diff --git a/DSView/res/DSCopeC20.bin b/DSView/res/DSCopeC20.bin
new file mode 100755
index 00000000..aad0f0b5
Binary files /dev/null and b/DSView/res/DSCopeC20.bin differ
diff --git a/DSView/res/DSCopeC20.fw b/DSView/res/DSCopeC20.fw
new file mode 100755
index 00000000..797af396
Binary files /dev/null and b/DSView/res/DSCopeC20.fw differ
diff --git a/DSView/res/DSCopeC20P.fw b/DSView/res/DSCopeC20P.fw
new file mode 100755
index 00000000..25916777
Binary files /dev/null and b/DSView/res/DSCopeC20P.fw differ
diff --git a/libsigrok4DSL/hardware/DSL/command.h b/libsigrok4DSL/hardware/DSL/command.h
index 80ae79b7..391902aa 100644
--- a/libsigrok4DSL/hardware/DSL/command.h
+++ b/libsigrok4DSL/hardware/DSL/command.h
@@ -45,6 +45,9 @@
 #define VTH_ADDR 0x78
 #define EEWP_ADDR 0x70
 #define COMB_ADDR 0x68
+#define EXT_I2CSEL 0x71
+#define FPGA_I2CADDR 0x21
+#define EXT_I2CADDR 0x50
 
 enum {
     DSL_CTL_FW_VERSION		= 0,
diff --git a/libsigrok4DSL/hardware/DSL/dscope.c b/libsigrok4DSL/hardware/DSL/dscope.c
index d1965384..418a7d8e 100644
--- a/libsigrok4DSL/hardware/DSL/dscope.c
+++ b/libsigrok4DSL/hardware/DSL/dscope.c
@@ -1679,6 +1679,7 @@ static int dev_acquisition_start(struct sr_dev_inst *sdi, void *cb_data)
     int ret;
     struct ctl_wr_cmd wr_cmd;
 
+
     if (sdi->status != SR_ST_ACTIVE)
         return SR_ERR_DEV_CLOSED;
 
diff --git a/libsigrok4DSL/hardware/DSL/dsl.c b/libsigrok4DSL/hardware/DSL/dsl.c
index 985b25f2..e19a75c4 100755
--- a/libsigrok4DSL/hardware/DSL/dsl.c
+++ b/libsigrok4DSL/hardware/DSL/dsl.c
@@ -271,7 +271,29 @@ SR_PRIV int dsl_wr_reg(const struct sr_dev_inst *sdi, uint8_t addr, uint8_t valu
     hdl = usb->devhdl;
 
     wr_cmd.header.dest = DSL_CTL_I2C_REG;
-    wr_cmd.header.offset = addr;
+    wr_cmd.header.offset = (FPGA_I2CADDR << 8) + addr;
+    wr_cmd.header.size = 1;
+    wr_cmd.data[0] = value;
+    if ((ret = command_ctl_wr(hdl, wr_cmd)) != SR_OK) {
+        sr_err("Sent DSL_CTL_I2C_REG command failed.");
+        return SR_ERR;
+    }
+
+    return SR_OK;
+}
+
+SR_PRIV int dsl_wr_ext(const struct sr_dev_inst *sdi, uint8_t addr, uint8_t value)
+{
+    struct sr_usb_dev_inst *usb;
+    struct libusb_device_handle *hdl;
+    struct ctl_wr_cmd wr_cmd;
+    int ret;
+
+    usb = sdi->conn;
+    hdl = usb->devhdl;
+
+    wr_cmd.header.dest = DSL_CTL_I2C_REG;
+    wr_cmd.header.offset = (EXT_I2CADDR << 8) + addr;
     wr_cmd.header.size = 1;
     wr_cmd.data[0] = value;
     if ((ret = command_ctl_wr(hdl, wr_cmd)) != SR_OK) {
@@ -1112,7 +1134,7 @@ SR_PRIV int dsl_dev_status_get(const struct sr_dev_inst *sdi, struct sr_status *
         usb = sdi->conn;
         if (prg && (devc->status == DSL_START)) {
             rd_cmd.header.dest = DSL_CTL_DSO_MEASURE;
-            rd_cmd.header.offset = begin;
+            rd_cmd.header.offset = (FPGA_I2CADDR << 8) + begin;
             rd_cmd.header.size = end - begin + 1;
             rd_cmd.data = (unsigned char*)status;
             ret = command_ctl_rd(usb->devhdl, rd_cmd);
diff --git a/libsigrok4DSL/hardware/DSL/dsl.h b/libsigrok4DSL/hardware/DSL/dsl.h
index dc166736..a84f0659 100644
--- a/libsigrok4DSL/hardware/DSL/dsl.h
+++ b/libsigrok4DSL/hardware/DSL/dsl.h
@@ -257,6 +257,18 @@ static const struct DSL_profile supported_DSCope[] = {
      "DSCope20.bin",
      DEV_CAPS_16BIT},
 
+    {0x2A0E, 0x0023, NULL, "DSCope C20", NULL,
+     "DSCopeC20.fw",
+     "DSCopeC20.bin",
+     "DSCopeC20.bin",
+     DEV_CAPS_16BIT},
+
+    {0x2A0E, 0x0024, NULL, "DSCope C20P", NULL,
+     "DSCopeC20P.fw",
+     "DSCopeC20.bin",
+     "DSCopeC20.bin",
+     DEV_CAPS_16BIT},
+
     { 0, 0, 0, 0, 0, 0, 0, 0, 0 }
 };
 
@@ -409,6 +421,7 @@ SR_PRIV int dsl_configure_probes(const struct sr_dev_inst *sdi);
 SR_PRIV uint64_t dsl_channel_depth(const struct sr_dev_inst *sdi);
 
 SR_PRIV int dsl_wr_reg(const struct sr_dev_inst *sdi, uint8_t addr, uint8_t value);
+SR_PRIV int dsl_wr_ext(const struct sr_dev_inst *sdi, uint8_t addr, uint8_t value);
 SR_PRIV int dsl_wr_dso(const struct sr_dev_inst *sdi, uint64_t cmd);
 SR_PRIV int dsl_wr_nvm(const struct sr_dev_inst *sdi, unsigned char *ctx, uint16_t addr, uint8_t len);
 SR_PRIV int dsl_rd_nvm(const struct sr_dev_inst *sdi, unsigned char *ctx, uint16_t addr, uint8_t len);