[1] : The Free On-line Dictionary of Computing (27 SEP 03)

xt bus architecture
     
         after the ibm pc xt an eight-bit
        isa bus architecture used by intel 8086 and intel 8088
        systems in the ibm pc and ibm pc xt in the 1980s.  it
        predates the 16-bit isa architecture used on the intel 80286
        based machines.
     
        the xt bus has four dma channels, of which three are brought
        out to the expansion slots.  of these three, two are
        normally allocated to machine functions:
     
         dma channel  expansion	 standard function
         0	      no	 dynamic ram refresh
         1	      yes	 add-on cards
         2	      yes	 floppy disk controller
         3	      yes	 hard disc controller
     
        1997-09-15
     
     
see also:
ibm pc xt isa intel 8086 intel 8088 ibm pc intel 80286 
dma expansion slots dynamic ram floppy disk hard disc 

Architecture >> A Words
Architecture, definition of term: Architecture
architecture_pag1.html

Address Bus >> A Words
Address Bus, definition of term: Address Bus
address+bus_pag1.html