Local buses -  
  Once CPU > 8MHz., it(CPU) was separated from the i/o bus. 

  Memory and Video were only devices that attempted to keep up with CPU.

  VL-Bus (VESA-Local or video-local) is an expansion of the ISA bus (again).
    Early versions were somewhat proprietary.

    1992-1994 standardized. Modeled after EISA

  VESA - Video Electronics Standards Association.

  Faster.
    Used for memory and video access.

    Standard ISA still existed on the system but isolated from faster bus.

  32 bit data bus.  33 MHz.

  133MB/s throughput max.

  Tied into the 486 CPU and used the processor bus directly.
    (Used exactly same control/handshake lines as CPU) Easy to interface.

    However, different speed 486 CPUs caused incompatibilities with cards. 
    (Other CPU models had different control/handshake lines)  

  112 contacts (many were ground to guard against data corruption).
    Same connector as MCA.