计算机程序员笔试题

  1. Simplify the following Boolean expression

　　!((i ==12) || (j > 15))

　　2. How many flip-flop circuits are needed to divide by 16?

　　3. Provides 3 properties that make an OS, a RTOS?

　　4. What is pre-emption?

　　5. Assume the BC register value is 8538H, and the DE register value is 62 A5H.Find the value of register BC after the following assembly operations:

　　MOV A,C

　　SUB E

　　MOV C,A

　　MOV A,B

　　SBB D

　　MOV B,A

　　6. In the Assembly code shown below

　　LOOP: MVI C,78H

　　DCR C

　　JNZ LOOP

　　HLT

　　How many times is the DCR C Operation executed?