January 2021

1.       Which processor did Zilog produce: (a) Z80 (b) 6502 (c) 8080 (d) 6800 2.       Which processor did MOS Technology produce: (a) Z80 (b) 6502 (c) 8080 (d) 6800 3.       Which processor did Motorola produce: (a) Z80 (b) 6502 (c) 8080 (d) 6800 4.       Which processor did the Apple II use: (a) Zilog Z80 (b) […]

1.       Which processor did the ZX80 use: (a) Zilog Z80 (b) MOS Technology 6502 (c) Intel 8080 (d) NEC 780- 2.       Which company distributed CP/M: (a) Microsoft (b) Digital Research (c) Xerox (d) Applesoft 3.       Which software language was standard on most early PCs: (a) C (b) BASIC (c) Pascal (d) Assembly Language. 4.       How

1.       Which type of memory requires its memory of be refreshed at regular intervals: (a) EPROM (b) ERAM (c) DRAM (d) SRAM 2.       If a processor can operate on four bytes at a time, which is its classification: (a) 8-bit (b) 16-bit (a) 32-bit (b) 64-bit 3.       Which of the following defines the amount of

Explain, with reference to the level-1 cache, the level-2 cache and DRAM, how the processor accesses memory. What advantage does level-1 have over level-2 cache, and what advantage do these have over DRAM. Discuss the power management modes supported by the PXII3, and also by the PXII4. Which interrupts are supported with the AIP and

1.       What is a typical data capacity for a CD-ROM disk: (a) 100 MB (b) 650 MB (c) 800 MB (d) 1 GB 2.       Which interface is most often used in PCs to connect to hard-disk drives: (a) ST-506 (b) ISA (c) EISA (d) IDE 3.       Which bus does the IDE share many of its

1.       What is the base address for the secondary IDE controller: (a) 1F0h (b) 170h (c) 2F0h (d) 270h 2.       What is the main advantage of E-IDE over IDE: (a) It is compatible with more hard-disk drives (b) It allows for larger hard-disk capacities (c) It is easier to interface to (d) It has a

1.       Which IRQ does an IDE connected disk drive normally use and what is the size of its data bus. 2.       A floppy disk ribbon cable has a cable twist to differentiate between the A: drive and the B: drive. How does the ribbon cable that connects two IDE connected drives differ. In addition, how

How are I/O addresses used to communicate with hard disks. How is data transferred to and from the disk? What are the standard address ranges for the primary and the secondary? If possible, check these on an available PC. Which register is used to identify a hard disk error. Explain its operation. Which is the

What is the maximum number of devices that can connect to a standard SCSI bus: (a) 1 (b) 4 (c) 7 (d) 8 How many data bits does the SCSI-I bus use: (a) 8 (b) 16 (c) 32 (d) 64 How many data bits does the SCSI-II fast/wide bus use: (a) 8 (b) 16 (c)

1.       The transfer clock for a SCSI bus is 20 MHz. Which is the transfer rate for a 16-bit data bus: (a) 10 MB/s (b) 20 MB/s (c) 40 MB/s (d) 80 MB/s 2.       Explain the main differences between SCSI-I, SCSI-II and ultra SCSI. Outline their maximum data throughput, the connectors used and the size