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Chapter 3 - Chapter 3 RAM I RAM a b c d Random Access...

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Chapter 3 RAM I. RAM a. Random Access Memory b. Working memory in the computer c. When a program is loaded windows copies the program in RAM d. Any part of the RAM can be accessed II. DRAM a. Dynamic Random Access Memory b. A special type of semiconductor that stores individual 1’s and 0’s III. Organizing DRAM a. standard RAM used in all computers i. low cost, high speed, capability to contain a lot of data on small package b. need RAM to store data in 8-bit chunks for 8088 processor (8-bit external data bus) c. CPU needs memory to store programs and data in 8-bit(1-byte) chunks i. byte-wide memory (memory in PC) d. two values (units of bits) – combined: get size of DRAM i. depth (also called height) ii. width iii. depth K(bit) x width (bit) e. impossible to tell size of DRAM by looking at it i. can be different inside but look the same ii. only can tell by reading info printed on chip (cant decipher info) IV. A Historical Look a. original IBM PC – 640KB DRAM (most) b. “Everything old is new again.” c. 1-bit wide (old days) d. organized with the memory controller chip
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e. made 1-bit wide DRAMs to look like 8-bit wide DRAM i.
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