(1) You can read cs directly like any other segment register. RE: DS,CS,SS,ES? lionelhill (TechnicalUser) 28 Nov 03 05:54 So, the couple of CS:IP is a pointer pointing to the current instruction of running program. It is always coupled with CS and it is NOT modifiable.

IP denotes the current pointer of the running program. It's because doing the wrong thing with this register could cause your program in ruin. Although SP can be modified easily, you must be cautious. Usually BP is used for preserving space to use local variables. BP is base pointer, SP is stack pointer, and IP is instruction pointer. The register BP, SP, and IP are called pointer registers. These register is commonly coupled with DS and ES. This is usually used to move a block of data, such as records (or structures) and arrays. As the name follows, SI is always pointed to the source array and DI is always pointed to the destination. SI is called source index and DI is destination index. These registers are usually used to process arrays or strings. The register SI and DI are called index registers. The couple DS:SI and ES:DI are commonly used to do string operations. It is usually used with DI and doing pointers things. You can point this to anywhere you want as long as it contains the desired data. It points to the segment of the data used by the running program.

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