Corrections to the Cobra Command Conversion Kit Manual for Dragon's Lair 2021 March 12 - Steve Lein, Dan Schmelz, Shaun Wood, Brian Johnson 2023 January 31 - Updated pin L and M labels - Dan Schmelz Successful operation was achieved after: 1) Running the negative sync signal from pin T on the 44-pin harness to the negative horizontal sync (composite) input on the WG 49xx input bank. 2) Removing the positive sync signal from the NTSC -> RGB P203 (pin 1), going to the positive horizontal sync input on the WG 49xx input bank. 3) Providing +12vdc from the power supply to pin 2 on bank J301 on the P378 video muxing board. Note: Running a wire on the solder side of P371 from P204 pin 2 to P203 pin 2 (then connecting to J301 pin 2 on the P378) appears to be the intended method of powering the P378 (from the references and instructions in the conversion kit manual), but the majority of P371 cards out there do not have this wire between the two pins. CORRECTED PINOUT ---------------- Cobra Command main board (DE-0181-0) 44-pin edge connector: PARTS SOLDER GND 1 A GND GND 2 B ** GND +5v 3 C +5v +5v 4 D +5v +12v 5 E +12v -5v 6 F * -5v * +12v 7 H * +12v DOWN 8 J GUN UP 9 K MISSILE RIGHT 10 L 1 PLAYER START LEFT 11 M 2 PLAYER START N/C 12 N N/C COIN 1 13 P COIN 2 COUNTER 14 R N/C N/C 15 S N/C ** BLUE 16 T * NEG COMPOSITE SYNC (connects directly to monitor) ** GREEN 17 U N/C ** RED 18 V ** CTRL SPKR - 19 W SPKR + LDP AUDIO L 20 X N/C LDP AUDIO R 21 Y LDP AUDIO GND GND 22 Z GND * previously undocumented ** Connects to P378 video muxing board at P302 'From Game PCB' pin B GND to video muxing P302 pin 2 pin 16 blue to video muxing P302 pin 3 pin 17 green to video muxing P302 pin 4 pin 18 red to video muxing P302 pin 5 pin V CTRL to video muxing P302 pin 6 P378 Video Muxing board: Muxing board J301 'NTSC In' connects to 'NTSC to RGB' P203 video out: J301 pin 1 sync to P203 pin 1 sync J301 pin 3 GND to P203 pin 3 GND J301 pin 4 blue to P203 pin 4 blue J301 pin 5 green to P203 pin 5 green J301 pin 6 red to P203 pin 6 red (Provide +12vdc to J301 pin 2) Muxing board P301 connects to monitor's red, green, blue, GND inputs (don't connect sync to monitor from the muxing board) CC PCB CN2 ribbon connector to LDP controller CC PCB CN3 RCA cable to LDP video out CC PCB CN4 RCA cable to 'NTSC to RGB' video in BNC