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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This sets the assembler’s idea of the current address. The first non-whitespace character z880 the include directive is considered the starting quote. Almost any name is possible without escape characters, because of the quote rules.

Note that no code is generated by this directive, so if padding bytes are required, they must be inserted using defs. After this definition, it is possible to use the macro, like this: Normally, the assembelur directive in a program is org, to set the starting address.

The argument is given in the same way as for include. Code which is not assembled is checked for a correct command.

It allows any binary data to be included verbatim into the output. People have requested to be able to overwrite the generated output.



This can be used to put some comments at the end. It takes one or two arguments, num and val. 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. With these directives it is possible to define new commands, which will output defined code. Everything after this directive is ignored. 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.

The official ZASM homepage

This is mostly useful in combination with incbin. It reserves num bytes of space and initializes them z0 val. This is what seek is for. At the end of the program, it is allowed to use the “end” directive. Strings of bytes should be between double quotes. As in C but without thethis includes an other source file. It is a convenience directive for defining least significant byte first two byte words, as the Z80 uses them.

Assembler directives

At the start of each page, the code can set the starting address to the mapping address. If val is omitted, it defaults to 0. The filename is then read, until the ending quote, which is the same as the starting quote. Org only changes the assembler’s idea of “where” it is.


The previously defined pages are not overwritten. All definitions should be separated by commas. Incbin stands for “include binary”. Assemvleur expressions, separated by commas, may be specified.

In the following example, the output contains 4 bytes: If the argument of seek is greater than the current output size, the file is extended with zeros.

Parts of the code can be omitted using these conditional statements. There is no need to do this. It takes one argument, which must evaluate to a value in the first pass it may not use labels which are defined later. It allows definition of one or more literal bytes, assebmleur well as strings of bytes. It will seek in the output file and start overwriting previous output. At the start, the current address is set to 0. It allows the included binary to be “patched”.