Addressing Modes
Z – 80 Addressing
Implied - the data value/data address is implicitly associated with the instruction.
Register - references the data in a register or in a register pair.
Register indirect - instruction specifies a register containing an address, where data is located.
Immediate - 8-bit data is provided in the instruction.
Immediate extended - 16-bit data is provided in the instruction.
Modified page zero - the destination address in zero page is calculated as N * 8, where N is a three-bit number supplied by the instruction.
Relative - one byte offset is added to the address of the next instruction. The offset is a signed number in the range -127 - +128.
Extended - the instruction operand specifies the memory address where data is located and where the program control should be transferred.
Indexed - 8-bit offset is added to the contents of an index register (IX or IY), the resulting value is a pointer to location where data resides.
VII. Basic Programming Techniques
Arithmetic programs
BCD Arithmetic Multiplication
Subroutines
Logic Operation etc.
