Comparison between 8086 and 8088, Assembly Language

Comparison between 8086 and 8088

All the changes in 8088 above 8086 are indirectly or directly related to the 8-bit, 8085 compatible data and control bus interface.

1) The predecoded code queue length is reduced to 4 bytes in 8088, whereas the 8086 queue have 6 bytes. This was done to get ride from the unnecessary prefetch operations and optimize the use of the bus by BIU when prefetching the instructions.

2) The 8088 bus interface unit will fetch a byte from memory to load the queue each time, if at least one byte is free. In case of 8086, at least two bytes should be free for the next fetch operation.

3) The whole execution time of the instructions in 8088 is affected by the 8-bit external data bus. Now all the16-bit operations require additional 4 clock cycles. The CPU speed is also restricted by the speed of instruction fetches.

 

The pin assignments  of both the CPUs are closely identical, however, they have the following functional changes.

1.) A8-A15 already latched, every time valid address bus.

2. ) BHE has no meaning as the data bus is only of 8-bits.

3.) SS0 provides the S0 status information in  theminimum mode.

4.) IO/M has been inverted to be compatible with 8085 bus structure

 

Posted Date: 10/10/2012 4:04:01 AM | Location : United States







Related Discussions:- Comparison between 8086 and 8088, Assignment Help, Ask Question on Comparison between 8086 and 8088, Get Answer, Expert's Help, Comparison between 8086 and 8088 Discussions

Write discussion on Comparison between 8086 and 8088
Your posts are moderated
Related Questions
a program that display English letters excluding vowels

what will be the value of EAX after following instructions execute? mov bx, 0FFFFh and bx, 6Bh

Write a nonrecursive version of the Factorial procedure (Section 8.3.2) that uses a loop. (A VideoNote for this exercise is posted on the Web site.) Write a short program that inte

what is the hex value in ax after executing the instructions ax= 1E8A bx=4080 add al,bl sub ah,bh

REP : Repeat Instruction Prefix :- This instruction is utilized as a prefix to other instructions. The instruction in which the REP prefix is provided, is executed repetitively

General Data Registers Given figure indicate the register organization of 8086. The registers DX, CX, BX and AX are the general purpose 16-bit registers. AX is behaved as 16-bi

8088  Timing System Diagram The 8088 address/data  bus is divided  in 3 parts (a) the lower 8 address/data  bits, (b) the middle 8 address bits, and (c) the upper 4 status/

write shell to calculate basic salary from given .

i want to develop traffic light system so which kind of software is needed to develop this project?

There are 3 kinds of OCWs. The command word OCWI is utilized for masking the interrupt requests; when the mask bit corresponding to an interrupt request is value 1, then the requ