diff --git a/build.sh b/build.sh
index 196ab45..e630d35 100755
--- a/build.sh
+++ b/build.sh
@@ -90,9 +90,10 @@ build_fpga () {
     else
         if [ "$DEBUG_ENABLED" = true ]; then
             quartus_sh --set VERILOG_MACRO="DEBUG" ./SummerCart64.qpf
+        else
+            quartus_sh --set -remove VERILOG_MACRO="DEBUG" ./SummerCart64.qpf
         fi
         quartus_sh --flow compile ./SummerCart64.qpf
-        quartus_sh --set -remove VERILOG_MACRO="DEBUG" ./SummerCart64.qpf
     fi
     popd > /dev/null
 
diff --git a/fw/rtl/SummerCart64.sv b/fw/rtl/SummerCart64.sv
index cb164c7..4fa55c3 100644
--- a/fw/rtl/SummerCart64.sv
+++ b/fw/rtl/SummerCart64.sv
@@ -70,6 +70,8 @@ module SummerCart64 (
         .dd_interrupt(dd_interrupt)
     );
 
+    if_cpu_ram cpu_ram ();
+
     system system_inst (
         .sys(sys)
     );
@@ -89,6 +91,7 @@ module SummerCart64 (
         .si(si),
         .flash(flash),
         .dd(dd),
+        .cpu_ram(cpu_ram),
 
         .n64_pi_alel(i_n64_pi_alel),
         .n64_pi_aleh(i_n64_pi_aleh),
@@ -117,6 +120,7 @@ module SummerCart64 (
         .si(si),
         .flash(flash),
         .dd(dd),
+        .cpu_ram(cpu_ram),
 
         .gpio_o(gpio_o),
         .gpio_i(gpio_i),
diff --git a/fw/rtl/cpu/cpu_ram.sv b/fw/rtl/cpu/cpu_ram.sv
index fae5dd9..62c7af7 100644
--- a/fw/rtl/cpu/cpu_ram.sv
+++ b/fw/rtl/cpu/cpu_ram.sv
@@ -1,10 +1,36 @@
+interface if_cpu_ram ();
+
+    logic write;
+    logic [12:0] address;
+    logic [15:0] rdata;
+    logic [15:0] wdata;
+
+    modport cpu (
+        input write,
+        input address,
+        output rdata,
+        input wdata
+    );
+
+    modport external (
+        output write,
+        output address,
+        input rdata,
+        output wdata
+    );
+
+endinterface
+
+
 module cpu_ram (
     if_system.sys sys,
-    if_cpu_bus bus
+    if_cpu_bus bus,
+    if_cpu_ram.cpu cpu_ram
 );
 
     logic [3:0][7:0] ram [0:4095];
-    logic [31:0] q;
+    logic [31:0] q_cpu;
+    logic [31:0] q_external;
 
     always_ff @(posedge sys.clk) begin
         bus.ack <= 1'b0;
@@ -14,14 +40,15 @@ module cpu_ram (
     end
 
     always_comb begin
+        cpu_ram.rdata = cpu_ram.address[0] ? q_external[31:16] : q_external[15:0];
         bus.rdata = 32'd0;
         if (bus.ack) begin
-            bus.rdata = q;
+            bus.rdata = q_cpu;
         end
     end
 
-    always_ff @(posedge sys.clk) begin        
-        q <= ram[bus.address[13:2]];
+    always_ff @(posedge sys.clk) begin
+        q_cpu <= ram[bus.address[13:2]];
         if (bus.request) begin
             if (bus.wmask[0]) ram[bus.address[13:2]][0] <= bus.wdata[7:0];
             if (bus.wmask[1]) ram[bus.address[13:2]][1] <= bus.wdata[15:8];
@@ -30,4 +57,17 @@ module cpu_ram (
         end
     end
 
+    always_ff @(posedge sys.clk) begin
+        q_external <= ram[cpu_ram.address[12:1]];
+        if (cpu_ram.write) begin
+            if (cpu_ram.address[0]) begin
+                ram[cpu_ram.address[12:1]][2] <= cpu_ram.wdata[7:0];
+                ram[cpu_ram.address[12:1]][3] <= cpu_ram.wdata[15:8];
+            end else begin
+                ram[cpu_ram.address[12:1]][0] <= cpu_ram.wdata[7:0];
+                ram[cpu_ram.address[12:1]][1] <= cpu_ram.wdata[15:8];
+            end
+        end
+    end
+
 endmodule
diff --git a/fw/rtl/cpu/cpu_soc.sv b/fw/rtl/cpu/cpu_soc.sv
index 7a15039..95e5053 100644
--- a/fw/rtl/cpu/cpu_soc.sv
+++ b/fw/rtl/cpu/cpu_soc.sv
@@ -7,6 +7,7 @@ module cpu_soc (
     if_si.cpu si,
     if_flash.cpu flash,
     if_dd.cpu dd,
+    if_cpu_ram.cpu cpu_ram,
 
     input [7:0] gpio_i,
     output [7:0] gpio_o,
@@ -38,7 +39,8 @@ module cpu_soc (
 
     cpu_ram cpu_ram_inst (
         .sys(sys),
-        .bus(bus.at[sc64::ID_CPU_RAM].device)
+        .bus(bus.at[sc64::ID_CPU_RAM].device),
+        .cpu_ram(cpu_ram)
     );
 
     cpu_flash cpu_flash_inst (
diff --git a/fw/rtl/n64/n64_cfg.sv b/fw/rtl/n64/n64_cfg.sv
index 486d343..b26e970 100644
--- a/fw/rtl/n64/n64_cfg.sv
+++ b/fw/rtl/n64/n64_cfg.sv
@@ -1,7 +1,8 @@
 module n64_cfg (
     if_system sys,
     if_n64_bus bus,
-    if_config.n64 cfg
+    if_config.n64 cfg,
+    if_cpu_ram.external cpu_ram
 );
 
     typedef enum bit [3:0] { 
@@ -23,24 +24,32 @@ module n64_cfg (
     e_state state;
 
     always_comb begin
+        cpu_ram.write = bus.request && bus.write && bus.address[14];
+        cpu_ram.address = bus.address[13:1];
+        cpu_ram.wdata = {bus.wdata[7:0], bus.wdata[15:8]};
+
         bus.rdata = 16'd0;
         if (bus.ack) begin
-            case (bus.address[3:1])
-                R_SR: bus.rdata = {
-                    cfg.cpu_ready,
-                    cfg.cpu_busy,
-                    1'b0,
-                    cfg.cmd_error,
-                    12'd0
-                };
-                R_COMMAND: bus.rdata = {8'd0, cfg.cmd};
-                R_DATA_0_H: bus.rdata = cfg.data[0][31:16];
-                R_DATA_0_L: bus.rdata = cfg.data[0][15:0];
-                R_DATA_1_H: bus.rdata = cfg.data[1][31:16];
-                R_DATA_1_L: bus.rdata = cfg.data[1][15:0];
-                R_VERSION_H: bus.rdata = sc64::SC64_VER[31:16];
-                R_VERSION_L: bus.rdata = sc64::SC64_VER[15:0];
-            endcase
+            if (bus.address[14]) begin
+                bus.rdata = {cpu_ram.rdata[7:0], cpu_ram.rdata[15:8]};
+            end else if (!(&bus.address[13:4])) begin
+                case (bus.address[3:1])
+                    R_SR: bus.rdata = {
+                        cfg.cpu_ready,
+                        cfg.cpu_busy,
+                        1'b0,
+                        cfg.cmd_error,
+                        12'd0
+                    };
+                    R_COMMAND: bus.rdata = {8'd0, cfg.cmd};
+                    R_DATA_0_H: bus.rdata = cfg.data[0][31:16];
+                    R_DATA_0_L: bus.rdata = cfg.data[0][15:0];
+                    R_DATA_1_H: bus.rdata = cfg.data[1][31:16];
+                    R_DATA_1_L: bus.rdata = cfg.data[1][15:0];
+                    R_VERSION_H: bus.rdata = sc64::SC64_VER[31:16];
+                    R_VERSION_L: bus.rdata = sc64::SC64_VER[15:0];
+                endcase
+            end
         end
     end
 
@@ -59,7 +68,7 @@ module n64_cfg (
                     if (bus.request) begin
                         state <= S_WAIT;
                         bus.ack <= 1'b1;
-                        if (bus.write) begin
+                        if (bus.write && (!(&bus.address[14:4]))) begin
                             case (bus.address[3:1])
                                 R_COMMAND: begin
                                     cfg.cmd <= bus.wdata[7:0];
diff --git a/fw/rtl/n64/n64_pi.sv b/fw/rtl/n64/n64_pi.sv
index 239628c..407e9e7 100644
--- a/fw/rtl/n64/n64_pi.sv
+++ b/fw/rtl/n64/n64_pi.sv
@@ -282,11 +282,6 @@ module n64_pi (
                     n64_pi_address_valid <= 1'b0;
                 end
             end
-            if (cfg_selected) begin
-                if (|n64_pi_ad_input[15:4]) begin
-                    n64_pi_address_valid <= 1'b0;
-                end
-            end
         end
     end
 
diff --git a/fw/rtl/n64/n64_soc.sv b/fw/rtl/n64/n64_soc.sv
index 2f1a1a4..722ce28 100644
--- a/fw/rtl/n64/n64_soc.sv
+++ b/fw/rtl/n64/n64_soc.sv
@@ -7,6 +7,7 @@ module n64_soc (
     if_si.si si,
     if_flash.memory flash,
     if_dd dd,
+    if_cpu_ram.external cpu_ram,
 
     input n64_pi_alel,
     input n64_pi_aleh,
@@ -90,7 +91,8 @@ module n64_soc (
     n64_cfg n64_cfg_inst (
         .sys(sys),
         .bus(bus.at[sc64::ID_N64_CFG].device),
-        .cfg(cfg)
+        .cfg(cfg),
+        .cpu_ram(cpu_ram)
     );
 
 endmodule
diff --git a/sw/n64/src/exception.c b/sw/n64/src/exception.c
index 09e6324..b5114ea 100644
--- a/sw/n64/src/exception.c
+++ b/sw/n64/src/exception.c
@@ -113,7 +113,7 @@ static const vi_regs_t vi_config[] = {{
     .V_INTR = 0x000003FF,
     .CURR_LINE = 0x00000000,
     .TIMING = 0x03E52239,
-    .V_SYNC = 0x0000020D,
+    .V_SYNC = 0x0000020C,
     .H_SYNC = 0x00000C15,
     .H_SYNC_LEAP = 0x0C150C15,
     .H_LIMITS = 0x006C02EC,
diff --git a/sw/n64/src/io.h b/sw/n64/src/io.h
index 94d7818..e6897cf 100644
--- a/sw/n64/src/io.h
+++ b/sw/n64/src/io.h
@@ -229,6 +229,9 @@ typedef struct {
     io32_t SR_CMD;
     io32_t DATA[2];
     io32_t VERSION;
+    io32_t __padding[4092];
+    io32_t CPU_RAM[3840];
+    io32_t BUFFER[256];
 } sc64_regs_t;
 
 #define SC64_BASE                   (0x1FFF0000UL)
diff --git a/sw/n64/src/sc64.c b/sw/n64/src/sc64.c
index a065784..c82589b 100644
--- a/sw/n64/src/sc64.c
+++ b/sw/n64/src/sc64.c
@@ -35,179 +35,40 @@ bool sc64_perform_cmd (uint8_t cmd, uint32_t *args, uint32_t *result) {
     return error;
 }
 
-uint32_t sc64_get_config (cfg_id_t id) {
+uint32_t sc64_query_config (cfg_id_t id) {
     uint32_t args[2] = { id, 0 };
     uint32_t result[2];
     sc64_perform_cmd(SC64_CMD_QUERY, args, result);
     return result[1];
 }
 
-void sc64_set_config (cfg_id_t id, uint32_t value) {
+void sc64_change_config (cfg_id_t id, uint32_t value) {
     uint32_t args[2] = { id, value };
     sc64_perform_cmd(SC64_CMD_CONFIG, args, NULL);
 }
 
 void sc64_get_info (sc64_info_t *info) {
-    // info->dd_enabled = (bool) sc64_get_config(CFG_ID_DD_ENABLE);
-    // info->is_viewer_enabled = (bool) sc64_get_config(CFG_ID_IS_VIEWER_ENABLE);
-    // info->save_type = (save_type_t) sc64_get_config(CFG_ID_SAVE_TYPE);
-    info->cic_seed = (uint16_t) sc64_get_config(CFG_ID_CIC_SEED);
-    info->tv_type = (tv_type_t) sc64_get_config(CFG_ID_TV_TYPE);
-    // info->save_location = (io32_t *) (0x10000000 | sc64_get_config(CFG_ID_SAVE_OFFEST));
-    // info->ddipl_location = (io32_t *) (0x10000000 | sc64_get_config(CFG_ID_DDIPL_OFFEST));
-    info->boot_mode = (boot_mode_t) sc64_get_config(CFG_ID_BOOT_MODE);
+    info->cic_seed = (uint16_t) sc64_query_config(CFG_ID_CIC_SEED);
+    info->tv_type = (tv_type_t) sc64_query_config(CFG_ID_TV_TYPE);
+    info->boot_mode = (boot_mode_t) sc64_query_config(CFG_ID_BOOT_MODE);
 }
 
-// void sc64_wait_usb_rx_ready (uint32_t *type, uint32_t *length) {
-//     uint32_t result[2];
-//     do {
-//         sc64_perform_cmd(SC64_CMD_DEBUG_RX_READY, NULL, result);
-//     } while (result[0] == 0 && result[1] == 0);
-//     *type = result[0];
-//     *length = result[1];
-// }
-
-// void sc64_wait_usb_rx_busy (void) {
-//     uint32_t result[2];
-//     do {
-//         sc64_perform_cmd(SC64_CMD_DEBUG_RX_BUSY, NULL, result);
-//     } while (result[0]);
-// }
-
-// void sc64_usb_rx_data (io32_t *address, uint32_t length) {
-//     uint32_t args[2] = { (uint32_t) (address), ALIGN(length, 2) };
-//     sc64_perform_cmd(SC64_CMD_DEBUG_RX_DATA, args, NULL);
-// }
-
-// void sc64_wait_usb_tx_ready (void) {
-//     uint32_t result[2];
-//     do {
-//         sc64_perform_cmd(SC64_CMD_DEBUG_TX_READY, NULL, result);
-//     } while (!result[0]);
-// }
-
-// void sc64_usb_tx_data (io32_t *address, uint32_t length) {
-//     uint32_t args[2] = { (uint32_t) (address), ALIGN(length, 2) };
-//     sc64_perform_cmd(SC64_CMD_DEBUG_TX_DATA, args, NULL);
-// }
-
-// void sc64_debug_write (uint8_t type, const void *data, uint32_t len) {
-//     char *dma = "DMA@";
-//     char *cmp = "CMPH";
-
-//     io32_t *sdram = (io32_t *) (SC64_DEBUG_WRITE_ADDRESS);
-
-//     uint8_t *src = (uint8_t *) (data);
-//     uint32_t tmp;
-//     io32_t *dst = sdram;
-
-//     uint32_t copy_length = ALIGN(len, 4);
-
-//     sc64_wait_usb_tx_ready();
-
-//     bool writable = sc64_get_config(CFG_ID_SDRAM_WRITABLE);
-//     bool sdram_switched = sc64_get_config(CFG_ID_SDRAM_SWITCH);
-
-//     if (!writable) {
-//         sc64_set_config(CFG_ID_SDRAM_WRITABLE, true);
-//     }
-//     if (!sdram_switched) {
-//         sc64_set_config(CFG_ID_SDRAM_SWITCH, true);
-//     }
-
-//     pi_io_write(dst++, *((uint32_t *) (dma)));
-//     pi_io_write(dst++, (type << 24) | len);
-
-//     while (src < ((uint8_t *) (data + copy_length))) {
-//         tmp = ((*src++) << 24);
-//         tmp |= ((*src++) << 16);
-//         tmp |= ((*src++) << 8);
-//         tmp |= ((*src++) << 0);
-//         pi_io_write(dst++, tmp);
-//         if (dst >= (io32_t *) ((void *) (sdram) + SC64_DEBUG_MAX_SIZE)) {
-//             sc64_usb_tx_data(sdram, (dst - sdram) * sizeof(uint32_t));
-//             sc64_wait_usb_tx_ready();
-//             dst = sdram;
-//         }
-//     }
-
-//     pi_io_write(dst++, *((uint32_t *) (cmp)));
-
-//     if (!writable) {
-//         sc64_set_config(CFG_ID_SDRAM_WRITABLE, false);
-//     }
-//     if (!sdram_switched) {
-//         sc64_set_config(CFG_ID_SDRAM_SWITCH, false);
-//     }
-
-//     sc64_usb_tx_data(sdram, (dst - sdram) * sizeof(uint32_t));
-// }
-
-// void sc64_debug_fsd_read (const void *data, uint32_t sector, uint32_t count) {
-//     uint32_t type;
-//     uint32_t length;
-
-//     io32_t *sdram = (io32_t *) (SC64_DEBUG_READ_ADDRESS);
-
-//     io32_t *src = sdram;
-//     uint32_t tmp;
-//     uint8_t *dst = (uint8_t *) (data);
-
-//     uint32_t read_length = count * 512;
-
-//     sc64_debug_write(SC64_DEBUG_ID_FSD_SECTOR, &sector, 4);
-//     sc64_debug_write(SC64_DEBUG_ID_FSD_READ, &read_length, 4);
-//     sc64_wait_usb_rx_ready(&type, &length);
-//     sc64_usb_rx_data(sdram, length);
-//     sc64_wait_usb_rx_busy();
-
-//     uint32_t copy_length = ALIGN(length, 4);
-
-//     bool sdram_switched = sc64_get_config(CFG_ID_SDRAM_SWITCH);
-
-//     if (!sdram_switched) {
-//         sc64_set_config(CFG_ID_SDRAM_SWITCH, true);
-//     }
-
-//     for (int i = 0; i < copy_length; i += 4) {
-//         tmp = pi_io_read(src++);
-//         *dst++ = (tmp >> 24);
-//         *dst++ = (tmp >> 16);
-//         *dst++ = (tmp >> 8);
-//         *dst++ = (tmp & 0xFF);
-//     }
-
-//     if (!sdram_switched) {
-//         sc64_set_config(CFG_ID_SDRAM_SWITCH, false);
-//     }
-// }
-
-// void sc64_debug_fsd_write (const void *data, uint32_t sector, uint32_t count) {
-//     sc64_debug_write(SC64_DEBUG_ID_FSD_SECTOR, &sector, 4);
-//     sc64_debug_write(SC64_DEBUG_ID_FSD_WRITE, data, count * 512);
-// }
-
-// void sc64_init_is_viewer (void) {
-//     sc64_set_config(CFG_ID_SDRAM_WRITABLE, true);
-//     pi_io_write(&ISV->ID, 0);
-// }
-
-sc64_storage_error_t sc64_storage_read(sc64_storage_type_t storage_type, const void *buff, uint32_t sector, uint32_t count) {
-    return SC64_STORAGE_ERROR;
+void sc64_uart_put_char (char c) {
+#ifdef DEBUG
+    uint32_t args[2] = { (uint32_t) (c), 0 };
+    sc64_perform_cmd(SC64_CMD_UART_PUT, args, NULL);
+#endif
 }
 
 void sc64_uart_print_string (const char *text) {
-#ifdef DEBUG
-    uint32_t args[2] = { 0, 0 };
     while (*text != '\0') {
-        args[0] = (uint32_t) (*text++);
-        sc64_perform_cmd(SC64_CMD_UART_PUT, args, NULL);
+        sc64_uart_put_char (*text++);
     }
-#endif
 }
 
 void sc64_init (void) {
     while (!sc64_check_presence());
     sc64_wait_cpu_ready();
-    sc64_set_config(CFG_ID_SDRAM_SWITCH, true);
+    sc64_change_config(CFG_ID_SDRAM_SWITCH, true);
+    sc64_uart_print_string("\033c");
 }
diff --git a/sw/n64/src/sc64.h b/sw/n64/src/sc64.h
index 1b9e1f9..7bb17f7 100644
--- a/sw/n64/src/sc64.h
+++ b/sw/n64/src/sc64.h
@@ -4,30 +4,15 @@
 
 #include <stdbool.h>
 #include <stdint.h>
-// #include <stdio.h>
 #include "io.h"
 
 
-#define SC64_CMD_CONFIG             ('C')
 #define SC64_CMD_QUERY              ('Q')
-// #define SC64_CMD_DEBUG_RX_DATA      ('E')
-// #define SC64_CMD_DEBUG_RX_READY     ('A')
-// #define SC64_CMD_DEBUG_RX_BUSY      ('F')
-// #define SC64_CMD_DEBUG_TX_DATA      ('D')
-// #define SC64_CMD_DEBUG_TX_READY     ('S')
+#define SC64_CMD_CONFIG             ('C')
 #define SC64_CMD_UART_PUT           ('Z')
 
 #define SC64_VERSION_2              (0x53437632)
 
-// #define SC64_DEBUG_WRITE_ADDRESS    (0x13FF8000UL)
-// #define SC64_DEBUG_READ_ADDRESS     (0x13FF0000UL)
-// #define SC64_DEBUG_MAX_SIZE         (32 * 1024)
-
-// #define SC64_DEBUG_ID_TEXT          (0x01)
-// #define SC64_DEBUG_ID_FSD_READ      (0xF1)
-// #define SC64_DEBUG_ID_FSD_WRITE     (0xF2)
-// #define SC64_DEBUG_ID_FSD_SECTOR    (0xF3)
-
 
 typedef enum {
     CFG_ID_SCR,
@@ -50,15 +35,19 @@ typedef enum {
     CFG_ID_IS_VIEWER_ENABLE,
 } cfg_id_t;
 
-// typedef enum {
-//     SAVE_TYPE_NONE = 0,
-//     SAVE_TYPE_EEPROM_4K = 1,
-//     SAVE_TYPE_EEPROM_16K = 2,
-//     SAVE_TYPE_SRAM = 3,
-//     SAVE_TYPE_FLASHRAM = 4,
-//     SAVE_TYPE_SRAM_BANKED = 5,
-//     SAVE_TYPE_FLASHRAM_PKST2 = 6,
-// } save_type_t;
+typedef enum {
+    SAVE_TYPE_NONE = 0,
+    SAVE_TYPE_EEPROM_4K = 1,
+    SAVE_TYPE_EEPROM_16K = 2,
+    SAVE_TYPE_SRAM = 3,
+    SAVE_TYPE_FLASHRAM = 4,
+    SAVE_TYPE_SRAM_BANKED = 5,
+    SAVE_TYPE_FLASHRAM_PKST2 = 6,
+} save_type_t;
+
+typedef enum {
+    CIC_SEED_UNKNOWN = 0xFFFF,
+} cic_seed_t;
 
 typedef enum {
     TV_TYPE_PAL = 0,
@@ -67,10 +56,6 @@ typedef enum {
     TV_TYPE_UNKNOWN = 3,
 } tv_type_t;
 
-typedef enum {
-    CIC_SEED_UNKNOWN = 0xFFFF,
-} cic_seed_t;
-
 typedef enum {
     BOOT_MODE_MENU_SD = 0,
     BOOT_MODE_MENU_USB = 1,
@@ -80,46 +65,21 @@ typedef enum {
 } boot_mode_t;
 
 typedef struct {
-    // bool dd_enabled;
-    // bool is_viewer_enabled;
-    // save_type_t save_type;
     boot_mode_t boot_mode;
     uint16_t cic_seed;
     tv_type_t tv_type;
-    // io32_t *save_location;
-    // io32_t *ddipl_location;
 } sc64_info_t;
 
 
-typedef enum {
-    SC64_STORAGE_TYPE_SD,
-    SC64_STORAGE_TYPE_USB,
-} sc64_storage_type_t;
-
-typedef enum {
-    SC64_STORAGE_OK,
-    SC64_STORAGE_ERROR,
-} sc64_storage_error_t;
-
-
 bool sc64_check_presence (void);
 void sc64_wait_cpu_ready (void);
 bool sc64_wait_cpu_busy (void);
 bool sc64_perform_cmd (uint8_t cmd, uint32_t *args, uint32_t *result);
-uint32_t sc64_get_config (cfg_id_t id);
-void sc64_set_config (cfg_id_t id, uint32_t value);
+uint32_t sc64_query_config (cfg_id_t id);
+void sc64_change_config (cfg_id_t id, uint32_t value);
 void sc64_get_info (sc64_info_t *info);
-// void sc64_wait_usb_rx_ready (uint32_t *type, uint32_t *length);
-// void sc64_wait_usb_rx_busy (void);
-// void sc64_usb_rx_data (io32_t *address, uint32_t length);
-// void sc64_wait_usb_tx_ready (void);
-// void sc64_usb_tx_data (io32_t *address, uint32_t length);
-// void sc64_debug_write (uint8_t type, const void *data, uint32_t len);
-// void sc64_debug_fsd_read (const void *data, uint32_t sector, uint32_t count);
-// void sc64_debug_fsd_write (const void *data, uint32_t sector, uint32_t count);
-// void sc64_init_is_viewer (void);
+void sc64_uart_put_char (char c);
 void sc64_uart_print_string (const char *text);
-sc64_storage_error_t sc64_storage_read(sc64_storage_type_t storage_type, const void *buff, uint32_t sector, uint32_t count);
 void sc64_init (void);
 
 
diff --git a/sw/riscv/SC64.ld b/sw/riscv/SC64.ld
index 8b3874a..69d4601 100644
--- a/sw/riscv/SC64.ld
+++ b/sw/riscv/SC64.ld
@@ -1,5 +1,6 @@
 MEMORY {
-    ram (rwx)   : org = 0x00000000, len = 16k
+    ram (rwx)   : org = 0x00000000, len = 15k
+    buffer (rw) : org = 0x00003C00, len = 1k
     rom (rx)    : org = 0x10010000, len = 26k
 }
 
@@ -44,6 +45,10 @@ SECTIONS {
         _ebss = .;
     } > ram
 
+    .buffer : {
+        *(.buffer)
+    } > buffer
+
     __global_pointer$ = MIN(_ssdata + 0x800, MAX(_sdata + 0x800, _ebss - 0x800));
     __stack_pointer$ = ORIGIN(ram) + LENGTH(ram);
 }
diff --git a/sw/riscv/src/cfg.c b/sw/riscv/src/cfg.c
index 19a11ec..ce65b07 100644
--- a/sw/riscv/src/cfg.c
+++ b/sw/riscv/src/cfg.c
@@ -247,7 +247,7 @@ void cfg_init (void) {
     set_save_type(SAVE_TYPE_NONE);
 
     CFG->DDIPL_OFFSET = DEFAULT_DDIPL_OFFSET;
-    CFG->SCR = CFG_SCR_CPU_READY | CFG_SCR_SDRAM_SWITCH;
+    CFG->SCR = CFG_SCR_CPU_READY;
 
     p.cic_seed = 0xFFFF;
     p.tv_type = 0x03;