ibm pc at
     
         "advanced technology" a version of the ibm pc,
        released in aug 1984 with an intel 80286 processor, a 16-bit
        bus, a medium-speed hard disk and a 1.2 megabyte
        floppy disk drive.  it had a larger case than the pc,
        which allowed it to accept "tall cards".
     
        the at keyboard corrected the pc's non-standard placement of
        the return and left shift keys but shortened the backspace
        key, making it harder to reach.
     
        1995-03-01
     
     
see also:
ibm pc intel 80286 bus hard disk megabyte floppy 
disk drive tall cards return backspace