Directive that changes assembler options. The only options allowed are:
| Option name | Importance |
| Proc6502 | selecting the basic set of 6502 processor commands |
| Proc65c02 | selecting an extended set of 65c02, 6501, and other processors. |
| Proc6501 | Same as Proc65c02. |
| Proc65816 | Select the 65816 processor. |
| CaseSensitive | Differentiating lowercase and uppercase letters in label names |
| CaseInsensitive | treated as equal lowercase and uppercase letters in label names |
| SwapBin | swap binary radix @ and modulo % operators - % now becomes binary radix and @ becomes modulo. |
Syntax:
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Example:
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