Seanaldinho
Pattern Altitude
I've seen use of strips and scratch paper. And a few controllers I have met have it wired well enough to just use memory.
DTO (Class D) has radar display off of the feed from DFW. If you're on an IFR plan or FF, then your tail# appears as part of your target.
The strips are required and are a legal document. They stay in the system for 3-4 months should something happen.
As I said earlier you may not be able to get into a facility for a little while.