single device. The AGP slot (see Figure 19-15)—there is usually only one on a
motherboard—is reserved for the graphics card.
ISA (Industry Standard Architecture) The ISA expansion bus (pronounced
“eye-ess-aye,” not “ice-a”) is now generally obsolete, but most motherboards
still have at least one ISA slot to provide backward compatibility for older
hardware. You can still buy ISA expansion cards, but they are becoming hard
to find. On most motherboards, the ISA bus slots are 16-bit that will also support
8-bit cards. Older video cards use ISA, but because it is an 8-bit architecture, it
cannot support the speed and throughput demanded by modern video adapters.Chapter 19: Ports and Connectors^501
Figure 19-15. A motherboard with PCI and AGP interface slots
PCI ports AGP slot