diff --git a/src/content/docs/getting-started/connections.md b/src/content/docs/getting-started/connections.md
index e5b77a4..3632032 100644
--- a/src/content/docs/getting-started/connections.md
+++ b/src/content/docs/getting-started/connections.md
@@ -15,7 +15,7 @@ The RS-UV3A has the following major connection points:
 4. **JP1** — Arduino/serial header
 5. **ICSP** — PIC programmer header
 6. **AMP** — Power amplifier header
-7. **I/O** — DB-9 external interface
+7. **I/O** — DE-9 external interface
 8. **SPK/MIC** — 3.5mm TRRS jack
 9. **JP2** — FTDI cable header
 10. **26M** — Oscillator output
@@ -92,10 +92,10 @@ Four signals for microcontroller integration:
 - `4` — High when CTCSS detected
 - `5` — Always high
 
-## I/O Connector (DB-9)
+## I/O Connector (DE-9)
 
 :::danger[Not RS-232!]
-The DB-9 connector uses **3.3V/5V TTL levels**, NOT standard RS-232 voltages. Connecting to a true RS-232 port may damage the RS-UV3A.
+The DE-9 connector uses **3.3V/5V TTL levels**, NOT standard RS-232 voltages. Connecting to a true RS-232 port may damage the RS-UV3A.
 :::
 
 | Pin | Signal | Description |
@@ -191,7 +191,7 @@ To use RS-UVPA: Clear solder from SJ1 and connect amplifier to PA header.
 
 ## I/O Power Header (I/O_P)
 
-Install jumper to put 8.5V on DB-9 pin 6. Useful for powering:
+Install jumper to put 8.5V on DE-9 pin 6. Useful for powering:
 - GPS receivers
 - Bluetooth modules
 - Other 5V–8.5V accessories
diff --git a/src/content/docs/getting-started/serial-setup.md b/src/content/docs/getting-started/serial-setup.md
index f8c81db..e121474 100644
--- a/src/content/docs/getting-started/serial-setup.md
+++ b/src/content/docs/getting-started/serial-setup.md
@@ -14,10 +14,10 @@ The RS-UV3A provides three serial connection methods:
 | **On-board USB** | Micro USB | Most users—single cable for power and control |
 | **JP1 Header** | 0.1" header | Arduino and microcontroller projects |
 | **JP2 Header** | 6-pin header | FTDI cable or Raspberry Pi |
-| **DB-9 I/O** | DB-9 pins 7/8 | External serial devices |
+| **DE-9 I/O** | DE-9 pins 7/8 | External serial devices |
 
 :::note[Important]
-JP1 and JP2 share the same internal serial port (`B1` baud setting). The DB-9 uses a separate serial port (`B2` baud setting).
+JP1 and JP2 share the same internal serial port (`B1` baud setting). The DE-9 uses a separate serial port (`B2` baud setting).
 :::
 
 ## On-board USB (Recommended)
@@ -131,7 +131,7 @@ B13       # Set to 19200 (default)
 B15       # Set to 57600
 ```
 
-### External Serial (DB-9)
+### External Serial (DE-9)
 
 ```
 B23       # Set to 19200 (default)
diff --git a/src/content/docs/guides/firmware-upgrade.md b/src/content/docs/guides/firmware-upgrade.md
index cf03337..537fa2b 100644
--- a/src/content/docs/guides/firmware-upgrade.md
+++ b/src/content/docs/guides/firmware-upgrade.md
@@ -64,7 +64,7 @@ If the RS-UV3A won't respond to commands (corrupted firmware):
 1. Power off the RS-UV3A
 2. Place a jumper on the ICSP header:
    - Pins 1-2 for USB/JP1 serial upload
-   - Pins 4-5 for DB-9 serial upload
+   - Pins 4-5 for DE-9 serial upload
 3. Power on the RS-UV3A
 
 The RS-UV3A will boot directly into bootloader mode.
@@ -159,6 +159,6 @@ For reference, the ICSP header pins (when viewed from the top):
 ```
 
 - **Pins 1-2 jumper:** Bootloader on USB/JP1 serial
-- **Pins 4-5 jumper:** Bootloader on DB-9 serial
+- **Pins 4-5 jumper:** Bootloader on DE-9 serial
 
 Remove the jumper after successful upload to resume normal operation.
diff --git a/src/content/docs/guides/icsp-programming.md b/src/content/docs/guides/icsp-programming.md
index ca20a90..b3f5cc6 100644
--- a/src/content/docs/guides/icsp-programming.md
+++ b/src/content/docs/guides/icsp-programming.md
@@ -38,7 +38,7 @@ Viewed from the top of the board:
 | 3 | PGD | Programming data (PIC RB7, pin 17) |
 | 4 | PGC | Programming clock (PIC RB6, pin 16) |
 | 5 | GND | Ground |
-| 6 | Boot Select B | Jumper to pin 5 forces DB-9 bootloader on startup |
+| 6 | Boot Select B | Jumper to pin 5 forces DE-9 bootloader on startup |
 
 ## Method 1: Bootloader Forcing (Jumper)
 
@@ -53,11 +53,11 @@ If your RS-UV3A is unresponsive (bad firmware upload, corrupted flash), you can
 5. Power off and **remove the jumper**
 6. Power on — normal operation resumes
 
-### DB-9 Serial Upload
+### DE-9 Serial Upload
 
 1. Power off the RS-UV3A
 2. Place a jumper across **pins 5–6** (or 4–5, verify against your board revision)
-3. Power on — the board enters bootloader mode on DB-9
+3. Power on — the board enters bootloader mode on DE-9
 4. Upload firmware using mikroBootloader at 115200 baud
 5. Power off and **remove the jumper**
 6. Power on — normal operation resumes
diff --git a/src/content/docs/guides/packet-aprs.md b/src/content/docs/guides/packet-aprs.md
index 8807ab8..2c5dd2c 100644
--- a/src/content/docs/guides/packet-aprs.md
+++ b/src/content/docs/guides/packet-aprs.md
@@ -15,11 +15,11 @@ The RS-UV3A provides:
 
 ## Hardware Connections
 
-### Using the DB-9 I/O Connector
+### Using the DE-9 I/O Connector
 
-Connect your TNC or sound card modem to the DB-9:
+Connect your TNC or sound card modem to the DE-9:
 
-| DB-9 Pin | Signal | TNC Connection |
+| DE-9 Pin | Signal | TNC Connection |
 |----------|--------|----------------|
 | 1 | TX Audio In | TNC TX audio out |
 | 2 | PTT | TNC PTT output |
@@ -28,7 +28,7 @@ Connect your TNC or sound card modem to the DB-9:
 | 5 | COR | TNC COR/DCD input (optional) |
 
 :::danger[TTL Levels!]
-The DB-9 is NOT RS-232! Use only TTL (3.3V/5V) devices or a level converter.
+The DE-9 is NOT RS-232! Use only TTL (3.3V/5V) devices or a level converter.
 :::
 
 ### Audio Level Adjustment
@@ -70,7 +70,7 @@ ST0             # Save settings
 
 ## COR (Carrier Operated Relay)
 
-The DB-9 pin 5 provides a COR output:
+The DE-9 pin 5 provides a COR output:
 - **Low (ground)** when squelch is open
 - **Open circuit** when squelch is closed
 
@@ -88,7 +88,7 @@ CO?             # Query current setting
 
 ## External Serial for TNC Control
 
-If your TNC needs to send commands to the RS-UV3A, configure the DB-9 serial:
+If your TNC needs to send commands to the RS-UV3A, configure the DE-9 serial:
 
 ```
 EX1             # Enable serial on E_TX/E_RX pins
diff --git a/src/content/docs/guides/repeater-satellite.md b/src/content/docs/guides/repeater-satellite.md
index 5090bca..03d62ec 100644
--- a/src/content/docs/guides/repeater-satellite.md
+++ b/src/content/docs/guides/repeater-satellite.md
@@ -19,8 +19,8 @@ You'll need:
 
 | RX Board | TX Board |
 |----------|----------|
-| RX Audio Out (DB-9 pin 4) | TX Audio In (DB-9 pin 1) |
-| COR Out (DB-9 pin 5) | PTT (DB-9 pin 2) |
+| RX Audio Out (DE-9 pin 4) | TX Audio In (DE-9 pin 1) |
+| COR Out (DE-9 pin 5) | PTT (DE-9 pin 2) |
 | Ground | Ground |
 
 The COR-to-PTT connection automatically keys the TX board when the RX board hears a signal.
diff --git a/src/content/docs/index.mdx b/src/content/docs/index.mdx
index 04330ad..bf749af 100644
--- a/src/content/docs/index.mdx
+++ b/src/content/docs/index.mdx
@@ -76,7 +76,7 @@ The Rev A board adds several improvements over previous revisions:
 
 - **On-board USB-Serial:** Driverless FTDI chip for plug-and-play operation
 - **Wide-range DC-DC:** Buck-boost converter accepts 3.5V to 16V input
-- **Power Output:** Optional power on DB-9 pin 6 for accessories
+- **Power Output:** Optional power on DE-9 pin 6 for accessories
 - **LED Indicators:** Power, TX, and user-definable status LED
 
 ---
diff --git a/src/content/docs/reference/commands/index.md b/src/content/docs/reference/commands/index.md
index ec7cda6..aa37529 100644
--- a/src/content/docs/reference/commands/index.md
+++ b/src/content/docs/reference/commands/index.md
@@ -14,7 +14,7 @@ This page provides a quick reference for all 66 RS-UV3A serial commands. Click o
 - Default baud rate is **19200**
 
 :::danger[Serial Port Warning]
-The DB-9 connector uses **TTL levels (3.3V/5V)**, NOT RS-232 voltages. Do not connect to a standard RS-232 port.
+The DE-9 connector uses **TTL levels (3.3V/5V)**, NOT RS-232 voltages. Do not connect to a standard RS-232 port.
 :::
 
 ## Quick Reference Table
diff --git a/src/content/docs/reference/commands/io-control.md b/src/content/docs/reference/commands/io-control.md
index 0fec3fd..9158e0e 100644
--- a/src/content/docs/reference/commands/io-control.md
+++ b/src/content/docs/reference/commands/io-control.md
@@ -102,7 +102,7 @@ AO?             # Query current function
 
 ## EX – External Pins
 
-Sets the function of E_TX and E_RX pins on the DB-9 I/O connector.
+Sets the function of E_TX and E_RX pins on the DE-9 I/O connector.
 
 ### Syntax
 
@@ -145,7 +145,7 @@ EX?             # Query current function
 
 - Serial mode uses 3.3V logic levels
 - Indicator mode useful for external controllers
-- Choose mode based on what's connected to DB-9
+- Choose mode based on what's connected to DE-9
 
 ---
 
diff --git a/src/content/docs/reference/commands/system.md b/src/content/docs/reference/commands/system.md
index 9004d95..1ac5b4c 100644
--- a/src/content/docs/reference/commands/system.md
+++ b/src/content/docs/reference/commands/system.md
@@ -443,7 +443,7 @@ B1?             # Query current setting
 
 ## B2 – Baud Rate 2
 
-Sets the baud rate for serial port 2 (DB-9 I/O connector).
+Sets the baud rate for serial port 2 (DE-9 I/O connector).
 
 ### Syntax
 
diff --git a/src/content/docs/reference/connectors.md b/src/content/docs/reference/connectors.md
index 379aed1..8e3ea19 100644
--- a/src/content/docs/reference/connectors.md
+++ b/src/content/docs/reference/connectors.md
@@ -73,9 +73,9 @@ Provides both power and serial communication through a single cable.
 - **Input:** 3.3V and 5V tolerant
 - **Output:** 2V–5V (determined by VIO voltage)
 
-## I/O Connector (DB-9)
+## I/O Connector (DE-9)
 
-DB-9 male connector for external audio, serial, and control:
+DE-9 male connector for external audio, serial, and control:
 
 | Pin | Signal | Direction | Description |
 |:---:|--------|:---------:|-------------|
@@ -217,11 +217,11 @@ Pins are staggered to allow programming without soldering a header.
 | Jumper | Result |
 |--------|--------|
 | 1-2 | Boot to bootloader on USB/JP1 serial |
-| 4-5 | Boot to bootloader on DB-9 serial |
+| 4-5 | Boot to bootloader on DE-9 serial |
 
 ## I/O Power Header (I/O_P)
 
-2-pin jumper to enable 8.5V on DB-9 pin 6:
+2-pin jumper to enable 8.5V on DE-9 pin 6:
 
 | State | Result |
 |-------|--------|
diff --git a/src/content/docs/reference/hardware-revisions.md b/src/content/docs/reference/hardware-revisions.md
index 5c6bd8a..2c8ae14 100644
--- a/src/content/docs/reference/hardware-revisions.md
+++ b/src/content/docs/reference/hardware-revisions.md
@@ -27,7 +27,7 @@ The Rev A is the latest and recommended version.
 | **USB Power** | Can be powered entirely from USB |
 | **Micro USB** | Single connector for power + serial |
 | **LED Indicators** | Power, TX, and user-configurable Status |
-| **DB-9 Power** | Optional 8.5V on pin 6 via I/O_P jumper |
+| **DE-9 Power** | Optional 8.5V on pin 6 via I/O_P jumper |
 
 ### Removed in Rev A
 
diff --git a/src/content/docs/reference/specifications.md b/src/content/docs/reference/specifications.md
index 987d6ad..0012b8a 100644
--- a/src/content/docs/reference/specifications.md
+++ b/src/content/docs/reference/specifications.md
@@ -87,7 +87,7 @@ The transmitter includes individual low-pass filters for each band:
 | VIN | 5.5×2.1 mm barrel | DC power input |
 | USB | Micro USB | Power + serial |
 | SPK/MIC | 3.5 mm TRRS | Speaker-microphone |
-| I/O | DB-9 male | Audio, serial, control |
+| I/O | DE-9 male | Audio, serial, control |
 | JP1 | 0.1" header | Arduino interface |
 | JP2 | 0.1" header | FTDI cable |
 | ICSP | 0.1" header | Programming |
@@ -102,10 +102,10 @@ The transmitter includes individual low-pass filters for each band:
 | Logic Levels | 3.3V/5V TTL |
 | Default Baud | 19200 |
 | Available Bauds | 1200, 4800, 9600, 19200, 38400, 57600 |
-| Serial Ports | 2 (USB/JP1 and DB-9) |
+| Serial Ports | 2 (USB/JP1 and DE-9) |
 
 :::danger[Not RS-232]
-The DB-9 connector uses TTL logic levels (3.3V/5V), NOT RS-232 voltages. Do not connect to standard RS-232 equipment.
+The DE-9 connector uses TTL logic levels (3.3V/5V), NOT RS-232 voltages. Do not connect to standard RS-232 equipment.
 :::
 
 ## Environmental