Question 3
- (a) Match (with pointed arrow) each of the following computing devices with its uses.
COMPUTING DEVICE |
USES |
|
Electronic digital stored-program computer intended for the bureau of census and later for presidential election. |
Electronic digital stored-program computer for calculation of table of squares and list of prime numbers. |
|
Electronic computer, binary in nature with automatic addition, subtraction, multiplication and programmed division. |
|
Electronic general-purpose computer programmed to perform complex sequences of operation. |
(b) List:
(i) three types of register in the control unit;
(ii) four types of register in a microprocessor.
Observation
(a)
COMPUTER DEVICE |
USES |
(i) ENIAC |
Electronic general-purpose computer programmed to perform complex sequences of operation. |
(ii) UNIVAC 1 |
Electronic digital stored-program computer intended for the bureau of census and later for presidential election. |
(iii) EDVAC |
Electronic computer, binary in nature with automatic addition, subtraction, multiplication and programmed division. |
(b) (i) TYPES OF REGISTERS IN THE CONTROL UNIT
- Memory Data Register (MDR)
- Current Instruction Register (CIR)
- Sequence Control Register (SCR)
(ii) TYPES OF REGISTERS IN THE MICROPROCESSOR
- Temporary register
- Permanent register
- Program counter register
- Address register
- Instruction register
- Index register
- Data register
- Stack pointer register (SPR)
- Condition code register
- Accumulator register
- Interrupt control register
- Flag register
Candidates were required to identify 20th century computing devices and state the types of registers used in control unit and microprocessors respectively.
Candidates demonstrated poor knowledge of history of computers. Most of the candidates avoided questions on types of registers.