Here is a pinout for making a pseudo analog dreamcast controller. This will map Y A X B, to, Up Down Left Right. At the moment I know this to only be useful for the game Bangai-O with firing directions changed in game settings.
I used a 360 stick because thats what I had 10 years ago. If there is a smaller stick out there now that uses the same type of dual pot design, please post it in the comments because there isnt a lot of room for placing the stick in the DC controller. Plus it sticks out kinda high.
You will also need a small variable resistor. I use one of those small ones that solder in a motherboard. Set the variable resister to 6.34 kohms and adjust if needed. You should be able to use normal resistors but i used this to test and I kept it in. Also, i got this reading off of a cheap multimeter so it may not be 100% accurate (another reason why I am suggesting the variable resistor). The resistor is used to connect the ground from the DC controller to the two 5V connections on the 360 sensor. I just bridge the 5V connections.
Im using ceramic coated wire in the one picture ................ I do not recomend that lol. Just use normal wire.
Yikes!! Isn't it great looking at your shitty solder work from over 10 years ago lol.
Im sharing this in response to a comment on this thread. I thought I'd share how I smooth out the analog control :
Also, here is another much better mod :