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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Assembler directives

This is mostly useful in combination with incbin. The filename is then read, until the ending quote, which is the same as the starting quote. People have requested to be able to overwrite the generated output. At the assembleuf of the program, it is allowed to use the “end” directive.

Org only changes the assembler’s idea of “where” it is. Multiple expressions, separated by commas, may be specified. It allows any binary data to be included verbatim into the output. It allows the included binary to be “patched”. It takes one or two arguments, num and val.

assemblwur 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. After this definition, it is possible to use the macro, like this: It will seek in the output awsembleur and start overwriting previous output. The previously defined pages are not overwritten. Parts of the code can be omitted using these conditional statements. 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.


This is what seek is for.

It is a convenience directive for defining least significant byte first two byte words, as the Z80 uses them. This can be used to put some comments at the end.

The argument is given in the same way as for include. It takes one argument, which must evaluate to a value in the first pass it may not use labels which are defined later. Code which is not assembled is checked for a correct command. With these directives it is possible to define new commands, which will output defined code.

It reserves num bytes of space and initializes them to val. If the argument of seek is greater than the current output size, the file is extended with zeros. It allows definition of one or more literal bytes, as well as strings of bytes.

.BYTE/.DB – z80 Heaven

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. As in C but without thethis includes an other source file. Everything after this directive is ignored. Assejbleur stands for “include binary”.


Strings of bytes should be between double quotes. This sets the assembler’s idea of the current address.

generale assembleur z80 &copy _public_domain_ ()

All definitions should be separated by commas. In the following example, the output contains 4 bytes: At the start, the current address is set to 0. There is no need to do this. Normally, the first directive in a program is org, to set the starting address.

If val is omitted, it defaults to 0. At the start of each page, the code can assembleuur the starting address to the mapping address. The first non-whitespace character after the include directive is considered the starting quote.