A Universal Pro slot can hold either 3.3-V or 1.5-V cards. There fore it has no notches to prevent either card from fitting.
Info gathered from
CompTIA A+ Guide To Managing & Maintaining Your PC, 6th Edition
Page 388
AN AGP universal slot has no notches so it can fit different AGP standard video cards.
While I'm sure a destructive lunatic could force a DDR module into an older slot, they are not designed to be physically compatible. DDR modules have only a single notch, while SDR modules and slots are keyed with two notches and ridges.
it will be written in the upper left hand corner of the cardYou can also tell by the location of the notches on the bottom of the card.A notch in a PCI slot distinguishes between a 5-V slot and a 3.3-V slot. A Universal PCI card can use either a 3.3-V or 5-V slot and contains both notches. Conventional PCI now has four types of slots and six possible PCI card configurations to use these slots.
so they fit correctly into an 8bit or 16bit slot
Yes. Keep in mind that not all motherboards will have an AGP slot. If you are not sure what slot type you have, purchase a model that is keyed for both 3.3v and 1.5v voltage.
The slot on a PSP the game goes into called a Universal Media Disc a disc format created by Sony for the PlayStation Portable
Memory modules will have a small notch in the bottom edge that ensures it can only be inserted into a slot one way.
A keyed shaft or Keyway is method, based on a machined keyway in shaft, to attach something to the shaft and associated bore. A fitted key is inserted into a slot that is machined into the shaft. Although a machined keyway does result in a weaker shaft, it has it's applications. As in a lawn mower engine shaft. Theoretically the key will give way and save the shaft if you hit something with the blade. The negatives of a keyed shaft are that it can be deformed over time and result is a loose drive.
The 8-bit slot had 62 pins. The 16-bit slot had an additional 36 pins.
Universal AGP3.0 card
DDR Memory modules have only one notch on the contact strip, positioned just off-centre. Hence DDR modules will not fit in an SD slot. SD Memory Modules have two notches.
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