I created the assembler for the Z80 a few days later to compile the changes code from the disassembler into an EPROM image and build a new firmware for my aquarium computer.
The .Z80 files, as used by the various Spectrum emulators, are compressed and need to be de-compressed before disassembling. The assembler also knows the most commend pseudo opcodes (look into the sourcefile 'Z80 Tokenize.c'): We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. Use Git or checkout with SVN using the web URL. The size of the ROM and entry points have to be coded directly in the sourcecode. Online Assembler and Disassembler. The subroutine ''OpcodeLen()'' returns the size of one opcode in bytes. calculated branches with ''JP (IY)'', ''JP (IX)'' or ''JP (HL)''. Online assembler / debugger for old *bit microprocessors (8080, 8085, Z80, 6502, 6800, 6809) ZX Spectrum SBC6809 SBCZ80 SBC6502 KIM-1 CP/M JPR-1 PMD85 PMI-80 Workspace in your browser
If nothing happens, download Xcode and try again. ''ELSE'' Include the following code, when the expression on IF was false.
On a Macintosh the low-level debugger is called, when such a jump is found. It comes in two flavours, a DOS command line version and a
The parser can't recognize them, either.
''ORG'' Set the PC in the 64k address space.
It is a commandline tool. ii. to generate code for address $2000. If nothing happens, download the GitHub extension for Visual Studio and try again.
I didn't had a table for them while writing the disassembler and they were not needed anyway. By default, dZ80 will not skip any bytes, so you must use the -h=[bytes to skip] command line option to instruct dZ80 to skip the correct amount.
View the dZ80 FAQ's.
machine ROMs, Z80-based personal computer snapshots (e.g. There are some exceptions, the parser can't recognize: self modifying code. i.
A ROM shouldn't contain such code.
- Inkutils - InkSwitch - InkFinger, This page was last modified on the 10th of February, 2002. ''DEFB'' Put a byte at the current address, ''DEFW'' But a word at the current address (little endian!). I may add automatic .Z80 de-compression in a future version of dZ80. It is called while parsing and while disassembling. they're used to log you in. Home - Freebies - Spectrum - dZ80
I created this small disassembler for a Z80 cpu in one afternoon. Referring again to the .SNA format, this starts at address 16384, going up to 65535.
ODA is an online disassembler for a wide range of machine architectures, including: Alpha, ARM, AVR, Intel x86, Motorola 68000, MIPS, PDP-11, PowerPC, SPARC, Z80, and more! ARM ARM (thumb) AArch64 Mips (32) Mips (64) PowerPC (32) PowerPC (64) Sparc x86 (16) x86 (32) x86 (64) . E.g. The assembler stops here.
No pointers! Where in the Z80's address space to start the disassembly. dZ80 is a freeware Z80/Z180/Z80GB disassembler for binary files, such as arcade
released on the 9th of March, 2002. Use the -e=[end disassembly] command line option to change this. Learn more. ''PRINT'' Print the following text on the console. This enables Disqus, Inc. to process some of your data. It is a commandline tool. Longs are not necessary for a Z80, because the standard Z80 only supports 64k. This program is freeware. To change this, use the -m=[memory base] command line option. For more information, see our Privacy Statement. What's new in the latest version? Unused code. If nothing happens, download GitHub Desktop and try again. Defines space for global variables that have no given value. Every ANSI C compiler should compile this program. View the dZ80 FAQ's, The Windows version has these additional features. It is not allowed to be used as a base for a commercial product! When disassembling a file, dZ80 needs to know four things: ''IF'' Start the conditional expression. The disassembler tries to analyze what part of the binary data is program code and what part is data. Binary Disassembler Code Disassembler Disassembly Output Disassembler Disassemble Z80 Z180.
Make sure that the code is not called via a jump table! In the meantime, there are various utilities to convert .Z80 files to raw formats, such as .SNA, which dZ80 will disassemble correctly. This enables Disqus, Inc. … Windows GUI version. (not), ''^'' (xor), ''<<'' (shift left) and ''>>'' (shift right). This is useful for findings bugs in the disassembler and creating a list of variables. It is coded directly from a list of Z80 opcodes, so the handling of ''IX'' and ''IY'' could be optimized quite a lot. These are quite often in a ROM. If you found a jumptable - like on my Futura aquarium computer - insert some more calls of ''ParseOpcodes()''. Download the latest version
It start with all hardware vectors of the Z80 (''RST'' opcodes, NMI) and parses all jumps via a recursive analyze via ''ParseOpcode()''. they're used to gather information about the pages you visit and how many clicks you need to accomplish a task. to 27 and 16384 respectively for source files with an extension of ".SNA". Whereabouts in the file the data starts. Even today it is often used as a cheap embedded CPU. ''ENDIF'' End of the condition expression. Upload a Windows PE file, ELF, or raw binary and then view the disassembly and object file … GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. …
Learn more, We use analytics cookies to understand how you use our websites so we can make them better, e.g.
Sinclair ZX Spectrum, Amstrad
The assembler allows mathematical expressions in operands: ''+'', ''-'', ''*'', ''/'', ''%'' (modulo), ''&'' (and), ''|'' (or), ''!'' Hinton's page here
Brackets are also available. Provided by: z80dasm_1.1.3-1_amd64 NAME z80dasm - Z80 assembly generating disassembler SYNOPSIS z80dasm [ options] file DESCRIPTION z80dasm disassembles a binary file containing Z80 machine code into Z80 assembly language source (including a number of undocumented opcodes). Whereabouts in the Z80's memory space the file starts.
built-in front end. Disassembler for binary files, such as arcade machine ROMs, Z80-based personal computer snapshots The dZ80 application was designed to be a freeware Zilog Z80 Processor Code Disassembler. The Z80 syntax is documented in the Zilog documentation. We use essential cookies to perform essential website functions, e.g. The disassembler recognizes no hidden opcodes (the assembler does!). By default dZ80 will disassemble from the address specified by -m (or the default of 0).
This subroutine is quite long. iii. It also supports the Z180 instructions which fill up some holes
It knows all official Z80 opcodes and some undocumented opcodes (mainly with ''IX'' and ''IY''). If you're looking for a 16-bit version of dZ80 for DOS, download dZ80 v1.31 here
You can always update your selection by clicking Cookie Preferences at the bottom of the page. iv. The Z80 CPU was widely used in the 80s in many home computer. Code that is never called by anybody, could not be found. Every opcode is marked in an array (''OpcodesFlags''). It will take a raw binary file and disassemble it. By default, dZ80 assumes that the start of the file corresponds to address 0. Z80 disassembler Disassemble Z80 Hex dump Disassembler Disassemble Z80 Dump. Disassemble On Demand. The current version of dZ80 is v2.0, which was
CPC, MSX, Colecovision, etc.) The dZ80 application was designed to be a freeware Zilog Z80 Processor Code Disassembler.
Learn more. The disassembler recognizes no hidden opcodes (the assembler does!). This obviously must be skipped.
Disassembly of the code. Seperated with a "," or a string. This small assembler has some nice gadgets: it is a quite fast tokenizing single-pass assembler with backpatching. Work fast with our official CLI. Number can be postpended by a ''D'', ''H'' or ''B'' for decimal, hexadecimal and binary numbers.
Longs are not necessary for a Z80, because the standard Z80 only supports 64k. Only solution: disassemble the program and look into the code. download the GitHub extension for Visual Studio. dZ80 will automatically set the above items i. and ii. Learn more. Use the -s=[start disassembly] command line option to change this. A lightweight, online service for when you don’t have the time, resources, or requirements to use a heavier-weight alternative. Set the Symbol ''DEBUGGER'' to 0 to disable this behavior... Jumptables. Both have the same capabilities, but the Windows version has a
about dZ80. If a routine wanted an "address" to the Z80 code, it is in fact an offset to the array of code.
We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. Click on the dZ80 logo of the required version to download.
What's new in the latest version? If you need more information can get one of the following books: I created this small disassembler for a Z80 cpu at one afternoon. By default, dZ80 will disassemble to the end of the loaded source file. Where in the Z80's address space to end the disassembly. It disassembles one opcode at a specific address in ROM into a buffer. ''END'' End of the sourcecode. If false, the following sourcecode will be skipped (until ''ELSE'' or ''ENDIF''). Explore executables by dissecting its sections, strings, symbols, raw hex and machine level instructions. It only uses come ANSI functions (look into ''main()'') for loading a file called "EPROM". ''DEFM'' But several bytes in the memory, starting at the current address. ''DEFS'' Set the current address n bytes ahead. Load comments. DOWNLOAD Z80 Dissassembler 1.0.0.0 for Windows.
Online wrappers around the Keystone and Capstone projects.. It can try to guess locations of labels in the code or the labels can be specified by hand in the form of a … If you want to change the filename of the sourcefile, you have to change main(). No pointers! in the EDxx opcode range. In ''main()'' is a switch for disassembly with address and hexdump instead of disassembly with labels. for Windows 9x/ME/NT/2000/XP (554K), If you're interested in a Macintosh port of dZ80, visit Grame
Optional. Thanks to everyone who's e-mailed me with suggestions and comments
The expression parser is located in [[Z80 Calc.c]]. I didn't had a table for them while writing the disassembler and they were not needed anyway. Analyze the code. You signed in with another tab or window. More file extensions may be supported in future versions. If a routine wanted an "address" to the Z80 code, it is in fact an offset to the array of code. Some files, such as .SNA files (Sinclair ZX Spectrum snapshots) have a 27 byte header before the start of the data. It correctly disassembles all known undocumented, but often used, instructions, including those using the IXl/IYl and IXh/IYh registers, as well as the strange looking "LD r, RLC (IX+4)" type instructions. dZ80 2.0 dZ80
Great for testing the assembler. With the help of the OpcodesFlags table the disassembler now creates the output. It is tested with Think C 5.0 on a Macintosh.
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