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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Org only changes the assembler’s idea of “where” it is. Normally, the first directive in a program is org, to set the starting address.

Parts of the code can be omitted using these conditional statements. All definitions should be separated by commas.

In the following example, the output contains 4 bytes: The assemblfur is given in the same way as for include. At the start of each page, the code can set the starting address to the mapping address. Using this assembleu 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.


The first non-whitespace character after the include directive is considered the starting quote. People have requested to be able to overwrite the generated output. Multiple expressions, separated by commas, may be specified.

There is no need to do this. The filename is then read, until the ending quote, which is the same as the starting quote.

.BYTE/.DB – z80 Heaven

It allows any binary data to be included verbatim into the output. It allows definition of one or more literal bytes, as well as strings of bytes. Everything after this directive is ignored. At the start, the current address is set to 0.

With these directives it is possible to define new commands, which will output defined code. 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. Almost any name is possible without escape characters, because of the quote rules. It allows the included binary to be “patched”. Code which is not assembled is checked for a correct command.

After this definition, it is possible to use the macro, like this: Incbin stands for “include binary”. This is what seek is for. As in C but without thethis includes an other source file. It takes one or two arguments, num and val. The previously defined pages are not overwritten.

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Assembler directives

If val is omitted, it defaults to 0. Strings of bytes should be between double quotes. If the argument of seek is greater than the current output size, the file is extended with zeros. assembkeur

It reserves num bytes of space and initializes them to val. It takes one argument, which must evaluate to a value in the first pass it may not use labels which are defined later.

Note that no code is generated by this directive, so if padding bytes are required, they must be inserted using defs. At the end of the program, it is allowed to use the “end” directive. This can be used to put some comments at the end. This sets the assembler’s idea of the current address. It is a adsembleur directive for defining least significant byte first two byte words, as the Z80 uses them. It will seek in the output file and start overwriting previous output.