diff --git a/fw/rtl/n64/n64_cfg.sv b/fw/rtl/n64/n64_cfg.sv
index 7a09b33..e5b4212 100644
--- a/fw/rtl/n64/n64_cfg.sv
+++ b/fw/rtl/n64/n64_cfg.sv
@@ -83,7 +83,7 @@ module n64_cfg (
                     REG_DATA_0_L: n64_scb.cfg_rdata[0][15:0] <= reg_bus.wdata;
                     REG_DATA_1_H: n64_scb.cfg_rdata[1][31:16] <= reg_bus.wdata;
                     REG_DATA_1_L: n64_scb.cfg_rdata[1][15:0] <= reg_bus.wdata;
-                    REG_VERSION_L: irq <= 1'b0;
+                    REG_VERSION_H: irq <= 1'b0;
                     REG_KEY_H, REG_KEY_L: begin
                         lock_sequence_counter <= lock_sequence_counter + 1'd1;
                         if (reg_bus.wdata != 16'hFFFF) begin
diff --git a/sw/controller/src/button.c b/sw/controller/src/button.c
index d9aa294..1c10b30 100644
--- a/sw/controller/src/button.c
+++ b/sw/controller/src/button.c
@@ -5,8 +5,12 @@
 #include "usb.h"
 
 
+#define BUTTON_COUNTER_TRIGGER_ON   (64)
+#define BUTTON_COUNTER_TRIGGER_OFF  (0)
+
+
 struct process {
-    uint32_t shift;
+    uint8_t counter;
     bool state;
     button_mode_t mode;
     bool trigger;
@@ -36,7 +40,7 @@ button_mode_t button_get_mode (void) {
 }
 
 void button_init (void) {
-    p.shift = 0x00000000UL;
+    p.counter = 0;
     p.state = false;
     p.mode = BUTTON_MODE_NONE;
     p.trigger = false;
@@ -45,15 +49,20 @@ void button_init (void) {
 void button_process (void) {
     usb_tx_info_t packet_info;
     uint32_t status = fpga_reg_get(REG_CFG_SCR);
-    p.shift <<= 1;
     if (status & CFG_SCR_BUTTON_STATE) {
-        p.shift |= (1 << 0);
+        if (p.counter < BUTTON_COUNTER_TRIGGER_ON) {
+            p.counter += 1;
+        }
+    } else {
+        if (p.counter > BUTTON_COUNTER_TRIGGER_OFF) {
+            p.counter -= 1;
+        }
     }
-    if (!p.state && p.shift == 0xFFFFFFFFUL) {
+    if (!p.state && p.counter == BUTTON_COUNTER_TRIGGER_ON) {
         p.state = true;
         p.trigger = true;
     }
-    if (p.state && p.shift == 0x00000000UL) {
+    if (p.state && p.counter == BUTTON_COUNTER_TRIGGER_OFF) {
         p.state = false;
     }
     if (p.trigger) {
diff --git a/sw/controller/src/cic.c b/sw/controller/src/cic.c
index 081021d..19e9ead 100644
--- a/sw/controller/src/cic.c
+++ b/sw/controller/src/cic.c
@@ -312,7 +312,7 @@ void cic_reset_parameters (void) {
 }
 
 void cic_set_parameters (uint32_t *args) {
-    cic_disabled = (args[0 >> 24]) & (1 << 1);
+    cic_disabled = (args[0] >> 24) & (1 << 1);
     cic_dd_mode = (args[0] >> 24) & (1 << 0);
     cic_seed = (args[0] >> 16) & 0xFF;
     cic_checksum[0] = (args[0] >> 8) & 0xFF;
@@ -350,7 +350,7 @@ void cic_task (void) {
     cic_write_checksum();
     cic_init_ram(region);
 
-    while(1) {
+    while (1) {
         uint8_t cmd = 0;
         cmd |= (cic_read() << 1);
         cmd |= cic_read();
diff --git a/sw/controller/src/flashram.c b/sw/controller/src/flashram.c
index 78c9e3f..21ccab4 100644
--- a/sw/controller/src/flashram.c
+++ b/sw/controller/src/flashram.c
@@ -44,8 +44,8 @@ void flashram_process (void) {
     uint8_t buffer[FLASHRAM_PAGE_SIZE];
     uint32_t address = FLASHRAM_ADDRESS;
     uint32_t erase_size = (op == OP_ERASE_SECTOR) ? FLASHRAM_SECTOR_SIZE : FLASHRAM_SIZE;
-    uint32_t sector = (op != OP_ERASE_ALL) ? ((scr & FLASHRAM_SCR_PAGE_MASK) >> FLASHRAM_SCR_PAGE_BIT) : 0;
-    address += sector * FLASHRAM_PAGE_SIZE;
+    uint32_t page = (op != OP_ERASE_ALL) ? ((scr & FLASHRAM_SCR_PAGE_MASK) >> FLASHRAM_SCR_PAGE_BIT) : 0;
+    address += page * FLASHRAM_PAGE_SIZE;
 
     switch (op) {
         case OP_ERASE_ALL:
diff --git a/sw/controller/src/led.c b/sw/controller/src/led.c
index a93b3f9..93f56c6 100644
--- a/sw/controller/src/led.c
+++ b/sw/controller/src/led.c
@@ -4,90 +4,86 @@
 #include "task.h"
 
 
-#define LED_TICKRATE_MS         (10)
-#define LED_CYCLE_TICKS_PERIOD  (10)
-#define LED_CYCLE_TICKS_ON      (3)
+#define LED_MS_PER_TICK         (10)
+#define LED_ERROR_TICKS_PERIOD  (50)
+#define LED_ERROR_TICKS_ON      (25)
+#define LED_ACT_TICKS_PERIOD    (15)
+#define LED_ACT_TICKS_ON        (6)
 
 
-typedef enum {
-    ON,
-    OFF
-} led_state_e;
-
-typedef struct {
-    uint32_t timer;
-    led_state_e state;
-} error_cycle_t;
-
-
-static uint32_t timer = 0;
-static uint8_t error_cycle = 0;
-static uint32_t current_act_counter = 0;
-static volatile uint32_t next_act_counter = 0;
+static bool error_mode = false;
+static uint32_t error_timer = 0;
 static volatile bool cic_error = false;
 static volatile bool rtc_error = false;
-static const error_cycle_t error_codes[2][8] = {
-    { { 50, ON }, { 50, OFF }, { 5, ON }, { 0, OFF }, { 0, OFF }, { 0, OFF }, { 0, OFF }, { 100, OFF } },
-    { { 50, ON }, { 50, OFF }, { 5, ON }, { 20, OFF }, { 5, ON }, { 0, OFF }, { 0, OFF }, { 100, OFF } },
-};
+
+static uint32_t act_timer = 0;
+static uint32_t current_act_counter = 0;
+static volatile uint32_t next_act_counter = 0;
 
 
 static void led_task_resume (void) {
     task_set_ready(TASK_ID_LED);
 }
 
-static bool led_has_errors (void) {
-    return (cic_error | rtc_error);
-}
-
-static void led_process_act (void) {
-    if (timer > 0) {
-        timer -= 1;
-        uint32_t cycle = ((LED_CYCLE_TICKS_PERIOD - 1) - (timer % LED_CYCLE_TICKS_PERIOD));
-        if (cycle < LED_CYCLE_TICKS_ON) {
-            hw_gpio_set(GPIO_ID_LED);
-        } else {
-            hw_gpio_reset(GPIO_ID_LED);
+static void led_update_error_mode (void) {
+    if (error_mode) {
+        if (!(cic_error || rtc_error)) {
+            error_mode = false;
+            act_timer = 0;
         }
     } else {
-        if (current_act_counter != next_act_counter) {
-            current_act_counter = next_act_counter;
-            timer = LED_CYCLE_TICKS_PERIOD;
-        } else {
-            hw_gpio_reset(GPIO_ID_LED);
+        if (cic_error || rtc_error) {
+            error_mode = true;
+            error_timer = 0;
         }
     }
 }
 
 static void led_process_errors (void) {
-    if (timer > 0) {
-        timer -= 1;
-    } else {
-        uint8_t error_code = 0;
+    if (error_timer == 0) {
+        error_timer = LED_ERROR_TICKS_PERIOD;
         if (cic_error) {
-            error_code = 0;
+            error_timer *= 1;
         } else if (rtc_error) {
-            error_code = 1;
+            error_timer *= 2;
         }
-        error_cycle_t error = error_codes[error_code][error_cycle];
-        timer = error.timer;
-        if (error.state == ON) {
-            hw_gpio_set(GPIO_ID_LED);
-        } else {
-            hw_gpio_reset(GPIO_ID_LED);
-        }
-        error_cycle += 1;
-        if (error_cycle >= 8) {
-            error_cycle = 0;
+        error_timer += LED_ERROR_TICKS_PERIOD;
+    }
+
+    if (error_timer > 0) {
+        error_timer -= 1;
+        if (error_timer >= LED_ERROR_TICKS_PERIOD) {
+            uint32_t error_cycle = (error_timer % LED_ERROR_TICKS_PERIOD);
+            if (error_cycle == LED_ERROR_TICKS_ON) {
+                hw_gpio_set(GPIO_ID_LED);
+            }
+            if (error_cycle == 0) {
+                hw_gpio_reset(GPIO_ID_LED);
+            }
         }
     }
 }
 
+static void led_process_act (void) {
+    if (act_timer == 0) {
+        if (current_act_counter != next_act_counter) {
+            current_act_counter = next_act_counter;
+            act_timer = LED_ACT_TICKS_PERIOD;
+        }
+    }
 
-void led_blink_act (void) {
-    next_act_counter += 1;
+    if (act_timer > 0) {
+        act_timer -= 1;
+        if (act_timer == LED_ACT_TICKS_ON) {
+            hw_gpio_set(GPIO_ID_LED);
+        }
+        if (act_timer == 0) {
+            hw_gpio_reset(GPIO_ID_LED);
+        }
+    }
 }
 
+
 void led_blink_error (led_error_t error) {
     switch (error) {
         case LED_ERROR_CIC:
@@ -110,14 +106,19 @@ void led_clear_error (led_error_t error) {
     }
 }
 
+void led_blink_act (void) {
+    next_act_counter += 1;
+}
+
 void led_task (void) {
     while (1) {
-        hw_tim_setup(TIM_ID_LED, LED_TICKRATE_MS, led_task_resume);
+        hw_tim_setup(TIM_ID_LED, LED_MS_PER_TICK, led_task_resume);
 
-        if (led_has_errors()) {
+        led_update_error_mode();
+
+        if (error_mode) {
             led_process_errors();
         } else {
-            error_cycle = 0;
             led_process_act();
         }
 
diff --git a/sw/controller/src/led.h b/sw/controller/src/led.h
index 43f13bc..1ae724d 100644
--- a/sw/controller/src/led.h
+++ b/sw/controller/src/led.h
@@ -8,9 +8,9 @@ typedef enum {
 } led_error_t;
 
 
-void led_blink_act (void);
 void led_blink_error (led_error_t error);
 void led_clear_error (led_error_t error);
+void led_blink_act (void);
 void led_task (void);
 
 
diff --git a/sw/pc/sc64.py b/sw/pc/sc64.py
index 60ad7a9..c8ad058 100755
--- a/sw/pc/sc64.py
+++ b/sw/pc/sc64.py
@@ -315,6 +315,7 @@ class SC64:
         HEADER = 3
         SCREENSHOT = 4
 
+    __isv_line_buffer: bytes = b''
     __debug_header: Optional[bytes] = None
 
     def __init__(self) -> None:
@@ -558,7 +559,10 @@ class SC64:
             self.__dd_set_block_ready(1)
 
     def __handle_isv_packet(self, data: bytes) -> None:
-        print(data.decode('EUC-JP', errors='backslashreplace'), end='')
+        self.__isv_line_buffer += data
+        while (b'\n' in self.__isv_line_buffer):
+            (line, self.__isv_line_buffer) = self.__isv_line_buffer.split(b'\n', 1)
+            print(line.decode('EUC-JP', errors='backslashreplace'))
 
     def __handle_usb_packet(self, data: bytes) -> None:
         header = self.__get_int(data[0:4])