7-64.
The main advantage of direct memory
access is which of the following?
1. Speed
2. Reliability
3. Less complicated circuity
4. Maximum utilization of memory
7-65.
When the CPU and the DMA attempt to
access main memory simultaneously, the
CPU has priority.
1 . T r ue
2. False
7-66.
When a high speed disk drive is used,
output data will be in which of the
following forms?
1. Octal
2. Binary
3. Octal coded decimal
4. Various; form is dependent on type of
interface used
7-67.
The technique used when more than one
peripheral device is connected to a single
port/channel is known by which of the
following terms?
1. Daisy chaining
2. Independent request control
3. External interrupt control method
4. Request/acknowledge control method
7-68.
When more than one peripheral device is
connected to a single port/channel, the
priority of a device is determined by which
of the following factors?
1. The CPU
2. The I/O controller
3. The computer program
4. The order of connection
60
7-69.
When using a request and acknowledge
system, the priority of the fictions and
channels is determined by which of the
following factors?
1. The CPU
2. The I/O controller
3. The computer program
4. The order of connection
7-70.
Communication formats are governed by
which of the following items?
1. The type of external equipment
2. The speed of the external equipment
3. The interfacing standard
4. The speed of the computer
7-71.
The compatibility of voltage levels
between the computer and external
equipments is ensured by which of the
following means?
1. The CPU
2. The I/O processor
3. The I/O interfacing components
4. The type and number of pins in the
cable connectors
7-72.
Transfer of data within a digital computer
is accomplished internally using which of
the following means?
1. Standard I/O interfaces
2. Serial format
3. Parallel format
4. Serial interface board
7-73.
The conversion of data for transmission
over a serial channel is accomplished by
which of the following means?
1. A serial interface board
2. A standard format interface
3. A universal receiver-transmitter
4. I/O control printed circuit board
