The 8085 instructions are specified with opcode, operand, instruction size, M-cycle, T-cycle etc. In 8085, the length is measured in terms of “byte” rather then “word” because 8085 microprocessor has 8-bit data bus. 8085 is pronounced as "eighty-eighty-five" microprocessor. Memory Interfacing in 8085: Memory is an integral part of a microprocessor system, and in this section, we will discuss how to interface a memory device with the microprocessor. For 8085 there are 2^16= 64 Kbytes memory size. It is an 8-bit register used to perform arithmetic, logical, I/O & LOAD/STORE operations. 8085 has address bus of 16 bit, so it can index 2^16B . The general formula is 2^n, where n= number of address lines.

A bus is just a group of connections that all share a common function. This 8085 microprocessor tutorial covers following sub-topics: 8085 architecture 8085 programming instructions 8085 vs 8086 This page covers 8085 instruction set. 1024*8 means that you have: * 1024 locations * 8 bits per location Address Lines: Assuming that number of address lines (address bits) is n, how can we find n?
The memory location of 8085 microprocessor can accommodate 8-bits of data. The stack size of Intel's 8085 microprocessor is theoretically 64 kb, but the real limit is a function of memory and program architecture and layout. The memory size of any microprocessor depends on the number of address lines. First 64 bytes in a zero memory page should be reserved for vectors used by RST instructions. The 8085 microprocessor has 5 interrupts. There isn’t even any cache on board the 8086. The 8085 microprocessor is an 8-bit processor available as a 40-pin IC package (shown the figure below) and uses +5 V for power. Interrupts. It is an 8-bit microprocessor designed by Intel in 1977 using NMOS technology. There isn’t even any cache on board the 8086. Instruction Word Size in Microprocessor The 8085 instruction set is classified into 3 categories by considering the length of the instructions. 2 Requirement and memory structure • There are two types of memory: – RAM: read and write – ROM: read only • Figure 1a shows the R/W memory chip: – 2048 (2k) size. It is connected to internal data bus & ALU. It depends on your definition of memory. 8085 Memory Interface. 2 Bytes). The 8085 was 8 bits. It can run at a maximum frequency of 3 MHz. Ans. Lower order address bus is multiplexed with data bus to minimize the chip size. Academia.edu is a platform for academics to share research papers. – 11 address lines, A 0-A 10, – one chip select, CS. To store 16-bits data, they are stored in two consecutive memory locations (i.e. Following is the table showing the list of Data-transfer instructions with their meanings. The word size of a computer is generally determined by the size of its accumulator.

So 8085 support maximum of 64KB.
So 8085 support maximum of 64KB. 8086 has more transistors – about 29000. Microprocessor 8085 is a controlling unit of a micro-computer, fabricated on a small chip capable of performing Arithmetic Logical Unit (ALU) operations and communicating with the other devices connected to it. Later incarnations of the Intel x-86 line were 32 bits. Memory Size:-The number of location and number of bits per word will vary from memory to memory.