hua :
I like to upgrade an old Gateway ATXSTF PC with new hardware using the same chassis if possible.
The current motherboard measures 200mm x 350mm, which doesn't seem to be a standard. Does anyone have experience with upgrades using the Gateway chassis? Would the microATX, for example, fit this chassis?
Any help or suggestion would be greatly appreciated!
Hua
Actually it's a REALLY STANDARD ATX motherboard. It's not full width, but full-width boards will fit the case. The reason I say "really standard" is because it has a Mars design port layout.
Mars design boards used to be the default standard most companies use, but everyone deviated to get more USB ports, FireWire ports, etc after it was released. The last MARS design boards I've seen were budget products.
Here's a picture of a MARS layout motherboard and backplate
http://www.pctechguide.com/images/tutorials/MBoard/IOPanel.jpg
The backplate on the photo above has "knock-out" tabs for opening the joystick and audio holes. Your case is already pre-cut and has a thick sticker covering the unused holes: You can cut holes in the sticker to fit additional ports by simply tracing the hole in the metal beneath with a sharp knife.
So, now all you need to do is find a board with MARS style ports. To do that, you have to look at photos. Loads of photos. And using the word MARS won't help, because it's a "forgotten" term.
Good thing you didn't have a Venus board!