I know your message is very old, but im hoping you are still around.
My Great-grandfather was a Texas Prison from 1902 - 1909. He was pardoned by the Governor in 1909 and I was able to find those records at the Texas State Archives in Austin. As I live in Delaware, I had to hire someone to go there and get the records for me, but it only cost about $12.00. Well worth it. I learned so much about him.
I am now on more of a quest myself. To find the criminal trial records from 1902. I am emailing people like crazy. Hopefully will get some answers. If I come up with anything, I will let you know