Explain six basic SIC assembler directives.

Sure, here are six basic SIC assembler directives:

1. START: This directive is used to indicate the beginning of the program. It also specifies the location in memory where the program is to be loaded.

2. END: This directive is used to indicate the end of the source program. It also specifies the first executable instruction in the program.

3. BYTE: This directive is used to declare a constant in memory. The constant can be a character constant or a hexadecimal constant.

4. WORD: This directive is used to declare a word-length constant or variable. The word length in SIC is 3 bytes.

5. RESB: This directive is used to reserve a specified number of bytes for a data item.

6. RESW: This directive is used to reserve a specified number of words for a data item. Each word is 3 bytes long in SIC.

These directives help the assembler in understanding the structure and organization of the program.