It is a convenience directive for defining least significant byte first two byte words, as the Z80 uses them. Multiple expressions, separated by commas, may be. ZASM is a compiler/assembler and monitor (including disassembler and debugger) for the Z80 CPU. It runs under Linux (probably also. Uses. The easiest way to put data directly into your program. Note that since the z80 processor is little-endian, loading into a bit register from.

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At the start of each page, the code can set the starting address to the mapping address.

There assdmbleur no need to do this. Incbin stands for “include binary”. It reserves num bytes of space and initializes them to val. This is mostly useful in combination with incbin.

This is what seek is for.

If the argument of seek is greater than the current output size, the file is extended with zeros. The argument is given in the same way as for include. The first non-whitespace character after the include directive is considered the starting quote. In the following example, the output contains 4 bytes: It allows definition of one or more literal bytes, as well as strings of bytes. The previously defined pages are not overwritten.


Strings of bytes should be between double quotes. Code which is not assembled is checked for a correct command.

It allows the included assmbleur to be “patched”. At the end of the program, it is allowed to use the “end” directive.

The filename is then read, until the ending quote, which is the same as the starting quote. As in C but without thethis includes an other source file. With these directives it is possible to define new commands, which will output defined code.

Assembler directives

Normally, the first directive in a program is org, to set the starting address. It is a convenience directive for defining least significant byte first two byte words, as the Z80 uses them. After this definition, it is possible to use the macro, like this: Using this directive more than once can be useful to create code which is to be executed at the same address, for example when the memory is mapped. If val is omitted, it defaults to 0.

All definitions should be separated by commas.


Otherwise it is not touched, which means that if you use these directives, a successfull assembler execution does not imply that all the code is correct. People have requested to be able to overwrite the generated output. It will seek in the output file and start assemhleur previous output. Org only changes the assembler’s idea of “where” it is. Multiple expressions, separated by commas, may be specified.

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Z80 Assembler Syntax

Everything after this directive is ignored. Note that no code is generated by this directive, so if padding bytes are required, they must be inserted using defs. It takes one or two arguments, num and val.

Parts of the code can be omitted using these conditional statements. Almost any name is possible without escape characters, because of the quote rules. This sets the assembler’s idea of the current address. This can be used to put some comments at the axsembleur. At the start, the current address is set to 0.

It allows any binary data to be included verbatim into the output. It takes one argument, which must evaluate to a value in the first pass it may not use assmebleur which are defined later.