gbs-8200 and Sega genesis model 1 sync

[kynrek]

I have a Sega genesis model 1 and I want to use my gbs-8200 CGA to VGA converter to do an RGB to vga conversion. The board has inputs for RGB sync and ground I know most people use SCART but I was going to make my own 8pin din cable to grab the R G B ground and sync signals from the genesis outputport. With the output from the sync pin work (as opposed to stripping if from the composite video)?

Here is a picture of the gbs-8200 board:

[beatsgo]

So first things first: welcome to the forum!

The GBS-8200 has the 5pin EGA/CGA port, which as you can see uses R, G, B, GND, and S. Base off of the first Genesis pinout, you'll be connecting pins 7, 4, 8, 2, and 6 to their respected pins. The Genesis already has a C-Sync line, so you don't need to worry about stripping video data from it.

[kynrek]

So first things first: welcome to the forum!

The GBS-8200 has the 5pin EGA/CGA port, which as you can see uses R, G, B, GND, and S. Base off of the first Genesis pinout, you'll be connecting pins 7, 4, 8, 2, and 6 to their respected pins. The Genesis already has a C-Sync line, so you don't need to worry about stripping video data from it.

Great, thanks for the welcome and for your response!

Does anyone know if i will need to "boost" the sync? (It seems to be something that is commonly done)

[kynrek]

I happened to have a "project" SNES lying around. I hooked up straight to the RGB and Sync (not composite, but plain sync) from the board to my gbs-8200 and it worked without any extra parts! I am hoping the Sega will work the same way. All I had to do was hold the down button on the gbs-8200 for about 10 seconds and it did an auto adjust and the picture show up perfectly.

[TheRac25]

Great, thanks for the welcome and for your response!

Does anyone know if i will need to "boost" the sync? (It seems to be something that is commonly done)

actually you need to add a 680 ohm dropper resistor since the gbs max voltage on inputs is 3.6v

[kynrek]

Great, thanks for the welcome and for your response!

Does anyone know if i will need to "boost" the sync? (It seems to be something that is commonly done)

actually you need to add a 680 ohm dropper resistor since the gbs max voltage on inputs is 3.6v

Ok Great, Thanks!

[kynrek]

Great, thanks for the welcome and for your response!

Does anyone know if i will need to "boost" the sync? (It seems to be something that is commonly done)

actually you need to add a 680 ohm dropper resistor since the gbs max voltage on inputs is 3.6v

Ok so without the 680 ohm resistor I get "No signal" but with it the picture is all jumpy seems like the vertical sync is off. I checked and the sync line was still 4.4 volts with the 680 ohm resistor so I added a 220 ohm in right after the 680 and Boom! the video looks great!

Thanks for your help!

[kynrek]

The Mod was successful!

Anyone know could be causing the white bleeding on the right of the logo?


or these faint diagonal waves?