The TechNet Wiki Editor has a Format Code Block option ().
Click it, insert some code, select a language, click Preview to see it, tweak the code, and then click
OK. The source code is now formatted and into your article!
To add line numbers on the left side of your code, click the checkbox in the middle,
Display Line Numbers.
Clicking the Format Code Block button opens the following popup window. But there is no option to select the Small Basic programming language. See
Small Basic: How to Format a Code Block.