1084SAdapter

Universal 1084S Monitor Adapter – DIN ↔ DE9 RGB Adapter/Monitor for Amiga, Tandy, and analog/digital RGB 1980's computers

Philips DIN ↔ Daewoo DE9 Converter and signal debugger/monitor

This board adapts between different 1084S monitor standards—commonly found in Philips and Daewoo variants—and allows flexible signal routing for Amiga, CGA-based PCs, and other retro systems.

---

🌟 Key Features & Use Cases

This board supports multiple configurations on a 1084S monitor (Magnavox, Philips, etc) from the 1980s and early 1990s:

1. Philips (DIN-based) to traditional Amiga (DE9)
   Use this to connect a DIN-based 1084 monitor (typically Philips) to an Amiga that outputs via DE9 monitor cable.

2. Daewoo (DE9-based) to traditional Amiga (Analog RGB DIN)
   Use this to connect a DE9-based 1084 monitor (typically Daewoo) to an Amiga that outputs via DIN monitor cable.

3. Cross-compatibility
   Adapt any other computer using these connectors to a 15kHz monitor, including hybrid setups. (Like a Myarc Geneve 9640 to a 1084S-D1/D2, or a MSX to a 1084S-D1/D2 that had a DIN connection.)

4. CGA (Tandy 1000) to Philips 1084S (Digital RGB DIN)
   Use this board to easily connect DE9 CGA-based PCs to a digital DIN-based monitor like the Philips 1084.

5. Real-time signal troubleshooting
   Connect two boards back-to-back to test sync and RGB lines without format conversion:

   Monitor (Analog RGB input) 
     <-> DIN6 male-male cable 
     <-> Adapter Board 
     <-> DE9 male-male cable 
     <-> Adapter Board 
     <-> DIN6 male (Amiga cable/Amiga)
   

6. Signal analysis and custom monitor adapter testing
   Use an oscilloscope with this board while designing new adapters or troubleshooting pinouts by experimenting with sync jumper configurations. Monitor all sync and RGB lines, and see if you're getting the output you're expecting on all lines. Helps with troubleshooting no-output situations, and if it's a computer fault, or a monitor fault.

---

⚠️ Warning

This board gives you a lot of flexibility—but with that comes responsibility.
Incorrect jumper settings, especially for sync signals, can damage your monitor. Be absolutely certain you understand what you're doing when adjusting jumper settings (J4–J9). You assume all risk for damage caused by improper usage.

---

🔧 Default Configuration

Out of the box, the board routes Horizontal and Vertical Sync directly:

• J4 (HSYNC): Enabled → Position 1–2
• J7 (VSYNC): Enabled → Position 1–2

---

🧩 Jumper Reference (Sync Routing)

Use these jumpers to customize how sync signals are routed:

Jumper	Signal Routed From (DIN)	To (DE9) Pin	Enabled When	Notes
J4	HSYNC	HSYNC	1–2	Default ON
J5	HSYNC	VSYNC	1–2	Optional, disabled
J6	HSYNC	CSYNC	1–2	Optional, disabled
J7	VSYNC	VSYNC	1–2	Default ON
J8	VSYNC	HSYNC	1–2	Optional, disabled
J9	VSYNC	CSYNC	1–2	Optional, disabled

(All jumpers can be stowed in position 2-3 when disabled.)

Note: Only enable the jumpers that suit your configuration. Never enable conflicting signals unless you're absolutely sure.

Example (Hypothetical Scenario):

You have a monitor that only accepts CSYNC, but your system provides separate HSYNC and VSYNC via DIN.
You might try:

• Enable J9: VSYNC → CSYNC
• Optionally enable J6: HSYNC → CSYNC
  ⚠️ This is theoretical; test carefully and monitor your signals.

---

🛒 Bill of Materials (BOM)

Designator	Part Number / Description
J1	TE Connectivity 5211511-1 (DIN-8) or equivalent
J2	TE Connectivity 9-211509-0 (DIN-6) or equivalent
J3	DE9 Female, Right Angle, 2.77×2.84 mm pins, 7.48 mm offset
J4–J9	3-pin standard 2.54 mm headers (6 × 3 = 18 pins total)
TP1–TP8	Test points (fit standard 2.54 mm header holes)

---

📌 Connector Pinouts

These are the relevant pinouts for the Commodore 1084S monitor. Understanding these is critical for properly wiring and configuring sync routing via jumpers (J4–J9).

---

🔌 J1 – Digital RGB Input (DIN-8, typically Philips models)

Pin	Name	Description
1	n/c	Not connected
2	R	Red
3	G	Green
4	B	Blue
5	I	Intensity
6	GND	Ground
7	HSYNC	Horizontal Sync
8	VSYNC	Vertical Sync

---

🎨 J2 – Analog RGB Input (DIN-6, typically for Amiga or other analog video sources)

Pin	Name	Description
1	G	Green
2	HSYNC	Horizontal Sync
3	GND	Ground
4	R	Red
5	B	Blue
6	VSYNC	Vertical Sync

---

🖥️ J3 – DE9 Video Connector (Female, at Monitor)

This connector supports both analog and digital RGB, combining signals from the DIN connectors internally.

Pin	Name	Analog Mode	Digital Mode
1	GND	Ground	Ground
2	GND	Ground	Ground
3	R	Red	Red
4	G	Green	Green
5	B	Blue	Blue
6	I	Not Connected	Intensity
7	CSYNC	Composite Sync	Not Connected
8	HSYNC	Not Connected	Horizontal Sync
9	VSYNC	Not Connected	Vertical Sync

📝 Note: The 1084S DE9 connector internally combines analog and digital signals from the two DIN connectors. That’s why this board can act as a bidirectional adapter between Philips-style and Daewoo-style 1084S monitors.

---

📷 Diagrams & Visuals

Pinout diagrams (DIN-6, DIN-8, and DE9) coming soon!

---