An internal channel from the
CPU (Central Processing
memory across which the addresses of data (not the data) are transmitted. The
number of lines (wires) in the address bus determines the amount of memory that
can be directly addressed as each line carries one bit of the address.
example, a 20-line address bus represents the binary number 1,048,576 and
reaches that number of memory bytes (the size of the address bus in the
IBM PC in 1981). A computer with a 32-bit address bus can directly address
4GB of physical memory, while one with 36 bits can address 64GB.
When Tim Paterson became the "father
of DOS" at the age of 24 it should not have come as a great shock to anyone
who knew him well. Growing up with a father who was an electrical engineer says
Paterson, "I got a lot of exposure to electronics stuff at home." He also says
that he learned a lot by reading and simply by experimenting on his own. It was
not until he went off to the University of Washington, however, that he first
came into contact with PC's. His roommate bought one and let him play around
with it. At the same time, Paterson was working as a technician at a retail
computer store in the Seattle area. This position allowed him to begin trying
to design his own computer boards. more...