diff --git a/CMakeLists.txt b/CMakeLists.txt
index 06671f8..3f4cb41 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,6 +15,7 @@ add_executable(zavlaha
     src/main.c
     src/lcd.c
     src/ds_rtc.c
+    src/ee.c
 )
 
 # Add pico_stdlib library which aggregates commonly used features
diff --git a/src/ds_rtc.c b/src/ds_rtc.c
index 9a7f56f..81bf2d9 100644
--- a/src/ds_rtc.c
+++ b/src/ds_rtc.c
@@ -9,15 +9,11 @@
 
 #include "ds_rtc.h"
 #include "pinout.h"
+#include "rv_try.h"
 
 #define I2C_ADDR_RTC    0b1101000
 #define TIMEOUT_US 10000
 
-#define TRY(what) do { \
-    rv = (what);       \
-    if (rv < 0) { return rv; } \
-} while (0)
-
 
 static int rtc_read(uint8_t start, uint8_t *dest, size_t len) {
     int rv;
@@ -26,10 +22,11 @@ static int rtc_read(uint8_t start, uint8_t *dest, size_t len) {
     return 0;
 }
 
+static uint8_t scratch[20];
+
 static int rtc_write(uint8_t start, const uint8_t *data, size_t len) {
     int rv;
     if (len > 19) return -1;
-    uint8_t scratch[20];
     scratch[0] = start;
     memcpy(&scratch[1], data, len);
     TRY(i2c_write_timeout_us(i2c0, I2C_ADDR_RTC, scratch, len + 1, true, TIMEOUT_US));
diff --git a/src/ee.c b/src/ee.c
new file mode 100644
index 0000000..6281037
--- /dev/null
+++ b/src/ee.c
@@ -0,0 +1,52 @@
+/**
+ * TODO file description
+ */
+
+#include <pico/stdlib.h>
+#include <stdint.h>
+#include <hardware/i2c.h>
+#include <string.h>
+
+#include "ee.h"
+#include "pinout.h"
+#include "rv_try.h"
+
+#define I2C_ADDR_EEPROM 0b1010111
+#define TIMEOUT_US 20000
+
+static uint8_t scratch[64 + 2];
+
+int ee_read(uint16_t start, uint8_t *dest, size_t len) {
+    int rv;
+    uint8_t req[2] = {
+            (start & 0xFF00) >> 8,
+            start & 0xFF
+    };
+    TRY(i2c_write_timeout_us(i2c0, I2C_ADDR_EEPROM, req, 2, true, TIMEOUT_US));
+    TRY(i2c_read_timeout_us(i2c0, I2C_ADDR_EEPROM, dest, len, false, TIMEOUT_US));
+    return rv;
+}
+
+int ee_write(uint16_t start, const uint8_t *data, size_t len) {
+    int rv;
+    scratch[0] = (start & 0xFF00) >> 8;
+    scratch[1] = (start & 0xFF);
+    memcpy(&scratch[2], data, len);
+
+    TRY(i2c_write_timeout_us(i2c0, I2C_ADDR_EEPROM, scratch, 2 + len, false, TIMEOUT_US));
+
+    sleep_ms(5 * (1 + len / 8));
+
+    return rv;
+}
+
+//
+//int ee_write(uint8_t start, const uint8_t *data, size_t len) {
+//    int rv;
+//    if (len > 19) return -1;
+//    uint8_t scratch[20];
+//    scratch[0] = start;
+//    memcpy(&scratch[1], data, len);
+//    TRY(i2c_write_timeout_us(i2c0, I2C_ADDR_RTC, scratch, len + 1, true, TIMEOUT_US));
+//    return 0;
+//}
diff --git a/src/ee.h b/src/ee.h
new file mode 100644
index 0000000..acd2440
--- /dev/null
+++ b/src/ee.h
@@ -0,0 +1,14 @@
+/**
+ * TODO file description
+ */
+
+#ifndef ZAVLAHA_EE_H
+#define ZAVLAHA_EE_H
+
+/** Write and wait for completion; max 64 bytes in one go and should be aligned or at least not cross the boundary! */
+int ee_write(uint16_t start, const uint8_t *data, size_t len);
+
+/** Read data */
+int ee_read(uint16_t start, uint8_t *dest, size_t len);
+
+#endif //ZAVLAHA_EE_H
diff --git a/src/main.c b/src/main.c
index 1fced6c..6389c82 100644
--- a/src/main.c
+++ b/src/main.c
@@ -7,6 +7,7 @@
 #include "pinout.h"
 #include "lcd.h"
 #include "ds_rtc.h"
+#include "ee.h"
 
 /*
 
@@ -133,12 +134,22 @@ int main()
     lcd_init();
     lcd_puts("HELLO WORLD!");
 
+    uint8_t ee_data[1] = {};
+    int ee_rv = ee_read(0, ee_data, 1);
+    printf("ee rd rv = %d, val %02x", ee_rv, ee_data[0]);
+
+    ee_data[0]++;
+    ee_rv = ee_write(0, ee_data, 1);
+    printf("ee wr rv = %d", ee_rv);
+
+    int boot_count = ee_data[0];
 
     uint cnt = 0;
-    char buf[16];
+    char buf[20];
     while (1) {
         lcd_clear();
-        lcd_puts("HELLO WORLD!");
+        sprintf(buf, "ZAVLAHA-Boot=%d", boot_count);
+        lcd_puts(buf);
 
         // Try to read RTC
         struct rtc_time time;
diff --git a/src/pinout.h b/src/pinout.h
index a970cd7..370bd84 100644
--- a/src/pinout.h
+++ b/src/pinout.h
@@ -22,7 +22,4 @@
 #define PIN_LCD_D5   19
 #define PIN_LCD_D4   18
 
-// must be shifted left before adding the RW bit!
-#define I2C_ADDR_EEPROM 0b1010000
-
 #endif //ZAVLAHA_PINOUT_H
diff --git a/src/rv_try.h b/src/rv_try.h
new file mode 100644
index 0000000..d5556f8
--- /dev/null
+++ b/src/rv_try.h
@@ -0,0 +1,13 @@
+/**
+ * TODO file description
+ */
+
+#ifndef ZAVLAHA_RV_TRY_H
+#define ZAVLAHA_RV_TRY_H
+
+#define TRY(what) do { \
+    rv = (what);       \
+    if (rv < 0) { return rv; } \
+} while (0)
+
+#endif //ZAVLAHA_RV_TRY_H