12-5. A computer employs RAM chips of 256 × 8 and ROM chips of 1024 × 8. The computer system needs 2K bytes of RAM, 4K bytes of ROM, and four interface units, each with four registers. A memory-mapped I/O configura- tion is used. The two highest-order bits of the address bus are assigned 00 for RAM, 01 for ROM, and 10 for interface registers. a. How many RAM and ROM chips are needed? b. Draw a memory-address map for the system. c. Give the address range in hexadecimal for RAM, ROM, and interface||

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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12-5.
12-6.
A computer employs RAM chips of 256 × 8 and ROM chips of 1024 × 8.
The computer system needs 2K bytes of RAM, 4K bytes of ROM, and four
interface units, each with four registers. A memory-mapped I/O configura-
tion is used. The two highest-order bits of the address bus are assigned 00
for RAM, 01 for ROM, and 10 for interface registers.
a. How many RAM and ROM chips are needed?
b. Draw a memory-address map for the system.
c. Give the address range in hexadecimal for RAM, ROM, and interface
An 8-bit computer has a 16-bit address bus. The first 15 lines of the address a
used to select a bank of 32K bytes of memory. The high-order bit of the address
is used to select a register which receives the contents of the data bus. Explain
how this configuration can be used to extend the memory capacity of the sys-
tem to eight banks of 32K bytes each, for a total of 256K bytes of memory.
Transcribed Image Text:12-5. 12-6. A computer employs RAM chips of 256 × 8 and ROM chips of 1024 × 8. The computer system needs 2K bytes of RAM, 4K bytes of ROM, and four interface units, each with four registers. A memory-mapped I/O configura- tion is used. The two highest-order bits of the address bus are assigned 00 for RAM, 01 for ROM, and 10 for interface registers. a. How many RAM and ROM chips are needed? b. Draw a memory-address map for the system. c. Give the address range in hexadecimal for RAM, ROM, and interface An 8-bit computer has a 16-bit address bus. The first 15 lines of the address a used to select a bank of 32K bytes of memory. The high-order bit of the address is used to select a register which receives the contents of the data bus. Explain how this configuration can be used to extend the memory capacity of the sys- tem to eight banks of 32K bytes each, for a total of 256K bytes of memory.
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