I'm looking at pictures of boards. They don't have the same slots I used to use for cards that added sound or whatever.
If you're speaking of PCI cards and/or AGP cards, those slots are no longer in production.
I state this cautiously, as there may be the occasional motherboard (probably server boards) that MIGHT still use PCI slots, but for the general "home user" market, NOBODY is putting out PCI slots anymore.
The slot in use nowadays is called PCI Express, sometimes abbreviated PCIe.
PCIe slots are FAR BEYOND what PCI slots were.
PCI Express slots all use the same basic architecture, and they come in PCI Express x1, x4, x8, and x16 slots. X16 slots, for example, are pretty much relegated to video card use.
But here's what's great about PCI Express. If you have a PCI x1 card, you can use it in ANY slot it will fit. So you can use an x1 card in an x1 slot, or you can also use it in an x4, x8, or x16 slot. Likewise, an x4 card can be used in an x4, x8, or x16 slot, but not an x1 slot because it physically won't fit.
Everything about PCI Express is better than PCI. The death of PCI isn't something we should lament, it's something we should celebrate. And any card you might have installed into a PCI slot they make modern PCI Express versions of. Such as the Creative Labs Sound Blaster Z SE, which is a PCI Express x1 sound card.