diff --git a/main/CMakeLists.txt b/main/CMakeLists.txt
index 84ed32d5..6cc626ca 100644
--- a/main/CMakeLists.txt
+++ b/main/CMakeLists.txt
@@ -27,6 +27,7 @@ idf_component_register(SRCS "main.c"
                             "bluetooth/hidp_sw.c"
                             "drivers/sd.c"
                             "wired/detect.c"
+                            "wired/npiso.c"
                             "wired/sega_io.c"
                             "wired/nsi.c"
                             "wired/maple.c"
diff --git a/main/main.c b/main/main.c
index f69e6487..34d092a2 100644
--- a/main/main.c
+++ b/main/main.c
@@ -6,6 +6,7 @@
 #include "adapter/config.h"
 #include "bluetooth/host.h"
 #include "wired/detect.h"
+#include "wired/npiso.h"
 #include "wired/sega_io.h"
 #include "wired/nsi.h"
 #include "wired/maple.h"
@@ -30,11 +31,11 @@ static const char *sys_name[WIRED_MAX] = {
 
 static const wired_init_t wired_init[WIRED_MAX] = {
     NULL,
-    NULL,
+    npiso_init,
     NULL,
     NULL,
     sega_io_init,
-    NULL,
+    npiso_init,
     NULL,
     sega_io_init,
     nsi_init,
diff --git a/main/wired/npiso.c b/main/wired/npiso.c
new file mode 100644
index 00000000..c1a1b832
--- /dev/null
+++ b/main/wired/npiso.c
@@ -0,0 +1,353 @@
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+#include <xtensa/hal.h>
+#include <esp_intr_alloc.h>
+#include "driver/gpio.h"
+#include "../zephyr/types.h"
+#include "../util.h"
+#include "../adapter/adapter.h"
+#include "../adapter/config.h"
+#include "npiso.h"
+
+#define NPISO_PORT_MAX 2
+#define NPISO_LATCH_PIN 32
+#define NPISO_LATCH_MASK (1U << 0) /* First of 2nd bank of GPIO */
+#define NPISO_TIMEOUT 4096
+
+enum {
+    NPISO_CLK = 0,
+    NPISO_SEL,
+    NPISO_D0,
+    NPISO_D1,
+    NPISO_PIN_MAX,
+};
+
+enum {
+    DEV_NONE = 0,
+    DEV_FC_NES_PAD,
+    DEV_FC_NES_MULTITAP,
+    DEV_FC_MULTITAP_ALT,
+    DEV_FC_TRACKBALL,
+    DEV_FC_KB,
+    DEV_SFC_SNES_PAD,
+    DEV_SFC_SNES_MULTITAP,
+    DEV_SFC_SNES_MOUSE,
+    DEV_SNES_XBAND_KB,
+};
+
+static const uint8_t gpio_pins[NPISO_PORT_MAX][NPISO_PIN_MAX] = {
+    { 5, 23, 19, 21},
+    {18, 26, 22, 25},
+};
+
+static const uint32_t gpio_mask[NPISO_PORT_MAX][NPISO_PIN_MAX] = {
+    {(1U <<  5), (1U << 23), (1U << 19), (1U << 21)},
+    {(1U << 18), (1U << 26), (1U << 22), (1U << 25)},
+};
+
+static uint8_t dev_type[NPISO_PORT_MAX] = {0};
+static uint8_t mt_first_port[NPISO_PORT_MAX] = {0};
+static uint8_t buffer[8];
+static uint32_t cnt[2] = {0};
+static uint8_t mask[2] = {0x80, 0x80};
+
+static void IRAM_ATTR set_data(uint8_t port, uint8_t data_id, uint8_t value) {
+    uint8_t pin = gpio_pins[port][NPISO_D0 + data_id];
+
+    if (value) {
+        GPIO.out_w1ts = BIT(pin);
+    }
+    else {
+        GPIO.out_w1tc = BIT(pin);
+    }
+}
+
+static void IRAM_ATTR npiso_fc_nes_2p_isr(void* arg) {
+    const uint32_t low_io = GPIO.acpu_int;
+    const uint32_t high_io = GPIO.acpu_int1.intr;
+
+    /* reset bit counter, set first bit */
+    if (high_io & NPISO_LATCH_MASK) {
+        set_data(0, 0, wired_adapter.data[0].output[0] & 0x80);
+        set_data(1, 0, wired_adapter.data[1].output[0] & 0x80);
+        cnt[0] = 1;
+        cnt[1] = 1;
+        mask[0] = 0x40;
+        mask[1] = 0x40;
+    }
+
+    /* Update port 0 */
+    if (low_io & gpio_mask[0][NPISO_CLK]) {
+        if (cnt[0] > 7) {
+            set_data(0, 0, 0);
+        }
+        else {
+            set_data(0, 0, wired_adapter.data[0].output[0] & mask[0]);
+        }
+        cnt[0]++;
+        mask[0] >>= 1;
+    }
+
+    /* Update port 1 */
+    if (low_io & gpio_mask[1][NPISO_CLK]) {
+        if (cnt[1] > 7) {
+            set_data(1, 0, 0);
+        }
+        else {
+            set_data(1, 0, wired_adapter.data[1].output[0] & mask[1]);
+        }
+        cnt[1]++;
+        mask[1] >>= 1;
+    }
+
+    if (high_io) GPIO.status1_w1tc.intr_st = high_io;
+    if (low_io) GPIO.status_w1tc = low_io;
+}
+
+static void IRAM_ATTR npiso_fc_4p_isr(void* arg) {
+    const uint32_t low_io = GPIO.acpu_int;
+    const uint32_t high_io = GPIO.acpu_int1.intr;
+
+    /* reset bit counter, set first bit */
+    if (high_io & NPISO_LATCH_MASK) {
+        set_data(0, 0, wired_adapter.data[0].output[0] & 0x80);
+        set_data(1, 0, wired_adapter.data[1].output[0] & 0x80);
+        set_data(0, 1, wired_adapter.data[2].output[0] & 0x80);
+        set_data(1, 1, wired_adapter.data[3].output[0] & 0x80);
+        cnt[0] = 1;
+        cnt[1] = 1;
+        mask[0] = 0x40;
+        mask[1] = 0x40;
+    }
+
+    /* Update port 0 */
+    if (low_io & gpio_mask[0][NPISO_CLK]) {
+        if (cnt[0] > 7) {
+            set_data(0, 0, 0);
+            set_data(0, 1, 0);
+        }
+        else {
+            set_data(0, 0, wired_adapter.data[0].output[0] & mask[0]);
+            set_data(0, 1, wired_adapter.data[2].output[0] & mask[0]);
+        }
+        cnt[0]++;
+        mask[0] >>= 1;
+    }
+
+    /* Update port 1 */
+    if (low_io & gpio_mask[1][NPISO_CLK]) {
+        if (cnt[1] > 7) {
+            set_data(1, 0, 0);
+            set_data(1, 1, 0);
+        }
+        else {
+            set_data(1, 0, wired_adapter.data[1].output[0] & mask[1]);
+            set_data(1, 1, wired_adapter.data[3].output[0] & mask[1]);
+        }
+        cnt[1]++;
+        mask[1] >>= 1;
+    }
+
+    if (high_io) GPIO.status1_w1tc.intr_st = high_io;
+    if (low_io) GPIO.status_w1tc = low_io;
+}
+
+static void IRAM_ATTR npiso_nes_fs_isr(void* arg) {
+    const uint32_t low_io = GPIO.acpu_int;
+    const uint32_t high_io = GPIO.acpu_int1.intr;
+    uint32_t idx0, idx1;
+
+    /* reset bit counter, set first bit */
+    if (high_io & NPISO_LATCH_MASK) {
+        set_data(0, 0, wired_adapter.data[0].output[0] & 0x80);
+        set_data(1, 0, wired_adapter.data[1].output[0] & 0x80);
+        cnt[0] = 1;
+        cnt[1] = 1;
+        mask[0] = 0x40;
+        mask[1] = 0x40;
+    }
+
+    idx0 = cnt[0] >> 3;
+    idx1 = cnt[1] >> 3;
+
+    /* Update port 0 */
+    if (low_io & gpio_mask[0][NPISO_CLK]) {
+        switch (idx0) {
+            case 0:
+                set_data(0, 0, wired_adapter.data[0].output[0] & mask[0]);
+                break;
+            case 1:
+                set_data(0, 0, wired_adapter.data[2].output[0] & mask[0]);
+                break;
+            case 2:
+                set_data(0, 0, 0xEF & mask[0]);
+                break;
+            default:
+                set_data(0, 0, 0);
+                break;
+        }
+        cnt[0]++;
+        mask[0] >>= 1;
+        if (!mask[0]) {
+            mask[0] = 0x80;
+        }
+    }
+
+    /* Update port 1 */
+    if (low_io & gpio_mask[1][NPISO_CLK]) {
+        switch (idx1) {
+            case 0:
+                set_data(1, 0, wired_adapter.data[1].output[0] & mask[1]);
+                break;
+            case 1:
+                set_data(1, 0, wired_adapter.data[3].output[0] & mask[1]);
+                break;
+            case 2:
+                set_data(1, 0, 0xDF & mask[1]);
+                break;
+            default:
+                set_data(1, 0, 0);
+                break;
+        }
+        cnt[1]++;
+        mask[1] >>= 1;
+        if (!mask[1]) {
+            mask[1] = 0x80;
+        }
+    }
+
+    if (high_io) GPIO.status1_w1tc.intr_st = high_io;
+    if (low_io) GPIO.status_w1tc = low_io;
+}
+
+void npiso_init(void)
+{
+    gpio_config_t io_conf = {0};
+
+    if (wired_adapter.system_id == NES) {
+        switch (config.global_cfg.multitap_cfg) {
+            case MT_SLOT_1:
+            case MT_SLOT_2:
+            case MT_DUAL:
+                dev_type[0] = DEV_FC_NES_MULTITAP;
+                dev_type[1] = DEV_FC_NES_MULTITAP;
+                mt_first_port[1] = 2;
+                break;
+            case MT_ALT:
+                dev_type[0] = DEV_FC_MULTITAP_ALT;
+                dev_type[1] = DEV_FC_MULTITAP_ALT;
+                break;
+            default:
+                mt_first_port[1] = 1;
+                break;
+        }
+
+        for (uint32_t i = 0; i < NPISO_PORT_MAX; i++) {
+            if (dev_type[i] == DEV_NONE) {
+                switch (config.out_cfg[i].dev_mode) {
+                    case DEV_PAD:
+                    case DEV_PAD_ALT:
+                        dev_type[i] = DEV_FC_NES_PAD;
+                        break;
+                    case DEV_KB:
+                        dev_type[i] = DEV_FC_KB;
+                        break;
+                    case DEV_MOUSE:
+                        dev_type[i] = DEV_FC_TRACKBALL;
+                        break;
+                }
+            }
+        }
+    }
+    else {
+        switch (config.global_cfg.multitap_cfg) {
+            case MT_SLOT_1:
+                dev_type[0] = DEV_SFC_SNES_MULTITAP;
+                mt_first_port[1] = 4;
+                break;
+            case MT_SLOT_2:
+                dev_type[1] = DEV_SFC_SNES_MULTITAP;
+                mt_first_port[1] = 1;
+                break;
+            case MT_DUAL:
+                dev_type[0] = DEV_SFC_SNES_MULTITAP;
+                dev_type[1] = DEV_SFC_SNES_MULTITAP;
+                mt_first_port[1] = 4;
+                break;
+            default:
+                mt_first_port[1] = 1;
+                break;
+        }
+
+        for (uint32_t i = 0; i < NPISO_PORT_MAX; i++) {
+            if (dev_type[i] == DEV_NONE) {
+                switch (config.out_cfg[i].dev_mode) {
+                    case DEV_PAD:
+                    case DEV_PAD_ALT:
+                        dev_type[i] = DEV_SFC_SNES_PAD;
+                        break;
+                    case DEV_KB:
+                        dev_type[i] = DEV_SNES_XBAND_KB;
+                        break;
+                    case DEV_MOUSE:
+                        dev_type[i] = DEV_SFC_SNES_MOUSE;
+                        break;
+                }
+            }
+        }
+    }
+
+    /* Latch */
+    io_conf.intr_type = GPIO_PIN_INTR_POSEDGE;
+    io_conf.pin_bit_mask = 1ULL << NPISO_LATCH_PIN;
+    io_conf.mode = GPIO_MODE_INPUT;
+    io_conf.pull_down_en = GPIO_PULLDOWN_DISABLE;
+    io_conf.pull_up_en = GPIO_PULLUP_DISABLE;
+    gpio_config(&io_conf);
+
+    /* Clocks */
+    for (uint32_t i = 0; i < NPISO_PORT_MAX; i++) {
+        io_conf.intr_type = GPIO_PIN_INTR_POSEDGE;
+        io_conf.pin_bit_mask = 1ULL << gpio_pins[i][NPISO_CLK];
+        io_conf.mode = GPIO_MODE_INPUT;
+        io_conf.pull_down_en = GPIO_PULLDOWN_DISABLE;
+        io_conf.pull_up_en = GPIO_PULLUP_ENABLE;
+        gpio_config(&io_conf);
+    }
+
+    /* Selects */
+    for (uint32_t i = 0; i < NPISO_PORT_MAX; i++) {
+        io_conf.intr_type = GPIO_PIN_INTR_DISABLE;
+        io_conf.pin_bit_mask = 1ULL << gpio_pins[i][NPISO_SEL];
+        io_conf.mode = GPIO_MODE_INPUT;
+        io_conf.pull_down_en = GPIO_PULLDOWN_DISABLE;
+        io_conf.pull_up_en = GPIO_PULLUP_ENABLE;
+        gpio_config(&io_conf);
+    }
+
+    /* D0, D1 */
+    for (uint32_t i = 0; i < NPISO_PORT_MAX; i++) {
+        for (uint32_t j = NPISO_D0; j <= NPISO_D1; j++) {
+            io_conf.intr_type = GPIO_PIN_INTR_DISABLE;
+            io_conf.pin_bit_mask = 1ULL << gpio_pins[i][j];
+            io_conf.mode = GPIO_MODE_OUTPUT;
+            io_conf.pull_down_en = GPIO_PULLDOWN_DISABLE;
+            io_conf.pull_up_en = GPIO_PULLUP_ENABLE;
+            gpio_config(&io_conf);
+            set_data(i, j &  0x1, 1);
+        }
+    }
+
+    if (dev_type[0] == DEV_FC_NES_MULTITAP) {
+        esp_intr_alloc(ETS_GPIO_INTR_SOURCE, ESP_INTR_FLAG_LEVEL3, npiso_nes_fs_isr, NULL, NULL);
+    }
+    else if (dev_type[0] == DEV_FC_MULTITAP_ALT) {
+        esp_intr_alloc(ETS_GPIO_INTR_SOURCE, ESP_INTR_FLAG_LEVEL3, npiso_fc_4p_isr, NULL, NULL);
+    }
+    else {
+        esp_intr_alloc(ETS_GPIO_INTR_SOURCE, ESP_INTR_FLAG_LEVEL3, npiso_fc_nes_2p_isr, NULL, NULL);
+    }
+}
diff --git a/main/wired/npiso.h b/main/wired/npiso.h
new file mode 100644
index 00000000..3461ad48
--- /dev/null
+++ b/main/wired/npiso.h
@@ -0,0 +1,6 @@
+#ifndef _NPISO_H_
+#define _NPISO_H_
+
+void npiso_init(void);
+
+#endif /* _NPISO_H_ */