Yes, you can do all of that and there would be no advantage to using Designer. You could create a simple function to convert a digit to the binary representation. If you need help with the scripting, post again.
Yeah, I would definately need help with the scripting. JS insertion into a PDF is not my strong suit
Looking back at it again, well, I guess I need to present the user with an empty eight position comb in a numeric box. The user inputs eight octal values and receives a 24 bit binary equivalent in a seperate box underneath the comb.
The creation of a form like this would be nothing short of amazing in my line of work. I mean, I can chase binaries all day, but I have to pass the technique to youngsters that have never seen it before. A PDF works in their smartphone and if the device tells them what the binary is, they'll believe it.
Thanks again Mr. Johnson,
Here's a quick & dirty sample that should get you started: https://workspaces.acrobat.com/?d=PNfGMfQ22gKjx1JIoPbLoQ