1. Most popular bussystems
Internal
ISA / EISA
VLB
PCI
AGP
External
USB
Firewire

2. ISA (1980) (Industry Standard Architecture )
8-bit bus
16-bit bus (compatible to 8-bit)

3. ISA (1980) (Industry Standard Architecture )
Graphiccards
Controllercards (storage)
Networkcards (MoDem, LAN)
Soundcards
Serial & parallel ports (com, lpt)
Replaced in new systems (PCI-bus)

4. EISA (1988) (Extended Industry Standard Architecture )
Extension of ISA-Standart
Bus-Mastering (direct communication between cards)
Mainly used in Servers or network-hosts
Compatible to ISA-Standart
32-bit EISA slot
16-bit ISA slot

5. Vesa-Local-Bus (VLB) (1992) (Video Electronics Standard Association)
Compatible to ISA-standart
32-bit bus
Mainly used for graphic- and videocards
extension of the 486 processor/memory bus (only used in 486er systems)
Not established due to PCI-system in connection with the Pentium-CPUs.

6. PCI (1993) (Peripheral Component Interconnect)
Actual system standart
32 and 64 bit bus (with Bus-Mastering)
First system controlled by the mainboards chipset
Usable for nearly all device cards

7. AGP (1997) (Accelerated Graphics Port)
64 bit bus
Used only for graphiccards
different modes:
1x standart
2x double data rate per clock
4x quad data rate per clock
ability to share the main system memory with the video chipset

8. External Bus Systems USB 1.1 USB 2.0 Firewire 1 (i-link, IEEE 1394)

9. USB 1.1 / 2.0 (Universal Serial Bus)
Hot plug Capability
Hot swap (PNP)
Built-in in all newer PCs
Built-in Power supply
Bandwith (max.):
USB 1.1: Mbit / sec
USB 2.0: Mbit / sec

10. Firewire 1 & 2 Hot plug capability Hot swap (PNP)
Without power supply
With power supply
Hot plug capability
Hot swap (PNP)
Requires additional controller
Built-in Power supply
Bandwith (max.):
Fw 1: / 200 / 400 Mbit / sec
Fw 2: up to 3,2 Gbit / sec

11. Thanks for listening
Feel free to ask questions

12. Sources http://www.pcguide.com/ref/mbsys/buses/types/index-i.htm