Archorg - Module 3 (Extra)

A partial topic from Module 4, mostly about Memory Segments

Memory Segment

The locations of a ____________ that are active are identified by the value of the address held in the four internal segment registers.

Code Segment

This type of internal segment register contains the program or code.

Data Segment

This type of internal segment register contains data referenced by almost all instructions and many addressing modes. Data are almost always moved into or out of MM via this segment. The Physical address of the data is generated by adding the contents of one of the index or pointer registers ( BX, DI, or SI) to the contents of DS * 10H.

Stack Segment

This is for the LIFO stack. The physical address is a combination of the contents stack pointer ( SP ) plus SS * 10H.

Extra Segment

This is normally for string instructions. When a string instruction is executed, the destination location is addressed by the destination index register ( DI) plus ES * 10H.

Register Addressing

An addressing mode wherein the operand to be accessed is specified as residing in an internal register.

Immediate Addressing

Direct Addressing

Register Indirect Addressing

Base Addressing

Base-Plus-Index Addressing

Base-Relative-Plus-Index Addressing