The “famous” 10PRINT program on vintage computers was a delight for many in the 70s and 80s. It’s fun to port to other platforms and machines. I’m always looking for calculators that can do it. It requires both a slash - ASCII character 47, and a backslash - ASCII character 92. Most calculators can print the forward slash, but the backslash is only sometimes implemented. No one is surprised; calculators have limited space, and printing random patterns isn’t a primary function for standard use cases.