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nem

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Interesting. Can one use the VGA port for video output for say the Sega Blast city or any monitor with a VGA 24htz input?

I just tried the DE15 port recently, since I thought it would be an easy way to capture footage from. I don't have a scope, but I just took crude measurements with a multimeter and unfortunately it's not outputting 0.7vpp video. Reading was hovering around 1V. 1V isn't that high that I thought it would damage any equipment so I just connected as is to a Datapath capture card. The image was super washed out. I then put it through an OSSC and set Pre-ADC Gain to 0. I captured this footage off of Dirt Devils:

View: https://youtu.be/OXkCSigPpIA


Not bad. I might throw some trimmer pots on the video lines if I mess with it more.

Most monitors will expect 0.7vpp from the DE15 connector, I think? Tosh PF you can set to high impedance if you swap the connector.
 

nem

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The blast city was made for model 3 ! yes you can.

Have you actually tried connecting one that way?

I own the official Model 3 harness for the Blast and that uses the 15-pin AMP UP connector for video. And that's because -- like most monitors -- MS293X will expect 0.7vpp video on the DE15 connector.

However, what will likely work is this:

ms9_dsub_pcb.jpg


It's a DE15 adapter for the MS9. I remembered having one and sure enough I found it in a box. As it's a completely straight connection from DE15 to the video input on the MS9, it is meant for high impedance video. I can't think of any other use case for it except Model 3.
 

klee123

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The blast city was made for model 3 ! yes you can.
Yeah I was just curious from a connection point of view. I suppose the official Model 3 BLAST city harness would handle all aspects to run the game.
 

twistedsymphony

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The official Model 3 harness for Blast is 600-6738-20 and it appears to use the JST NH header for video... not the VGA connector
 

klee123

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That's fair enough then.

All the more reason for me to hunt for one.

That and a Vf3 board lol
 

ConversusWV

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A couple days ago I was able to hack one of my Dreamcast wheels with Model 3. I only have the potentiometers connected for CN1 and 11, but it mostly works well.

VERY IMPORTANT! If you are using this controller, the wires for the pots are backwards! Red goes to GND, brown is signal, and black needs to act as 5v. Weird design on Sega's end to make pots backwards on DC wheel, but they can do what they want. :P

Will keep you guys updated on the digital inputs. I plan wiring the 4 view buttons for Daytona/Scud and the START button. ;)
 

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ConversusWV

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I quickly wired the buttons up to CN2 on the Model 3 as per the pinouts of this wiring diagram located on top of the wheel itself, and I haven't gotten any signal coming from any of the 5 switches on the controller. The pots I wired were working earlier though.
I wonder if I mis-wired the ground or 5v again. The buttons all share a ground and signal, but then go through as a configuration. Hmm... any thoughts?
(L is the black wire and difficult to see)
 

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klee123

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Does anyone know where to get the connectors for the model 3 board. The only places I've seen are a seller at YAJ who sells them for 8800 yen for connectors to the Blast City, which is kinda expensive for wires lol.
 

ConversusWV

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Okay... I quickly realized that 5v and GND from both the 3-pin and 9-pin connectors of the Dreamcast Race Controller needed to be tied together, and then they go to the Model 3's filter board on CN 1 & CN 11 to their respective gnd, signal and 5v pins. To test, I quickly wired up one of the view buttons used for Harley-Davidson, and I got a signal from that button! Unfortunately, I need to run new wiring to the steering pot AND some of the digital inputs as I had cut them all up, and my soldering skills ain't too great (that or the cheapo Walmart Everlast solder I used really stinks), so I'm on the lookout for another copy of the wheel so I can have a fresh start. This is going to be a fun project when all finished up. :)
Special Shoutout to Rolins of the forums for helping me tremendously!
 
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