The tablet itself would probably work on a 486 pc, but the software your drawing with is another story. And the resolution you use and colour and a lot of shit. Basically the faster the better. The more detailed the work the more processor and graphic card you will need ;_;
You'll be fine My computer is pretty old and isn't really.. well.. good, fast, etc. But I'm able to run Paint tool SAI smoothly, and I'm able to draw smoothly. So I don't think you'll need a good computer
A good computer would be nice for sure, but it's not required, I have a 7-yr-old computer with a 1.8GHz Sempron 3400+, 1.5GiB RAM, ATI Radeon Xpress 1150, 80GiB HDD, and Archbang, and GIMP, MyPaint, Inkscape, Pinta, and Synfig seem to work fine on it.
A normal tablet, probably not. A cintiq though that would be limited by your graphics card, I'm assuming you can't afford one of those as your first tablet so the only issues you'll have are with the programs instead. Like you might not be able to fluidly use brushes that are a few thousand pixels wide, and processes that require more computing power will have lag on them. But that's a program issue, not a tablet hardware issue.
My old laptop was pretty shitty, and it could work a tablet like a charm. It doesn't matter much. However it does affect how well your drawing programs run. But if they run smoothly as you said in your thread, a tablet won't be a problem.
Hmm... Tablet and Photoshop, for example (as software for tablet), have extremelydifferent requirements. I said, that tablet consume very small part of CPU power. If you're using very old computer, which have windows 98, would be hard to run newest photoshop on it So yes, there will be a problem with compability then. But we're not talking about soooo old devices, so I think there is no need for checking system requirements for software you byuing (provided that we're talking about 2D all the time).
By the way. I have second computer with 768mb of ram, CPU sempron 1.6, geforce 2 and windows XP. Believe or not. All kind most popular graphic programs are working
Ohh. That's good point! I had XP, 1GB (or from what they said, less) ram, and around 60GB of space and it kind of froze my working on photoshop sometimes and completely stopped letting me render videos. Had to get an external harddrive and notch up the ram afterwards for it to run. Had to get the hard drive fixed afterwords as it got ruined for some reason ( BSOD) and now running Windows 7. And this old video editing program becomes wonky sometimes as well since they don't have allow it for this old system anymore. Other things work!
Not that high quality videos. Home videos. But yea, it got solved soon afterwords. Along with being able to run Photoshop (and having enough space to save them to boot). Even moderate sizes of working took some time to work with.