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The Intel 8085 ("eighty-eighty-five") is an 8-bit microprocessor produced by Intel and introduced in March 1976. [2] It is the last 8-bit microprocessor developed by Intel. It is software-binary compatible with the more-famous Intel 8080 with only two minor instructions added to support its added interrupt and serial input/output features.
The Intel BCD opcodes are a set of six x86 instructions that operate with binary-coded decimal numbers. The radix used for the representation of numbers in the x86 processors is 2. This is called a binary numeral system. However, the x86 processors do have limited support for the decimal numeral system.
New opcodes that introduced new functionality (e.g. SHLD, SETcc) For instruction forms where the operand size can be inferred from the instruction's arguments (e.g. ADD EAX,EBX can be inferred to have a 32-bit OperandSize due to its use of EAX as an argument), new instruction mnemonics are not needed and not provided.
Intel 8080, Intel 8085, Z80: NOP: 1 0x00 DEC Alpha: NOP: 4 0x47FF041F Opcode for BIS r31,r31,r31, an instruction that bitwise-ORs the always-0 register with itself. AMD 29k: NOP: 4 0x70400101 Opcode for aseq 0x40,gr1,gr1, an instruction that asserts that the stack register is equal to itself. [3] ARM A32: NOP: 4 0x00000000 This stands for andeq ...
An opcode table (also called an opcode matrix) is a visual representation of all opcodes in an instruction set. It is arranged such that each axis of the table represents an upper or lower nibble, which combined form the full byte of the opcode. Additional opcode tables can exist for additional instructions created using an opcode prefix.
The SDK-85 MCS-85 System Design Kit was a single board microcomputer system kit using the Intel 8085 processor, clocked at 3 MHz with a 1.3 μs instruction cycle time. It contained all components required to complete construction of the kit, including LED display, keyboard, resistors, caps, crystal, and miscellaneous hardware.
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Immediate mode (opcode 0x14) specifies the accumulator, DEC A. 2y: ADD A, operand Add the operand to the accumulator, A. Opcode 0x23 (RL A, "rotate left" but actually a shift left) may be thought of as ADD A, A. 3y: ADDC A, operand Add the operand, plus the C bit, to the accumulator. Opcode 0x33 (RLC A, rotate left through carry) may be thought ...