6. The instruction that pushes the contents of the specified register/memory location on to the stack is a) PUSHF b) POPF c) PUSH d) POP Answer: c Explanation: Since PUSH operation transfers data to stack from register or memory location.

8085 Arithmetic Instructions

Arithmetic Group

Condition code register bits. (A) Bit functions and (B) branch instructions. The 8 bits in the accumulator are all zeros, but the carry bit being set to a 1 (high) indicates that the result is actually not 0, but 256. Such a condition can be checked by examining the CC register carry bit for a 1.

It’s is used to store information which is immediately needed by the processor. Processors are very fast & only register memory can match their speeds. Therefore all the information to & from the processor goes via registers. Accumulator is a register which stores the intermediate results for large computations.

An accumulator is a register for short-term, intermediate storage of arithmetic and logic data in a computer’s CPU (central processing unit).

The general purpose registers are used to store temporary data in the time of different operations in microprocessor. 8086 has eight general purpose registers. This is the accumulator. It is 16-bit registers, but it is divided into two 8-bit registers.

Register A is quite often called as an Accumulator. An accumulator is a register for short-term, intermediate storage of arithmetic and logic data in a computer’s CPU (Central Processing Unit). In an arithmetic operation involving two operands, one operand has tobe in this register….Accumulator or Register A in 8085 Microprocessor.

A register is a temporary storage area built into a CPU. Most modern CPU architectures include both types of registers. Internal registers include the instruction register (IR), memory buffer register (MBR), memory data register (MDR), and memory address register (MAR).

Registers are temporary storage areas for instructions or data. Registers work under the direction of the control unit to accept, hold, and transfer instructions or data and perform arithmetic or logical comparisons at high speed.

The two main categories of processor registers are shown below: Memory Address Register (MAR). Memory Buffer Register (MBR).

9 . Which are the four categories of registers:

• General‐ purpose register.
• Pointer or index registers.
• Segment registers.
• Other register.
• All of these.

Registers are the smallest data holding elements that are built into the processor itself. These are the memory locations that are directly accessible by the processor….Difference between Register and Memory :