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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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There is no need to do this. Strings of bytes should 8z0 between double quotes. It reserves num bytes of space and initializes them to 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. Everything after this directive is ignored.

Parts of the code can be omitted using these conditional statements. Incbin stands for “include binary”. The previously defined pages are not overwritten.

Assembler directives

It takes one argument, which must evaluate to a value in the first pass it may not use labels which are defined later. This can be used to put some comments at the end. All definitions should be separated by commas.


It allows the included binary to be “patched”. As in C but without thethis includes an other source file. Multiple expressions, separated by commas, may be specified.

It allows any binary data to be included verbatim into the output. Almost any name is possible without escape characters, because of the quote rules. With these directives it is possible to define new commands, which will output defined code. Assejbleur takes one or two arguments, num and val. Normally, the first directive in a program is org, to set the starting address.

.BYTE/.DB – z80 Heaven

It is a convenience directive for defining least significant byte first two byte words, as the Z80 uses them. If the argument of seek is greater than the current output size, the file is extended with zeros.

This is mostly useful in combination with incbin. 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.

At the start of each page, the code can set the starting address to the mapping address. At the end of the program, it is allowed to use the “end” directive. It will seek in the output file and start overwriting previous output. 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: Code which is not assembled is checked for a correct command. Org only changes the assembler’s idea of “where” it is.

In the following example, the output contains 4 bytes: The first non-whitespace character after the include directive is considered x80 starting quote. This sets the assembler’s idea of the current address. This is what seek is for. People have requested to be able to overwrite the generated output. The argument is given in the same way as for include.

At the start, the current address is set to 0. It allows definition of one or more literal bytes, as well as strings of bytes.

If val is omitted, it defaults to 0. Assembleug filename is then read, until the ending quote, which is the same as the starting quote.