03. Writing a program

There are few, strict rules:

• There are two sections, the .data and .prgm ones. Data section must come before the program section.
• Labels are formatted as &label and followed by a = sign if the data is on the same line (this can be done only in .data section!).
• Every instruction is formatted as follows: instr: arg1, arg2, arg3. Every instruction is made of 3 letters, followed by an s if you want to update the flags (allowed only in operations that involve the ALU, ignored otherwise), followed by an optional conditional (two letters). There must be only one instruction per row.
• You can recall a certain label (for using it in a put, set, jmp or cal command) using the syntax $label.
• Comments can be written with a trailing #, but they cannot be placed at the end of a line (i.e. a line containing a comment must not contain also an instruction before the comment).
• BE CAREFUL! When using the put command, the loaded address MUST be declared inside the .data section.

For further details check the example programs in the programs folder.