7-20. In the example, the ROM chip memory array has a
total of (a) how many decoders and (b) how many
lines are input to these decoders?
1. (a) 2 (b) 12
2. (a) 2 (b) 13
3. (a) 4 (b) 12
4. (a) 4 (b) 13
7-21. ROMs may be made of which of the following
materials?
1. Hardwired and magnetic only
2. Fusible links only
3. MOS and bipolar transistors only
4. Hardwired, magnetic, fusible links, and MOS
and bipolar transistors
7-22. To perform ROM operations, which of the
following circuits are used?
1. Timing and control signals only
2. Registers, flip-flops, and internal buses only
3. Internal buses, timing, and control signals only
4. Timing, control signals, registers, flip-flops,
and internal buses
7-23. Compared to PROM, an erasable PROM has what
additional advantage, if any?
1. It can be used over and over again without
reprogramming
2. It can be erased and reprogrammed
3. It can be field programmed by an authorized
technician
4. None, there is no additional advantage
7-24. While still in the circuit, which of the following
PROMS can (a) be programmed and (b) erased?
1. (a) EAPROM/EEPROM
(b) EAPROM/EEPROM
2. (a) EAPROM/EEPROM
(b) UV EPROM
3. (a) UV EPROM
(b) EAPROM/EEPROM
4. (a) UV PROM
(b) UV PROM
7-25.
7-26.
7-27.
7-28.
7-29.
A device that serves as a shared entry point from a
local-area network into a larger information
resource is which of the following?
1. Gateway
2. Input/output adapter (IOA)
3. Input/output controller (IOC)
4. Data terminal equipment (DTE)
A function that transfers status by using the
appropriate control signals from a transmitting
device to the receiving computer is which of the
following?
1. Input data (ID)
2. Output data (OD)
3. External function (EF)
4. External interrupt (EI)
The I/O processor controls which of the following
transfers?
1. The transfer of data between registers
2. The transfer of information between main
memory and the CPU
3. The transfer of timing signals between the
ALU and the CPU
4. The transfer of information between main
memory and the external equipments
Establishing, directing, and monitoring transfers
with external equipments are the functions of
which of the following devices?
1. C P U
2. IOA
3. IOC
4. Bidirectional bus
Changes to input and output control and data
signal voltages are functions of which of the
following devices?
1. CPU
2. IOA
3. IOC
4. Bidirectional bus
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