首先 先感謝各位大德 幫小妹解題 >.< 1.Which of the following companies is best know for producing PC-compatible systeam units? (A)apple (B)Microsoft (c)Motorola (d)Compaq (e)Corel 疑惑:這題不是說哪家公司所做出的電腦 電腦系統相容性最好? 其實我二話不說 就選B 但是答案卻是D 上網查了一下 除了發現他是個電腦公司外 <原本不知-.-> 還有一些歷史 還是搞不董.. 2.<91年台大> The basic assumption behind caching is (A)data/file is accessed will be accessed again (B)data/file that is recently accessed has high probability to be accessed again (C)data/file that is recently accessed will be accessed again (D)data/file that has not been accessed for a long time will likely to be accessed again (E)data/files are generally shared 這題完全不知道他在說什麼-_- 首先caching我不知道他在說啥-.- 希望有大大可以 幫我解釋解釋..答案是B 3.A machine cycle consists of two segments of time;instruction time and execution time. Which one is mainly used in the execution time ? (A)floating-point unit (B)decoder (c)system bus (d)cache 答案竟然是A ..完全沒看過>.< 4.A 16-bit CPU with 16M byte a addressing is equipped with 256K X1 bit DRAM as the system main memory. The minimum memory storage capability of the system is_________ 唉 不是看不懂 只是不知道如何下手.. 5.If we have an error correcting code present as: Symbol Code A 00000 B 11000 C 01111 D 10011 (a)Could errors have corrected in the following message (i)10001 (ii)01001 (iii)11001 (iv)01101 這題答案寫的很簡短 我知道漢明碼檢查法 對於一個位元以上的錯誤 就無法更正了 而我是看答案才知道原來是ABCD裡面要跟下面四個作互相檢查的動作 ex:A與i 我的想法先由A與i這個組合開始 即檢查00000 10001是否可以更正利用漢明碼 8 4 2 1 1 0 0 0 0 2 0 0 0 0 3 0 0 0 0 4 0 0 0 0 5 0 0 0 0 6 0 1 1 0 7 0 0 0 0 8 0 0 0 0 9 0 0 0 0 10 1 0 1 0 ___________________ 1 1 0 0 轉成十進位 為12 課本有另外例題說算出來是3 然後說是第三個bit 錯誤 ..但是現在這算出來是12 可是沒有第12位元該怎麼辦 >.< 小妹先問到這裡 麻煩各位大大了 囧.. --

※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 59.125.8.163