Intel 8259 is designed as a 28-pin-programmable IC available as a package named DIP (Dual inline package). Its physical and functional pin diagrams are indicated below.PIN NameDescription and PurposesVcc and GndIt is the Power supply and ground pins. +5V power supply isused in this chip.D7-0For communication with the processor, there ... Read More

In 8085 Instruction set, there are two instructions to control the Cy flag bit content. Thesemnemonics are STC and CMC. Both are 1-Byteinstructions. There hex codes are given in the following table – Mnemonics, OperandOpcode(in HEX)BytesSTC371CMC3F1Using STC instruction we can set the Cy flag bit to 1 irrespective of itsprevious value. ... Read More

In 8085 Instruction set, we are having one mnemonic JNC a16, which stands for “Jump if Not Carry” and “a16”stands for any 16-bit address. This instruction is used to jump to the address a16 as provided in the instruction. But as it is a conditional jump so it will happen ... Read More

In 8085 Instruction set, we are having one mnemonic JNZ a16, which stands for “Jump if Not Zero” and “a16” stands for any 16-bit address. This instruction is used to jump to the address a16 as provided in the instruction. But as it is a conditional jump so it will ... Read More

In 8085 Instruction set, we are having one mnemonic JP a16, which stands for “Jump if Positive” and “a16” stands for any 16-bit address. This instruction is used to jump to the address a16 as provided in the instruction. But as it is a conditional jump so it will happen ... Read More

In 8085 Instruction set, CNC is a mnemonic, which stands for “Call if Not Carry”. This instruction is used to branch to the subroutine whose 16-bit address is provided in the instruction, only if Cy flag value is 0. If Cy flag value is 1, program flow continues in the ... Read More

In 8085 Instruction set, CPO is a mnemonic, which stands for “Call if Parity Odd”. This instruction is a used to branch to the subroutine whose 16-bit address is provided in the instructions, only if P flag value is 0. If Z flag value is 1, program flow continues in ... Read More

In 8085 Instruction set, RNC is a mnemonic, which stands for “Return if Not Carry”. This instruction is used to return to the main program, only if Cy flag value is 0. If Cy flag value is 1, program flow continues in the subroutine sequentially. It is a 1-Byte instruction.Mnemonics, ... Read More

In 8085 Instruction set, RPO is a mnemonic, which stands for “Return if Parity Odd”. This instruction is used to return to the main program, only if Z flag value is 0. If Z flag value is 1, program flow continues in the subroutine sequentially. It is a 1-Byte instruction.Mnemonics, ... Read More

In this program, we will see how to check the 4th bit of an 8-bit number.Problem StatementWrite 8085 Assembly language program to check whether the fourth bit of a byte is 0 or 1.When it is 0, store 00H at any specified location, and when it is 1, store FFH at ... Read More