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Is debugging a computer something that a layperson could learn how to do, or do you need to know a lot about computer programming and languages before you can attempt to debug?
Do you want to debug computer hardware or application?
If you want to Debug Computer hardware you can use A Debug Card (Price $20-$30) Then put it on your PCI slot/ISA slot, it depends on your computer models(ISA/PCI)
For debugging an application, you can use program called debug
Runs Debug, a program testing and editing tool.
DEBUG [[drive:][path]filename [testfile-parameters]]
[drive:][path]filename Specifies the file you want to test.
testfile-parameters Specifies command-line information required by
the file you want to test.
After Debug starts, type ? to display a list of debugging commands.