There are adapters that will allow old Canon FD-mount lenses, such as the ones you have, to mount on an EF-mount camera (which includes all of Canon's digital SLRS and all of their film SLRs since 1987); however, these adapters do have limitations.
1. Metering becomes a bit more complicated. You have to keep the aperture at the widest setting in order to meter, and then when you want to take the picture, you have to manually set it back to the desired aperture. This is in addition to focusing manually, of course. Then you have to repeat the process every time you take a shot. Needless to say, this adds a couple of extra steps that you wouldn't have had to do with your F-1... which means that taking a shot is going to take longer... which means that it's not going to be ideal for moving subjects. For still life, however, it's not so bad. My Pentax DSLR allows me to use lenses dating back to the 1950s. The "stop down metering" process, as described abovep, takes a little getting used to, but for things like flowers and plants and architecture, it's not bad. I'd never bother with it for trains, sports, kids, or things like that.
2. Because of the size differences between the old FD mount and the newer EF mount, there are two types of adapters available. One adapter does not contain any additional glass optics, which means it offers the best image quality, but the catch is that you won't be able to focus to infinity. This isn't so bad when you're focusing on objects that are close to you, but for things that are far away, you're screwed. The other type of adapter contains additional glass elements that allow the lens to focus to infinity. The catch there is that you're degrading the image quality somewhat. Your super-sharp Canon FD 50/1.4 might not be super-sharp anymore. The adapters that allow infinity focus can also be very expensive, sometimes costing more than what your lens is worth.
Long story short: what you're proposing is possible, but it isn't without limitations and compromises. Depending on what you're planning on taking pictures of, those limitations may or may not be bothersome. For example, taking macro closeup shots of flowers would be a very viable use of your old FD-mount lenses on a Canon DSLR. Landscapes and moving objects? Not quite as viable.
Here is an article that you might find useful. You'll note that in many cases, it's a bit easier to adapt non-Canon lenses to a Canon DSLR than it is to adapt Canon lenses. Quite the irony!
http://www.bobatkins.com/photography/eo ... s_EOS.html