diff --git a/converter/pc98_usb/Makefile b/converter/pc98_usb/Makefile
index 076371dbf..2575d8667 100644
--- a/converter/pc98_usb/Makefile
+++ b/converter/pc98_usb/Makefile
@@ -11,8 +11,8 @@ TARGET_DIR = .
 SRC =	keymap.c \
 	matrix.c \
 	led.c \
-	command_extra.c \
-	protocol/serial_soft.c
+	protocol/serial_uart.c
+#	protocol/serial_soft.c
 
 CONFIG_H = config.h
 
diff --git a/converter/pc98_usb/README b/converter/pc98_usb/README
index 7d9547d50..23f1b614e 100644
--- a/converter/pc98_usb/README
+++ b/converter/pc98_usb/README
@@ -60,6 +60,11 @@ http://davy.nyacom.net/kbd98usb/
 
 PC98 to PS/2
 http://www.tsp.ne.jp/~sawada/mago/c_gka98at.htm
+http://www.tsp.ne.jp/~sawada/mago/src/gka98at.asm
 
 PC98 keyboard commands
 http://www.webtech.co.jp/company/doc/undocumented_mem/io_kb.txt
+
+
+Inhibit repeating key:
+0x9C, 0x70
diff --git a/converter/pc98_usb/command_extra.c b/converter/pc98_usb/command_extra.c
deleted file mode 100644
index 50389467e..000000000
--- a/converter/pc98_usb/command_extra.c
+++ /dev/null
@@ -1,43 +0,0 @@
-#include "stdbool.h"
-#include "stdint.h"
-#include "keycode.h"
-#include "serial.h"
-#include "print.h"
-#include "command.h"
-
-bool command_extra(uint8_t code)
-{
-    switch (code) {
-        case KC_H:
-        case KC_SLASH: /* ? */
-            print("\n\n----- Sun converter Help -----\n");
-            print("UP:	Bell On\n");
-            print("DOWN:	Bell Off\n");
-            print("LEFT:	Click On\n");
-            print("RIGHT:	Click Off\n");
-            return false;
-        case KC_UP:
-            print("Bell On\n");
-            serial_send(0x02);
-            break;
-        case KC_DOWN:
-            print("Bell Off\n");
-            serial_send(0x03);
-            break;
-        case KC_LEFT:
-            print("Click On\n");
-            serial_send(0x0A);
-            break;
-        case KC_RIGHT:
-            print("Click Off\n");
-            serial_send(0x0B);
-            break;
-        case KC_NUMLOCK:
-            print("layout\n");
-            serial_send(0x0F);
-            break;
-        default:
-            return false;
-    }
-    return true;
-}
diff --git a/converter/pc98_usb/config.h b/converter/pc98_usb/config.h
index 6ef2c6ac3..4f91c07ce 100644
--- a/converter/pc98_usb/config.h
+++ b/converter/pc98_usb/config.h
@@ -27,30 +27,22 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
 /* matrix size */
-#define MATRIX_ROWS 16
-#define MATRIX_COLS 8
+#define MATRIX_ROWS     16
+#define MATRIX_COLS     8
 
+/* To use new keymap framework */
+#define USE_KEYMAP_V2
 
 /* key combination for command */
-#define IS_COMMAND() ( \
-    keyboard_report->mods == (MOD_BIT(KC_LALT) | MOD_BIT(KC_RALT)) || \
-    keyboard_report->mods == (MOD_BIT(KC_LGUI) | MOD_BIT(KC_RGUI)) || \
-    keyboard_report->mods == (MOD_BIT(KC_LSHIFT) | MOD_BIT(KC_RSHIFT)) \
+#define IS_COMMAND()    ( \
+    host_get_first_key() == KC_CANCEL \
 )
 
 
-/* PC98 Serial(USART) configuration
- *     asynchronous, positive logic, 19200baud, bit order: LSB first
- *     1-start bit, 8-data bit, odd parity, 1-stop bit
- */
-#define SERIAL_BAUD 19200
-#define SERIAL_PARITY_ODD
-#define SERIAL_BIT_ORDER_LSB
-
-/* PC98 Reset Port */
+/* PC98 Reset Port shared with TXD */
 #define PC98_RST_DDR    DDRD
 #define PC98_RST_PORT   PORTD
-#define PC98_RST_BIT    1
+#define PC98_RST_BIT    3
 /* PC98 Ready Port */
 #define PC98_RDY_DDR    DDRD
 #define PC98_RDY_PORT   PORTD
@@ -60,41 +52,75 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define PC98_RTY_PORT   PORTD
 #define PC98_RTY_BIT    5
 
+/*
+ * PC98 Serial(USART) configuration
+ *     asynchronous, positive logic, 19200baud, bit order: LSB first
+ *     1-start bit, 8-data bit, odd parity, 1-stop bit
+ */
+/*
+ * Software Serial
+ */
+#define SERIAL_SOFT_BAUD                19200
+#define SERIAL_SOFT_PARITY_ODD
+#define SERIAL_SOFT_BIT_ORDER_LSB
+#define SERIAL_SOFT_LOGIC_POSITIVE
 /* RXD Port */
-#define SERIAL_RXD_DDR  DDRD
-#define SERIAL_RXD_PORT PORTD
-#define SERIAL_RXD_PIN  PIND
-#define SERIAL_RXD_BIT  2
-#define SERIAL_RXD_READ()       (SERIAL_RXD_PIN&(1<<SERIAL_RXD_BIT))
+#define SERIAL_SOFT_RXD_DDR             DDRD
+#define SERIAL_SOFT_RXD_PORT            PORTD
+#define SERIAL_SOFT_RXD_PIN             PIND
+#define SERIAL_SOFT_RXD_BIT             2
+#define SERIAL_SOFT_RXD_READ()          (SERIAL_SOFT_RXD_PIN&(1<<SERIAL_SOFT_RXD_BIT))
 /* RXD Interupt */
-#define SERIAL_RXD_VECT INT2_vect
-#define SERIAL_RXD_INIT()  do { \
+#define SERIAL_SOFT_RXD_VECT            INT2_vect
+#define SERIAL_SOFT_RXD_INIT()          do { \
     /* pin configuration: input with pull-up */ \
-    SERIAL_RXD_DDR &= ~(1<<SERIAL_RXD_BIT);     \
-    SERIAL_RXD_PORT |= (1<<SERIAL_RXD_BIT);     \
-    /* enable interrupt: INT2(falling edge) */  \
-    EICRA |= ((1<<ISC21)|(0<<ISC20));           \
-    EIMSK |= (1<<INT2);                         \
+    SERIAL_SOFT_RXD_DDR &= ~(1<<SERIAL_SOFT_RXD_BIT); \
+    SERIAL_SOFT_RXD_PORT |= (1<<SERIAL_SOFT_RXD_BIT); \
+    /* enable interrupt: INT2(falling edge) */ \
+    EICRA |= ((1<<ISC21)|(0<<ISC20)); \
+    EIMSK |= (1<<INT2); \
+    sei(); \
 } while (0)
-#define SERIAL_RXD_INT_ENTER()
-#define SERIAL_RXD_INT_EXIT() do {  \
-    /* clear interrupt  flag */     \
-    EIFR = (1<<INTF2);              \
+#define SERIAL_SOFT_RXD_INT_ENTER()
+#define SERIAL_SOFT_RXD_INT_EXIT()      do { \
+    /* clear interrupt  flag */ \
+    EIFR = (1<<INTF2); \
+} while (0)
+/* TXD Port */
+#define SERIAL_SOFT_TXD_DDR             DDRD
+#define SERIAL_SOFT_TXD_PORT            PORTD
+#define SERIAL_SOFT_TXD_PIN             PIND
+#define SERIAL_SOFT_TXD_BIT             3
+#define SERIAL_SOFT_TXD_HI()            do { SERIAL_SOFT_TXD_PORT |=  (1<<SERIAL_SOFT_TXD_BIT); } while (0)
+#define SERIAL_SOFT_TXD_LO()            do { SERIAL_SOFT_TXD_PORT &= ~(1<<SERIAL_SOFT_TXD_BIT); } while (0)
+#define SERIAL_SOFT_TXD_INIT()          do { \
+    /* pin configuration: output */ \
+    SERIAL_SOFT_TXD_DDR |= (1<<SERIAL_SOFT_TXD_BIT); \
+    /* idle */ \
+    SERIAL_SOFT_TXD_ON(); \
 } while (0)
 
-/* TXD Port: Not used */
-#define SERIAL_TXD_DDR  DDRD
-#define SERIAL_TXD_PORT PORTD
-#define SERIAL_TXD_PIN  PIND
-#define SERIAL_TXD_BIT  3
-/* negative logic */
-#define SERIAL_TXD_ON()     do { SERIAL_TXD_PORT &= ~(1<<SERIAL_TXD_BIT); } while (0)
-#define SERIAL_TXD_OFF()    do { SERIAL_TXD_PORT |=  (1<<SERIAL_TXD_BIT); } while (0)
-#define SERIAL_TXD_INIT()   do { \
-    /* pin configuration: output */         \
-    SERIAL_TXD_DDR |= (1<<SERIAL_TXD_BIT);  \
-    /* idle */                              \
-    SERIAL_TXD_ON();                        \
-} while (0)
+
+/*
+ * Hardware Serial(UART)
+ */
+#ifdef __AVR_ATmega32U4__
+    #define SERIAL_UART_BAUD       19200
+    #define SERIAL_UART_DATA       UDR1
+    #define SERIAL_UART_UBRR       ((F_CPU/(16UL*SERIAL_UART_BAUD))-1)
+    #define SERIAL_UART_RXD_VECT   USART1_RX_vect
+    #define SERIAL_UART_TXD_READY  (UCSR1A&(1<<UDRE1))
+    #define SERIAL_UART_INIT()     do { \
+        UBRR1L = (uint8_t) SERIAL_UART_UBRR;       /* baud rate */ \
+        UBRR1H = (uint8_t) (SERIAL_UART_UBRR>>8);  /* baud rate */ \
+        UCSR1B |= (1<<RXCIE1) | (1<<RXEN1); /* RX interrupt, RX: enable */ \
+        UCSR1B |= (0<<TXCIE1) | (1<<TXEN1); /* TX interrupt, TX: enable */ \
+        UCSR1C |= (1<<UPM11) | (1<<UPM10);  /* parity: none(00), even(01), odd(11) */ \
+        sei(); \
+    } while(0)
+#else
+    #error "USART configuration is needed."
+#endif
+
 
 #endif
diff --git a/converter/pc98_usb/keymap.c b/converter/pc98_usb/keymap.c
index 1e2dd03d5..6bc549b05 100644
--- a/converter/pc98_usb/keymap.c
+++ b/converter/pc98_usb/keymap.c
@@ -19,6 +19,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <stdbool.h>
 #include <avr/pgmspace.h>
 #include "keycode.h"
+#include "action.h"
+#include "action_macro.h"
+#include "layer_switch.h"
 #include "util.h"
 #include "keymap.h"
 
@@ -33,7 +36,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
   |    00| 01| 02| 03| 04| 05|  58|  71| 06| 07| 08| 09| 0A|    0E|
   |---------------------------------------------------------------|
   |   0F| 10| 11| 12| 13| 14|    3A     | 15| 16| 17| 18| 19|   1C|
-  |---------------------------------------------------------------|
+  |---------------------------------------------------------'.    |
   |  74| 20| 21| 22| 23| 24|  3B  |  3C  | 25| 26| 27| 28| 29|    |
   |---------------------------------------------------------------|
   | 70| 2A| 2B| 2C| 2D| 2E| 38|  3D   | 39| 2F| 30| 31| 32| 33| 70|
@@ -70,33 +73,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
 
-
-// Assign Fn key(0-7) to a layer to which switch with the Fn key pressed.
-static const uint8_t PROGMEM fn_layer[] = {
-    2,              // Fn0
-    3,              // Fn1
-    4,              // Fn2
-    0,              // Fn3
-    0,              // Fn4
-    0,              // Fn5
-    0,              // Fn6
-    0               // Fn7
-};
-
-// Assign Fn key(0-7) to a keycode sent when release Fn key without use of the layer.
-// See layer.c for details.
-static const uint8_t PROGMEM fn_keycode[] = {
-    KC_NO,          // Fn0
-    KC_SCLN,        // Fn1
-    KC_SLSH,        // Fn2
-    KC_NO,          // Fn3
-    KC_NO,          // Fn4
-    KC_NO,          // Fn5
-    KC_NO,          // Fn6
-    KC_NO           // Fn7
-};
-
-
 static const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     /*
   ,---------------------------------------------------------------.
@@ -115,73 +91,80 @@ static const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
           `-----------------------------------------------'
     */
     KEYMAP(
-    PAUS,COPY,  F1,  F2,  F3,  F4,  F5,  F6,  F7,  F8,  F9, F10, F11, F12, F13, F14,
+  CANCEL,COPY,  F1,  F2,  F3,  F4,  F5,  F6,  F7,  F8,  F9, F10, F11, F12, F13, F14,
       ESC,    1,   2,   3,   4,   5,    NO, NO,     6,   7,   8,   9,   0,   BSPC,
       TAB,    Q,   W,   E,   R,   T,      UP,       Y,   U,   I,   O,   P,   ENT,
-      LCTL,  A,   S,   D,   F,   G,  MINS,  EQL,     H,   J,   K,   L,SCLN,
-      LSFT, Z,   X,   C,   V,   B, INS, DOWN,  DEL,   N,   M,COMM, DOT,SLSH,
+      LCTL,  A,   S,   D,   F,   G,  MINS,  EQL,     H,   J,   K,   L, FN2,
+      LSFT, Z,   X,   C,   V,   B, INS, DOWN,  DEL,   N,   M,COMM, DOT, FN1,
+              LGUI, LALT, LCTL, LSFT,      SPC,      SPC,   RALT
+    ),
+    KEYMAP(
+    PAUS,COPY,  F1,  F2,  F3,  F4,  F5,  F6,  F7,  F8,  F9, F10, F11, F12, F13, F14,
+      GRV,   F1,  F2,  F3,  F4,  F5,    NO, NO,    F6,  F7,  F8,  F9, F10,    DEL,
+      TAB,    Q,   W,   E,   R,   T,      UP,    HOME,PGDN,PGUP, END,   P,   ENT,
+      LCTL,  A,   S,   D,   F,   G,  MINS,  EQL,  LEFT,DOWN,  UP,RGHT,SCLN,
+      LSFT, Z,   X,   C,   V,   B, INS, DOWN,  DEL,HOME,PGDN,PGUP, END,TRNS,
+              LGUI, LALT, LCTL, LSFT,      SPC,      SPC,   RALT
+    ),
+    KEYMAP(
+    PAUS,COPY,  F1,  F2,  F3,  F4,  F5,  F6,  F7,  F8,  F9, F10, F11, F12, F13, F14,
+      GRV,   F1,  F2,  F3,  F4,  F5,    NO, NO,    F6,  F7,  F8,  F9, F10,    DEL,
+      TAB,    Q,   W,   E,   R,   T,      UP,    WH_L,WH_D,WH_U,WH_R,   P,   ENT,
+      LCTL,  A,   S,   D,   F,   G,  MINS,  EQL,  MS_L,MS_D,MS_U,MS_R,TRNS,
+      LSFT, Z,   X,   C,   V,   B, INS, DOWN, BTN3,BTN2,BTN1,BTN4,BTN5,TRNS,
               LGUI, LALT, LCTL, LSFT,      SPC,      SPC,   RALT
     ),
 };
 
+static const uint8_t PROGMEM overlays[][MATRIX_ROWS][MATRIX_COLS] = {};
 
-uint8_t keymap_get_keycode(uint8_t layer, uint8_t row, uint8_t col)
+static const uint16_t PROGMEM fn_actions[] = {
+    ACTION_KEYMAP_TAP_TOGGLE(0),                 // FN0
+    ACTION_KEYMAP_TAP_KEY(1, KC_SLASH),          // FN1
+    ACTION_KEYMAP_TAP_KEY(2, KC_SCLN),           // FN2
+    ACTION_KEYMAP(2),                            // FN3
+};
+
+
+
+/*
+ * No need to edit.
+ */
+#define KEYMAPS_SIZE    (sizeof(keymaps) / sizeof(keymaps[0]))
+#define OVERLAYS_SIZE   (sizeof(overlays) / sizeof(overlays[0]))
+#define FN_ACTIONS_SIZE (sizeof(fn_actions) / sizeof(fn_actions[0]))
+
+/* translates key to keycode */
+uint8_t keymap_key_to_keycode(uint8_t layer, key_t key)
 {
-    return pgm_read_byte(&keymaps[(layer)][(row)][(col)]);
+    /* Overlay: 16-31(OVERLAY_BIT(0x10) | overlay_layer) */
+    if (layer & OVERLAY_BIT) {
+        layer &= OVERLAY_MASK;
+        if (layer < OVERLAYS_SIZE) {
+            return pgm_read_byte(&overlays[(layer)][(key.row)][(key.col)]);
+        } else {
+            return KC_TRANSPARENT;
+        }
+    } 
+    /* Keymap: 0-15 */
+    else {
+        if (layer < KEYMAPS_SIZE) {
+            return pgm_read_byte(&keymaps[(layer)][(key.row)][(key.col)]);
+        } else {
+            // fall back to layer 0
+            return pgm_read_byte(&keymaps[0][(key.row)][(key.col)]);
+        }
+    }
 }
 
-uint8_t keymap_fn_layer(uint8_t index)
+/* translates Fn keycode to action */
+action_t keymap_fn_to_action(uint8_t keycode)
 {
-    return pgm_read_byte(&fn_layer[index]);
+    action_t action;
+    if (FN_INDEX(keycode) < FN_ACTIONS_SIZE) {
+        action.code = pgm_read_word(&fn_actions[FN_INDEX(keycode)]);
+    } else {
+        action.code = ACTION_NO;
+    }
+    return action;
 }
-
-uint8_t keymap_fn_keycode(uint8_t index)
-{
-    return pgm_read_byte(&fn_keycode[index]);
-}
-
-
-#if 0
-/* PC-9801-98-S02   Raku Raku keyboard(Luckyboard) M-siki mode
-  ,---------------------------------------------------------------.
-  | 60| 61| 62| 63| 64| 65| 66| 67| 68| 69| 6A| 6B| 36| 37| 3F| 3E|
-  `---------------------------------------------------------------'
-  ,---------------------------------------------------------------.
-  |    00| 01| 02| 03| 04| 05| NUM|CAPS| 06| 07| 08| 09| 0A|    0E|
-  |---------------------------------------------------------------|
-  |   0F| 10| 25| 20| 23| 2B|    3A     | 2F| 15| 13| 11| 19|   1C|
-  |---------------------------------------------------------------|
-  |  74| 12| 16| 17| 1D| 18|  3B  |  3C  | 24| 1E| 14| 2E| 22|    |
-  |---------------------------------------------------------------|
-  | 70| xx| 2A| 2C| xx| xx| 38|  3D   | 39| 21| 29| 1F| xx| 2D| 70|
-  `---------------------------------------------------------------'
-          | 73|   51|   xx|   xx|       34|   xx|   35| xx|
-          `-----------------------------------------------'
-*/
-
-#define KEYMAP_M( \
-    K60, K61, K62, K63, K64, K65, K66, K67, K68, K69, K6A, K6B, K36, K37, K3F, K3E, \
-      K00,  K01, K02, K03, K04, K05,              K06, K07, K08, K09, K0A,    K0E,  \
-      K0F,  K10, K25, K23, K20, K2B,     K3A,     K2F, K15, K13, K11, K19,    K1C,  \
-      K74, K12, K16, K17, K1D, K18,   K3B,  K3C,   K24, K1E, K14, K2E, K22,         \
-      K70,     K2A, K2C,           K38,  K3D,  K39, K21, K29, K1F,      K2D,        \
-               K73,  K51,                  K34,              K35                    \
-) { \
-    { KC_##K00, KC_##K01, KC_##K02, KC_##K03, KC_##K04, KC_##K05, KC_##K06, KC_##K07 }, \
-    { KC_##K08, KC_##K09, KC_##K0A, KC_NO,    KC_NO,    KC_NO,    KC_##K0E, KC_##K0F }, \
-    { KC_##K10, KC_##K11, KC_##K12, KC_##K13, KC_##K14, KC_##K15, KC_##K16, KC_##K17 }, \
-    { KC_##K18, KC_##K19, KC_NO,    KC_NO,    KC_##K1C, KC_##K1D, KC_##K1E, KC_##K1F }, \
-    { KC_##K20, KC_##K21, KC_##K22, KC_##K23, KC_##K24, KC_##K25, KC_NO,    KC_NO    }, \
-    { KC_NO,    KC_##K29, KC_##K2A, KC_##K2B, KC_##K2C, KC_##K2D, KC_##K2E, KC_##K2F }, \
-    { KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_##K34, KC_##K35, KC_##K36, KC_##K37 }, \
-    { KC_##K38, KC_##K39, KC_##K3A, KC_##K3B, KC_##K3C, KC_##K3D, KC_##K3E, KC_##K3F }, \
-    { KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO    }, \
-    { KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO    }, \
-    { KC_NO,    KC_##K51, KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO    }, \
-    { KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO    }, \
-    { KC_##K60, KC_##K61, KC_##K62, KC_##K63, KC_##K64, KC_##K65, KC_##K66, KC_##K67 }, \
-    { KC_##K68, KC_##K69, KC_##K6A, KC_##K6B, KC_NO,    KC_NO,    KC_NO,    KC_NO    }, \
-    { KC_##K70, KC_NO,    KC_NO,    KC_##K73, KC_##K74, KC_NO,    KC_NO,    KC_NO    }, \
-    { KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO,    KC_NO    }  \
-}
-#endif
diff --git a/converter/pc98_usb/matrix.c b/converter/pc98_usb/matrix.c
index 2f1e821c5..d03aaf10d 100644
--- a/converter/pc98_usb/matrix.c
+++ b/converter/pc98_usb/matrix.c
@@ -61,11 +61,41 @@ uint8_t matrix_cols(void)
     return MATRIX_COLS;
 }
 
+static void pc98_inhibit_repeat(void)
+{
+    uint8_t code;
+
+    while (serial_recv()) ;
+RETRY:
+    PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
+    _delay_ms(500);
+    serial_send(0x9C);
+
+    PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
+    _delay_ms(100);
+    while (!(code = serial_recv())) ;
+    print("PC98: send 9C: "); print_hex8(code); print("\n");
+    if (code != 0xFA) goto RETRY;
+
+
+
+    PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
+    _delay_ms(100);
+    serial_send(0x70);
+
+    PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
+    _delay_ms(100);
+    //code = serial_recv();
+    while (!(code = serial_recv())) ;
+    print("PC98: send 70: "); print_hex8(code); print("\n");
+    if (code != 0xFA) goto RETRY;
+}
+
 void matrix_init(void)
 {
     print_enable = true;
-    debug_enable = true;
-    //debug_matrix = true;
+//    debug_enable = true;
+//    debug_matrix = true;
 
     PC98_RST_DDR |= (1<<PC98_RST_BIT);
     PC98_RDY_DDR |= (1<<PC98_RDY_BIT);
@@ -74,17 +104,21 @@ void matrix_init(void)
     PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
     PC98_RTY_PORT |= (1<<PC98_RTY_BIT);
 
-    DDRD |= 1<<7;
-
 
     serial_init();
 
     // PC98 reset
+/*
     PC98_RST_PORT &= ~(1<<PC98_RST_BIT);
     _delay_us(15);
     PC98_RST_PORT |= (1<<PC98_RST_BIT);
     _delay_us(13);
-    PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
+    PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
+*/
+
+    _delay_ms(500);
+    pc98_inhibit_repeat();
+
 
     // PC98 ready
     PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
@@ -107,7 +141,20 @@ uint8_t matrix_scan(void)
     PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
     if (code == -1) return 0;
 
-    debug_hex(code); debug(" ");
+if (code == 0x60) {
+    pc98_inhibit_repeat();
+
+/*
+    PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
+    _delay_ms(100);
+    serial_send(0x96);
+    PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
+*/
+
+    return 0;
+}
+
+    print_hex8(code); print(" ");
 
     if (code&0x80) {
         // break code
diff --git a/converter/sun_usb/config.h b/converter/sun_usb/config.h
index b4f0ff977..65ce9daf6 100644
--- a/converter/sun_usb/config.h
+++ b/converter/sun_usb/config.h
@@ -43,40 +43,46 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *     asynchronous, negative logic, 1200baud, no flow control
  *     1-start bit, 8-data bit, non parity, 1-stop bit
  */
-#define SERIAL_BAUD 1200
-
-#define SERIAL_RXD_DDR  DDRD
-#define SERIAL_RXD_PORT PORTD
-#define SERIAL_RXD_PIN  PIND
-#define SERIAL_RXD_BIT  2
-#define SERIAL_RXD_VECT INT2_vect
-#define SERIAL_RXD_INIT()  do { \
+#define SERIAL_SOFT_BAUD            1200
+#define SERIAL_SOFT_PARITY_NONE
+#define SERIAL_SOFT_BIT_ORDER_LSB
+#define SERIAL_SOFT_LOGIC_NEGATIVE
+/* RXD Port */
+#define SERIAL_SOFT_RXD_ENABLE
+#define SERIAL_SOFT_RXD_DDR         DDRD
+#define SERIAL_SOFT_RXD_PORT        PORTD
+#define SERIAL_SOFT_RXD_PIN         PIND
+#define SERIAL_SOFT_RXD_BIT         2
+#define SERIAL_SOFT_RXD_VECT        INT2_vect
+/* RXD Interupt */
+#define SERIAL_SOFT_RXD_INIT()      do { \
     /* pin configuration: input with pull-up */ \
-    SERIAL_RXD_DDR &= ~(1<<SERIAL_RXD_BIT);     \
-    SERIAL_RXD_PORT |= (1<<SERIAL_RXD_BIT);     \
-    /* enable interrupt: INT2(rising edge) */   \
-    EICRA |= ((1<<ISC21)|(1<<ISC20));           \
-    EIMSK |= (1<<INT2);                         \
+    SERIAL_SOFT_RXD_DDR &= ~(1<<SERIAL_SOFT_RXD_BIT); \
+    SERIAL_SOFT_RXD_PORT |= (1<<SERIAL_SOFT_RXD_BIT); \
+    /* enable interrupt: INT2(rising edge) */ \
+    EICRA |= ((1<<ISC21)|(1<<ISC20)); \
+    EIMSK |= (1<<INT2); \
+    sei(); \
 } while (0)
-#define SERIAL_RXD_INT_ENTER()
-#define SERIAL_RXD_INT_EXIT() do {  \
-    /* clear interrupt  flag */     \
-    EIFR = (1<<INTF2);              \
+#define SERIAL_SOFT_RXD_INT_ENTER()
+#define SERIAL_SOFT_RXD_INT_EXIT()  do { \
+    /* clear interrupt  flag */ \
+    EIFR = (1<<INTF2); \
 } while (0)
-#define SERIAL_RXD_READ()    (~SERIAL_RXD_PIN&(1<<SERIAL_RXD_BIT))
-
-#define SERIAL_TXD_DDR  DDRD
-#define SERIAL_TXD_PORT PORTD
-#define SERIAL_TXD_PIN  PIND
-#define SERIAL_TXD_BIT  3
-/* negative logic */
-#define SERIAL_TXD_ON()     do { SERIAL_TXD_PORT &= ~(1<<SERIAL_TXD_BIT); } while (0)
-#define SERIAL_TXD_OFF()    do { SERIAL_TXD_PORT |=  (1<<SERIAL_TXD_BIT); } while (0)
-#define SERIAL_TXD_INIT()   do { \
-    /* pin configuration: output */         \
-    SERIAL_TXD_DDR |= (1<<SERIAL_TXD_BIT);  \
-    /* idle */                              \
-    SERIAL_TXD_ON();                        \
+#define SERIAL_SOFT_RXD_READ()      (SERIAL_SOFT_RXD_PIN&(1<<SERIAL_SOFT_RXD_BIT))
+/* TXD Port */
+#define SERIAL_SOFT_TXD_ENABLE
+#define SERIAL_SOFT_TXD_DDR         DDRD
+#define SERIAL_SOFT_TXD_PORT        PORTD
+#define SERIAL_SOFT_TXD_PIN         PIND
+#define SERIAL_SOFT_TXD_BIT         3
+#define SERIAL_SOFT_TXD_HI()        do { SERIAL_SOFT_TXD_PORT |=  (1<<SERIAL_SOFT_TXD_BIT); } while (0)
+#define SERIAL_SOFT_TXD_LO()        do { SERIAL_SOFT_TXD_PORT &= ~(1<<SERIAL_SOFT_TXD_BIT); } while (0)
+#define SERIAL_SOFT_TXD_INIT()      do { \
+    /* pin configuration: output */ \
+    SERIAL_SOFT_TXD_DDR |= (1<<SERIAL_SOFT_TXD_BIT); \
+    /* idle */ \
+    SERIAL_SOFT_TXD_ON(); \
 } while (0)
 
 #endif
diff --git a/protocol/serial_soft.c b/protocol/serial_soft.c
index 3c9c914ed..e8870bcd7 100644
--- a/protocol/serial_soft.c
+++ b/protocol/serial_soft.c
@@ -43,12 +43,32 @@ POSSIBILITY OF SUCH DAMAGE.
 
 /*
  *  Stupid Inefficient Busy-wait Software Serial
- *  is still useful for negative logic signal like Sun protocol not supported by hardware USART.
+ *  which is still useful for negative logic signal like Sun protocol
+ *  if it is not supported by hardware UART.
+ *
+ *  TODO: delay is not accurate enough. Instruction cycle should be counted and inline assemby is needed.
  */
 
-#define WAIT_US     (1000000/SERIAL_BAUD)
+#define WAIT_US     (1000000L/SERIAL_SOFT_BAUD)
+
+#ifdef SERIAL_SOFT_LOGIC_NEGATIVE
+    #define SERIAL_SOFT_RXD_IN()        !(SERIAL_SOFT_RXD_READ())
+    #define SERIAL_SOFT_TXD_ON()        SERIAL_SOFT_TXD_LO()
+    #define SERIAL_SOFT_TXD_OFF()       SERIAL_SOFT_TXD_HI()
+#else
+    #define SERIAL_SOFT_RXD_IN()        !!(SERIAL_SOFT_RXD_READ())
+    #define SERIAL_SOFT_TXD_ON()        SERIAL_SOFT_TXD_HI()
+    #define SERIAL_SOFT_TXD_OFF()       SERIAL_SOFT_TXD_LO()
+#endif
+
+#ifdef SERIAL_SOFT_PARITY_EVEN
+    #define SERIAL_SOFT_PARITY_VAL      0
+#elif defined(SERIAL_SOFT_PARITY_ODD)
+    #define SERIAL_SOFT_PARITY_VAL      1
+#endif
 
 /* debug for signal timing, see debug pin with oscilloscope */
+#define SERIAL_SOFT_DEBUG
 #ifdef SERIAL_SOFT_DEBUG
     #define SERIAL_SOFT_DEBUG_INIT()    (DDRD |= 1<<7)
     #define SERIAL_SOFT_DEBUG_TGL()     (PORTD ^= 1<<7)
@@ -62,8 +82,8 @@ void serial_init(void)
 {
     SERIAL_SOFT_DEBUG_INIT();
 
-    SERIAL_RXD_INIT();
-    SERIAL_TXD_INIT();
+    SERIAL_SOFT_RXD_INIT();
+    SERIAL_SOFT_TXD_INIT();
 }
 
 /* RX ring buffer */
@@ -100,85 +120,98 @@ int16_t serial_recv2(void)
 void serial_send(uint8_t data)
 {
     /* signal state: IDLE: ON, START: OFF, STOP: ON, DATA0: OFF, DATA1: ON */
-    /* start bit */
-    SERIAL_TXD_OFF();
-    _delay_us(WAIT_US);
 
-#ifdef SERIAL_BIT_ORDER_MSB
+#ifdef SERIAL_SOFT_BIT_ORDER_MSB
     uint8_t mask = 0x80;
 #else
     uint8_t mask = 0x01;
 #endif
+
+    uint8_t parity = 0;
+
+    /* start bit */
+    SERIAL_SOFT_TXD_OFF();
+    _delay_us(WAIT_US);
+
     while (mask) {
-        if (data&mask) { SERIAL_TXD_ON(); } else { SERIAL_TXD_OFF(); }
+        if (data&mask) {
+            SERIAL_SOFT_TXD_ON();
+            parity ^= 1;
+        } else {
+            SERIAL_SOFT_TXD_OFF();
+        }
         _delay_us(WAIT_US);
 
-#ifdef SERIAL_BIT_ORDER_MSB
+#ifdef SERIAL_SOFT_BIT_ORDER_MSB
         mask >>= 1;
 #else
         mask <<= 1;
 #endif
     }
 
+#if defined(SERIAL_SOFT_PARITY_EVEN) || defined(SERIAL_SOFT_PARITY_ODD)
+    /* to center of parity bit */
+    if (parity != SERIAL_SOFT_PARITY_VAL) {
+        SERIAL_SOFT_TXD_ON();
+    } else {
+        SERIAL_SOFT_TXD_OFF();
+    }
+    _delay_us(WAIT_US);
+#endif
+
     /* stop bit */
-    SERIAL_TXD_ON();
+    SERIAL_SOFT_TXD_ON();
     _delay_us(WAIT_US);
 }
 
 /* detect edge of start bit */
-ISR(SERIAL_RXD_VECT)
+ISR(SERIAL_SOFT_RXD_VECT)
 {
-    SERIAL_SOFT_DEBUG_TGL()
-    SERIAL_RXD_INT_ENTER()
+    SERIAL_SOFT_DEBUG_TGL();
+    SERIAL_SOFT_RXD_INT_ENTER()
 
     uint8_t data = 0;
 
-#ifdef SERIAL_BIT_ORDER_MSB
+#ifdef SERIAL_SOFT_BIT_ORDER_MSB
     uint8_t mask = 0x80;
 #else
     uint8_t mask = 0x01;
 #endif
 
-#ifdef SERIAL_PARITY_ODD
     uint8_t parity = 0;
-#elif defined(SERIAL_PARITY_EVEN)
-    uint8_t parity = 1;
-#endif
 
     /* to center of start bit */
     _delay_us(WAIT_US/2);
-    SERIAL_SOFT_DEBUG_TGL()
+    SERIAL_SOFT_DEBUG_TGL();
     do {
         /* to center of next bit */
         _delay_us(WAIT_US);
 
-    SERIAL_SOFT_DEBUG_TGL()
-        if (SERIAL_RXD_READ()) {
+    SERIAL_SOFT_DEBUG_TGL();
+        if (SERIAL_SOFT_RXD_IN()) {
             data |= mask;
-#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
             parity ^= 1;
-#endif
         }
-#ifdef SERIAL_BIT_ORDER_MSB
+#ifdef SERIAL_SOFT_BIT_ORDER_MSB
         mask >>= 1;
 #else
         mask <<= 1;
 #endif
     } while (mask);
 
-#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
+#if defined(SERIAL_SOFT_PARITY_EVEN) || defined(SERIAL_SOFT_PARITY_ODD)
     /* to center of parity bit */
     _delay_us(WAIT_US);
-    if (SERIAL_RXD_READ()) { parity ^= 1; }
-    SERIAL_SOFT_DEBUG_TGL()
+    if (SERIAL_SOFT_RXD_IN()) { parity ^= 1; }
+    SERIAL_SOFT_DEBUG_TGL();
 #endif
 
     /* to center of stop bit */
     _delay_us(WAIT_US);
 
     uint8_t next = (rbuf_head + 1) % RBUF_SIZE;
-#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
-    if (parity && next != rbuf_tail) {
+#if defined(SERIAL_SOFT_PARITY_EVEN) || defined(SERIAL_SOFT_PARITY_ODD)
+    if ((parity == SERIAL_SOFT_PARITY_VAL) && next != rbuf_tail) {
 #else
     if (next != rbuf_tail) {
 #endif
@@ -186,6 +219,6 @@ ISR(SERIAL_RXD_VECT)
         rbuf_head = next;
     }
 
-    SERIAL_RXD_INT_EXIT();
-    SERIAL_SOFT_DEBUG_TGL()
+    SERIAL_SOFT_RXD_INT_EXIT();
+    SERIAL_SOFT_DEBUG_TGL();
 }
diff --git a/protocol/serial_uart.c b/protocol/serial_uart.c
new file mode 100644
index 000000000..6c0af8817
--- /dev/null
+++ b/protocol/serial_uart.c
@@ -0,0 +1,93 @@
+/*
+Copyright 2013 Jun WAKO <wakojun@gmail.com>
+
+This software is licensed with a Modified BSD License.
+All of this is supposed to be Free Software, Open Source, DFSG-free,
+GPL-compatible, and OK to use in both free and proprietary applications.
+Additions and corrections to this file are welcome.
+
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in
+  the documentation and/or other materials provided with the
+  distribution.
+
+* Neither the name of the copyright holders nor the names of
+  contributors may be used to endorse or promote products derived
+  from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include <stdbool.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include "serial.h"
+
+
+void serial_init(void)
+{
+    SERIAL_UART_INIT();
+}
+
+// RX ring buffer
+#define RBUF_SIZE   8
+static uint8_t rbuf[RBUF_SIZE];
+static uint8_t rbuf_head = 0;
+static uint8_t rbuf_tail = 0;
+
+uint8_t serial_recv(void)
+{
+    uint8_t data = 0;
+    if (rbuf_head == rbuf_tail) {
+        return 0;
+    }
+
+    data = rbuf[rbuf_tail];
+    rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE;
+    return data;
+}
+
+int16_t serial_recv2(void)
+{
+    uint8_t data = 0;
+    if (rbuf_head == rbuf_tail) {
+        return -1;
+    }
+
+    data = rbuf[rbuf_tail];
+    rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE;
+    return data;
+}
+
+void serial_send(uint8_t data)
+{
+    while (!SERIAL_UART_TXD_READY) ;
+    SERIAL_UART_DATA = data;
+}
+
+// USART RX complete interrupt
+ISR(SERIAL_UART_RXD_VECT)
+{
+    uint8_t next = (rbuf_head + 1) % RBUF_SIZE;
+    if (next != rbuf_tail) {
+        rbuf[rbuf_head] = SERIAL_UART_DATA;
+        rbuf_head = next;
+    }
+}