Hello, I have recently watched a show on Netflix called 'Halt and catch fire' and i would like to purchase an older computer possibly off Ebay or online store. Lets say i wanted to buy a Commodore 64. What important info would i need to know besides that it powers on.....some of the Commodors they were selling looked like they did not have original software. Any technical terms for me to look for?I would like to find as original as possible and would the commodore be a good retro computer to find, or should i look for AN IBM or a Compaq? I want to learn how the original software on these machines work and operate and what the insides look like, I am finding the old computer a hobby that i would really like to get into. THANKS