diff --git a/EPD/EPD_driver.c b/EPD/EPD_driver.c
index 95c53f2..9df7b44 100644
--- a/EPD/EPD_driver.c
+++ b/EPD/EPD_driver.c
@@ -325,6 +325,8 @@ extern epd_model_t epd_uc8179_750_bw;
 extern epd_model_t epd_uc8179_750_bwr;
 extern epd_model_t epd_ssd1619_420_bwr;
 extern epd_model_t epd_ssd1619_420_bw;
+extern epd_model_t epd_ssd1677_750_bwr;
+extern epd_model_t epd_ssd1677_750_bw;
 extern epd_model_t epd_jd79668_420;
 
 static epd_model_t *epd_models[] = {
@@ -336,6 +338,8 @@ static epd_model_t *epd_models[] = {
     &epd_uc8179_750_bwr,
     &epd_ssd1619_420_bwr,
     &epd_ssd1619_420_bw,
+    &epd_ssd1677_750_bwr,
+    &epd_ssd1677_750_bw,
     &epd_jd79668_420,
 };
 
diff --git a/EPD/EPD_driver.h b/EPD/EPD_driver.h
index ff2ef47..3cebe66 100644
--- a/EPD/EPD_driver.h
+++ b/EPD/EPD_driver.h
@@ -50,6 +50,8 @@ typedef enum
     EPD_UC8179_750_BWR = 7,
     EPD_UC8159_750_LOW_BW = 8,
     EPD_UC8159_750_LOW_BWR = 9,
+    EPD_SSD1677_750_HD_BW = 10,
+    EPD_SSD1677_750_HD_BWR = 11,
 } epd_model_id_t;
 
 typedef enum
diff --git a/EPD/SSD16xx.c b/EPD/SSD16xx.c
index fc325c8..7c36e36 100644
--- a/EPD/SSD16xx.c
+++ b/EPD/SSD16xx.c
@@ -79,13 +79,27 @@ int8_t SSD16xx_Read_Temp(void)
 
 static void _setPartialRamArea(uint16_t x, uint16_t y, uint16_t w, uint16_t h)
 {
+    epd_model_t *EPD = epd_get();
+
     EPD_Write(CMD_ENTRY_MODE, 0x03); // set ram entry mode: x increase, y increase
-    EPD_Write(CMD_RAM_XPOS, x / 8, (x + w - 1) / 8);
+    if (EPD->id == EPD_SSD1677_750_HD_BW || EPD->id == EPD_SSD1677_750_HD_BWR) {
+        EPD_Write(CMD_RAM_XPOS,
+                  x % 256, x / 256,
+                  (x + w - 1) % 256,
+                  (x + w - 1) / 256);
+        EPD_Write(CMD_RAM_XCOUNT, x % 256, x / 256);
+    } else {
+        EPD_Write(CMD_RAM_XPOS, x / 8, (x + w - 1) / 8);
+        EPD_Write(CMD_RAM_YPOS,
+                  y % 256, y / 256,
+                  (y + h - 1) % 256,
+                  (y + h - 1) / 256);
+        EPD_Write(CMD_RAM_XCOUNT, x / 8);
+    }
     EPD_Write(CMD_RAM_YPOS,
-              y % 256, y / 256,
-              (y + h - 1) % 256,
-              (y + h - 1) / 256);
-    EPD_Write(CMD_RAM_XCOUNT, x / 8);
+                  y % 256, y / 256,
+                  (y + h - 1) % 256,
+                  (y + h - 1) / 256);
     EPD_Write(CMD_RAM_YCOUNT, y % 256, y / 256);
 }
 
@@ -222,3 +236,21 @@ const epd_model_t epd_ssd1619_420_bw = {
     .width = 400,
     .height = 300,
 };
+
+// SSD1677 880x528 Black/White/Red
+const epd_model_t epd_ssd1677_750_bwr = {
+    .id = EPD_SSD1677_750_HD_BWR,
+    .color = BWR,
+    .drv = &epd_drv_ssd1619,
+    .width = 880,
+    .height = 528,
+};
+
+// SSD1677 880x528 Black/White
+const epd_model_t epd_ssd1677_750_bw = {
+    .id = EPD_SSD1677_750_HD_BW,
+    .color = BW,
+    .drv = &epd_drv_ssd1619,
+    .width = 880,
+    .height = 528,
+};
diff --git a/EPD/UC81xx.c b/EPD/UC81xx.c
index c5163ef..34dcad9 100644
--- a/EPD/UC81xx.c
+++ b/EPD/UC81xx.c
@@ -87,7 +87,6 @@ static void _setPartialRamArea(uint16_t x, uint16_t y, uint16_t w, uint16_t h)
     uint16_t xe = (x + w - 1) | 0x0007; // byte boundary inclusive (last byte)
     uint16_t ye = y + h - 1;
     x &= 0xFFF8;       // byte boundary
-    xe |= 0x0007;      // byte boundary
     EPD_Write(CMD_PTL, // partial window
               x / 256, x % 256,
               xe / 256, xe % 256,