),
+ q_a    => cmos_do,
+ clk_b  => dl_clock,
+ we_b   => cmos_wr,
+ addr_b => dl_addr(7 downto 0),
+ d_b    => dl_data(3 downto 0),
+ q_b    => up_data(3 downto 0)
 );
 
 -- cpu to video addr decoder

From 52f18ba45b09eb82a2112a0092c1d96cbdc2d083 Mon Sep 17 00:00:00 2001
From: Gyorgy Szombathelyi <gyurco@freemail.hu>
Date: Mon, 14 Dec 2020 17:08:07 +0100
Subject: [PATCH 10/12] SpyHunter: update sdc

---
 .../Midway MCR Scroll/SpyHunter_MiST/SpyHunter.sdc  | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/SpyHunter.sdc b/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/SpyHunter.sdc
index e1813b4a..25ca3af5 100644
--- a/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/SpyHunter.sdc	
+++ b/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/SpyHunter.sdc	
@@ -88,11 +88,11 @@ set_input_delay -clock [get_clocks $sdram_clk] -reference_pin [get_ports {SDRAM_
 # Set Output Delay
 #**************************************************************
 
-set_output_delay -add_delay  -clock_fall -clock [get_clocks {SPI_SCK}] 1.000 [get_ports {SPI_DO}]
-set_output_delay -add_delay  -clock_fall -clock [get_clocks $sys_clk]  1.000 [get_ports {AUDIO_L}]
-set_output_delay -add_delay  -clock_fall -clock [get_clocks $sys_clk]  1.000 [get_ports {AUDIO_R}]
-set_output_delay -add_delay  -clock_fall -clock [get_clocks $sys_clk]  1.000 [get_ports {LED}]
-set_output_delay -add_delay  -clock_fall -clock [get_clocks $sys_clk]  1.000 [get_ports {VGA_*}]
+set_output_delay -clock [get_clocks {SPI_SCK}] 1.000 [get_ports {SPI_DO}]
+set_output_delay -clock [get_clocks $sys_clk]  1.000 [get_ports {AUDIO_L}]
+set_output_delay -clock [get_clocks $sys_clk]  1.000 [get_ports {AUDIO_R}]
+set_output_delay -clock [get_clocks $sys_clk]  1.000 [get_ports {LED}]
+set_output_delay -clock [get_clocks $sys_clk]  1.000 [get_ports {VGA_*}]
 
 set_output_delay -clock [get_clocks $sdram_clk] -reference_pin [get_ports {SDRAM_CLK}] -max 1.5 [get_ports {SDRAM_D* SDRAM_A* SDRAM_BA* SDRAM_n* SDRAM_CKE}]
 set_output_delay -clock [get_clocks $sdram_clk] -reference_pin [get_ports {SDRAM_CLK}] -min -0.8 [get_ports {SDRAM_D* SDRAM_A* SDRAM_BA* SDRAM_n* SDRAM_CKE}]
@@ -116,6 +116,9 @@ set_clock_groups -asynchronous -group [get_clocks {SPI_SCK}] -group [get_clocks
 set_multicycle_path -to {VGA_*[*]} -setup 2
 set_multicycle_path -to {VGA_*[*]} -hold 1
 
+set_multicycle_path -from [get_clocks $sys_clk] -to [get_clocks $sdram_clk] -setup 2
+set_multicycle_path -from [get_clocks $sys_clk] -to [get_clocks $sdram_clk] -hold 1
+
 #**************************************************************
 # Set Maximum Delay
 #**************************************************************

From bbd38ee214463434db2af9e36d765cdae07550e8 Mon Sep 17 00:00:00 2001
From: Gyorgy Szombathelyi <gyurco@freemail.hu>
Date: Sun, 20 Dec 2020 16:27:13 +0100
Subject: [PATCH 11/12] MiST: further update of common modules

---
 common/mist/data_io.v | 11 +++++++----
 common/mist/mist.vhd  |  2 +-
 common/mist/user_io.v | 11 ++++++++---
 3 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/common/mist/data_io.v b/common/mist/data_io.v
index 8ca99fcc..7e14f129 100644
--- a/common/mist/data_io.v
+++ b/common/mist/data_io.v
@@ -28,7 +28,7 @@ module data_io
 	input             SPI_SS2,
 	input             SPI_SS4,
 	input             SPI_DI,
-	inout reg         SPI_DO,
+	inout             SPI_DO,
 
 	input             clkref_n, // assert ioctl_wr one cycle after clkref stobe (negative active)
 
@@ -53,11 +53,13 @@ parameter ROM_DIRECT_UPLOAD = 0;
 
 reg  [7:0] data_w;
 reg  [7:0] data_w2  = 0;
+reg  [3:0] cnt;
 reg        rclk   = 0;
 reg        rclk2  = 0;
 reg        addr_reset = 0;
 reg        downloading_reg = 0;
 reg        uploading_reg = 0;
+reg        reg_do;
 
 localparam DIO_FILE_TX      = 8'h53;
 localparam DIO_FILE_TX_DAT  = 8'h54;
@@ -66,19 +68,20 @@ localparam DIO_FILE_INFO    = 8'h56;
 localparam DIO_FILE_RX      = 8'h57;
 localparam DIO_FILE_RX_DAT  = 8'h58;
 
+assign SPI_DO = reg_do;
+
 // data_io has its own SPI interface to the io controller
 always@(negedge SPI_SCK or posedge SPI_SS2) begin : SPI_TRANSMITTER
 	reg [7:0] dout_r;
 
 	if(SPI_SS2) begin
-		SPI_DO <= 1'bZ;
+		reg_do <= 1'bZ;
 	end else begin
 		if (cnt == 15) dout_r <= ioctl_din;
-		SPI_DO <= dout_r[~cnt[2:0]];
+		reg_do <= dout_r[~cnt[2:0]];
 	end
 end
 
-reg  [3:0] cnt;
 
 always@(posedge SPI_SCK, posedge SPI_SS2) begin : SPI_RECEIVER
 	reg  [6:0] sbuf;
diff --git a/common/mist/mist.vhd b/common/mist/mist.vhd
index 38fa2924..0dfa2860 100644
--- a/common/mist/mist.vhd
+++ b/common/mist/mist.vhd
@@ -30,7 +30,7 @@ port (
 	joystick_4        : out std_logic_vector(31 downto 0);
 	joystick_analog_0 : out std_logic_vector(15 downto 0);
 	joystick_analog_1 : out std_logic_vector(15 downto 0);
-	status            : out std_logic_vector(31 downto 0);
+	status            : out std_logic_vector(63 downto 0);
 	switches          : out std_logic_vector(1 downto 0);
 	buttons           : out std_logic_vector(1 downto 0);
 	scandoubler_disable : out std_logic;
diff --git a/common/mist/user_io.v b/common/mist/user_io.v
index 609f6d49..25cf9c4c 100644
--- a/common/mist/user_io.v
+++ b/common/mist/user_io.v
@@ -47,8 +47,11 @@ module user_io #(parameter STRLEN=0, parameter PS2DIV=100, parameter ROM_DIRECT_
 	output              scandoubler_disable,
 	output              ypbpr,
 	output              no_csync,
-	output reg   [31:0] status,
+	output reg   [63:0] status,
 	output reg    [6:0] core_mod, // core variant, sent before the config string is requested
+	// RTC data from IO controller
+	// sec, min, hour, date, month, year, day (BCD)
+	output reg   [63:0] rtc,
 
 	// connection to sd card emulation
 	input        [31:0] sd_lba,
@@ -497,12 +500,14 @@ always @(posedge clk_sys) begin : cmd_block
 
 				8'h15: status <= spi_byte_in;
 
-				// status, 32bit version
-				8'h1e: if(abyte_cnt<5) status[(abyte_cnt-1)<<3 +:8] <= spi_byte_in;
+				// status, 64bit version
+				8'h1e: if(abyte_cnt<9) status[(abyte_cnt-1)<<3 +:8] <= spi_byte_in;
 
 				// core variant
 				8'h21: core_mod <= spi_byte_in[6:0];
 
+				// RTC
+				8'h22: if(abyte_cnt<9) rtc[(abyte_cnt-1)<<3 +:8] <= spi_byte_in;
 			endcase
 		end
 	end

From 1855f122b9c9c09e1e6ca2edb9a626bcda978752 Mon Sep 17 00:00:00 2001
From: Gyorgy Szombathelyi <gyurco@freemail.hu>
Date: Sun, 20 Dec 2020 16:31:04 +0100
Subject: [PATCH 12/12] Save settings -> Save NVRAM

---
 Arcade_MiST/Midway MCR 2/MCR2/README.txt                     | 2 +-
 Arcade_MiST/Midway MCR 2/MCR2/rtl/MCR2_MiST.sv               | 2 +-
 Arcade_MiST/Midway MCR 3/README.txt                          | 2 +-
 Arcade_MiST/Midway MCR 3/rtl/MCR3_MiST.sv                    | 2 +-
 Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/README.txt      | 5 ++++-
 .../Midway MCR Scroll/SpyHunter_MiST/rtl/SpyHunter_MiST.sv   | 2 +-
 .../Defender Hardware/ReadMe.txt                             | 2 +-
 .../Defender Hardware/rtl/Defender_MiST.sv                   | 2 +-
 .../Williams 6809 rev.1 Hardware/Robotron Hardware/README.md | 2 +-
 .../Robotron Hardware/rtl/RobotronFPGA_MiST.sv               | 2 +-
 10 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/Arcade_MiST/Midway MCR 2/MCR2/README.txt b/Arcade_MiST/Midway MCR 2/MCR2/README.txt
index 291aa722..1c84ed26 100644
--- a/Arcade_MiST/Midway MCR 2/MCR2/README.txt	
+++ b/Arcade_MiST/Midway MCR 2/MCR2/README.txt	
@@ -18,7 +18,7 @@
 -- MRA utilty: https://github.com/sebdel/mra-tools-c
 --
 -- Some games are storing settings/high scores in a non-volatile RAM. It can be saved to
--- the SD Card with the "Save settings" option in the OSD menu. It'll be restored when
+-- the SD Card with the "Save NVRAM" option in the OSD menu. It'll be restored when
 -- the core is loaded next time.
 --
 ---------------------------------------------------------------------------------
diff --git a/Arcade_MiST/Midway MCR 2/MCR2/rtl/MCR2_MiST.sv b/Arcade_MiST/Midway MCR 2/MCR2/rtl/MCR2_MiST.sv
index 4d1de8f1..d6add4b2 100644
--- a/Arcade_MiST/Midway MCR 2/MCR2/rtl/MCR2_MiST.sv	
+++ b/Arcade_MiST/Midway MCR 2/MCR2/rtl/MCR2_MiST.sv	
@@ -59,7 +59,7 @@ localparam CONF_STR = {
 	"O4,Spinner speed,Low,High;",
 	"DIP;",
 	"O7,Service,Off,On;",
-	"R2048,Save settings;",
+	"R2048,Save NVRAM;",
 	"T0,Reset;",
 	"V,v2.0.",`BUILD_DATE
 };
diff --git a/Arcade_MiST/Midway MCR 3/README.txt b/Arcade_MiST/Midway MCR 3/README.txt
index 2fceb179..6fea4d30 100644
--- a/Arcade_MiST/Midway MCR 3/README.txt	
+++ b/Arcade_MiST/Midway MCR 3/README.txt	
@@ -72,7 +72,7 @@ Copy the ROM files to the root of the SD Card.
 MRA utilty: https://github.com/sebdel/mra-tools-c
 
 Some games are storing settings/high scores in a non-volatile RAM. It can be saved to
-the SD Card with the "Save settings" option in the OSD menu. It'll be restored when
+the SD Card with the "Save NVRAM" option in the OSD menu. It'll be restored when
 the core is loaded next time.
 
 Based on Darfpga's work:
diff --git a/Arcade_MiST/Midway MCR 3/rtl/MCR3_MiST.sv b/Arcade_MiST/Midway MCR 3/rtl/MCR3_MiST.sv
index 28a16022..e7b7061d 100644
--- a/Arcade_MiST/Midway MCR 3/rtl/MCR3_MiST.sv	
+++ b/Arcade_MiST/Midway MCR 3/rtl/MCR3_MiST.sv	
@@ -60,7 +60,7 @@ localparam CONF_STR = {
 	"O6,Swap Joystick,Off,On;",
 	"DIP;",
 	"O7,Service,Off,On;",
-	"R2048,Save settings;",
+	"R2048,Save NVRAM;",
 	"T0,Reset;",
 	"V,v1.1.",`BUILD_DATE
 };
diff --git a/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/README.txt b/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/README.txt
index a84f2a73..05bccbd0 100644
--- a/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/README.txt	
+++ b/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/README.txt	
@@ -23,7 +23,10 @@ C	SPACE		: Shift
 X	Z		: Oil
 Y	X		: Smoke
 
-
+-- The settings in the service mode can be preserved by choosing the "Save NVRAM"
+-- option in the OSD menu. It'll be saved to a .RAM file, and restored when the core
+-- is loaded.
+--
 ---------------------------------------------------------------------------------
 -- DE10_lite Top level for Spy hunter (Midway MCR) by Dar (darfpga@aol.fr) (06/12/2019)
 -- http://darfpga.blogspot.fr
diff --git a/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/rtl/SpyHunter_MiST.sv b/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/rtl/SpyHunter_MiST.sv
index ffb31fa7..b8f5518c 100644
--- a/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/rtl/SpyHunter_MiST.sv	
+++ b/Arcade_MiST/Midway MCR Scroll/SpyHunter_MiST/rtl/SpyHunter_MiST.sv	
@@ -55,7 +55,7 @@ localparam CONF_STR = {
 	"O6,Service,Off,On;",
 	"O8,Demo Sounds,Off,On;",
 	"O9,Show Lamps,Off,On;",
-	"R2048,Save settings;",
+	"R2048,Save NVRAM;",
 	"T0,Reset;",
 	"V,v1.1.",`BUILD_DATE
 };
diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/ReadMe.txt b/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/ReadMe.txt
index fc87758d..a2db5f0d 100644
--- a/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/ReadMe.txt	
+++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/ReadMe.txt	
@@ -14,7 +14,7 @@
 -- MRA utility: https://github.com/sebdel/mra-tools-c/
 --
 -- Defender stores its settings and the high score table in a non-volatile RAM.
--- It can be saved to the SD Card with the "Save settings" OSD option, and it'll
+-- It can be saved to the SD Card with the "Save NVRAM" OSD option, and it'll
 -- be restored next time the core is loaded.
 --
 ---------------------------------------------------------------------------------
diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/rtl/Defender_MiST.sv b/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/rtl/Defender_MiST.sv
index 7c103d67..8b25a995 100644
--- a/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/rtl/Defender_MiST.sv	
+++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/rtl/Defender_MiST.sv	
@@ -42,7 +42,7 @@ localparam CONF_STR = {
 	"O34,Scanlines,Off,25%,50%,75%;",
 	"O5,Blend,Off,On;",
 	"DIP;",
-	"R256,Save settings;",
+	"R256,Save NVRAM;",
 	"T0,Reset;",
 	"V,v1.2.",`BUILD_DATE
 };
diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/README.md b/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/README.md
index d8ba0ba7..a87f74e4 100644
--- a/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/README.md	
+++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/README.md	
@@ -20,7 +20,7 @@ Usage:
 Note: the MRA files contains a dump of the CMOS RAM. It will be included in the generated ROM file.
 Change it for permanent settings (search for the format online). It's possible to change these values
 inside the core, with turning on "Auto-up" switch, and activate the "Advance" trigger in the OSD. Then
-it's possible to save these settings and high scores into a RAM file via the "Save settings" OSD item.
+it's possible to save these settings and high scores into a RAM file via the "Save NVRAM" OSD item.
 Refer to the arcade's user manual for further info.
 
 
diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/rtl/RobotronFPGA_MiST.sv b/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/rtl/RobotronFPGA_MiST.sv
index bb34cf4c..799c6117 100644
--- a/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/rtl/RobotronFPGA_MiST.sv	
+++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Robotron Hardware/rtl/RobotronFPGA_MiST.sv	
@@ -49,7 +49,7 @@ localparam CONF_STR = {
 	"O6,Swap Joysticks,Off,On;",
 	"O7,Auto up,Off,On;",
 	"T8,Advance;",
-	"R1024,Save settings;",
+	"R1024,Save NVRAM;",
 	"T0,Reset;",
 	"V,v1.0.",`BUILD_DATE
 };