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If nothing happens, download the GitHub extension for Visual Studio and try again. This repository contains example code for the Z80 processor, written in assembly language. This is where I'll post things as I experiment. This is true of the Z80 emulator I'm using, as well as the physical machine I intend to build. The simplest example is the first, which increments a single byte of RAM endlessly.
If you have an emulator that lets you dump RAM after every instruction, or physical hardware upon which you can do the same this should prove your code is working:. This example is similar to the previous one, but instead outputs the contents of the HL register-pair, as a four-digit hexadecimal number. If you assume this ld hl, 0xFthen you should see the output "0xF" generated, which proves a number a has been converted to an ASCII-string, and output correctly.
There are a couple of builtin commands for dumping ram, inputing data, and calling functions. Here you see that the input-address is optional in the second line, bytes are just appended to the value previously set.
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Sign up. Z80 assembly-language programs. Makefile Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit Fetching latest commit…. Z80 Examples This repository contains example code for the Z80 processor, written in assembly language. The code should be standalone, but I assume that there is the ability to output a single byte to the serial-console, or STDOUT via: ld a, '3' out 1a Similarly I assume reading a single character from a serial-console, or STDIN, is possible via: in a, 1 This is true of the Z80 emulator I'm using, as well as the physical machine I intend to build.
If you have an emulator that lets you dump RAM after every instruction, or physical hardware upon which you can do the same this should prove your code is working: ram-increment.
String Output Outputing a string, held inline. Simple test of loops: string-output. Number Output This example is similar to the previous one, but instead outputs the contents of the HL register-pair, as a four-digit hexadecimal number.
Each command is invoked via a letter. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.Bad Behavior has blocked access attempts in the last 7 days.
The ultimate Amstrad CPC community! Home Help Login Register. Send this topic Print. Mode 1 font 2 bytes wide and 16 lines tall. I will add to this thread as I release my example sources. Fmtrxtpenalver and brainslave like this.
My games. When the Stop button is pressed your code is executed. The multiface 2 menu is not shown. Uses hardware scroll crtc reg 12 and Note: Code is not optimised, it is meant for example for others to learn. Sprites are 3 colours pen 0 is transparent. Background is 4 colours. These are also known as "bitplane" sprites.
Quote from: arnoldemu on19 April Quote from: redbox on21 April Pen 0 of sprite is transparent, leaving 15 pens for use with the sprite. Background can use any of the 16 colours. Sprite is masked when it is drawn to screen. Background behind sprite is stored in a buffer. Sprite x movement is by the byte so 2 pixels at a time in X. Sprite y movement is by the line 1 pixel in Y.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
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If nothing happens, download the GitHub extension for Visual Studio and try again. This is a very accurate Z80 emulator I wrote many years ago. It has been used in several machine emulators by other people and it has been extensivelly tested. It is fast, small 33 KB when compiled as a x dynamic libraryeasy to understand, and the code is profusely commented.
If you are looking for a Zilog Z80 CPU emulator for your project maybe you have found the correct one. I use this core in the ZX Spectrum emulator I started as hobby.
You must first install Za header-only library that provides types and macros. This is the only dependency, the emulator does not use the C standard library or its headers. Then add Z If you preffer to build the emulator as a library, you can use premake4 :. This structure contains the state of the emulated CPU and callback pointers necessary to interconnect the emulator with external logic.
Details z80run sets this variable to 0 before starting to execute instructions and its value persists after returning. The callbacks can use this variable to know during what cycle they are being called.
Description The value used as the first argument when calling a callback. Returns The 8 bits read from memory. Returns A bit value containing the bytes of an instruction. The instruction must begin at the most significant byte big endian.
Description CPU registers and internal bits. Details It contains the state of the registers, as well as the interrupt flip-flops, variables related to interrupts and other necessary flags.
This is what a debugger should use as data source. Description Backup of the 7th bit of the R register.
Details The value of the R register is incremented as instructions are executed, but its most significant bit remains unchanged. If an instruction directly affects the R register, this variable is also updated accordingly.The Z80 is an 8-bit microprocessor introduced by Zilog as the startup company 's first product.
The Z80 was conceived by Federico Faggin in late and developed by him and his 11 employees starting in early The first working samples were delivered in Marchand it was officially introduced on the market in July With the revenue from the Z80, the company built its own chip factories and grew to over a thousand employees over the following two years.
The Zilog Z80 is a software-compatible extension and enhancement of the Intel and, like it, was mainly aimed at embedded systems.
Although used in that role, the Z80 also became one of the most widely used CPUs in desktop computers and home computers from the s to the mids. The design was also copied by several Japanese, East European and Soviet manufacturers. At Fairchild Semiconductorand later at IntelFaggin had been working on fundamental transistor and semiconductor manufacturing technology.
He also developed the basic design methodology used for memories and microprocessors at Intel and led the work on the Intelthe and several other ICs. Masatoshi Shimathe principal logic and transistor level-designer of the and the under Faggin's supervision, joined the Zilog team. According to the designers, the primary targets for the Z80 CPU and its optional support and peripheral ICs [ii] were products like intelligent terminalshigh end printers and advanced cash registers as well as telecom equipment, industrial robots and other kinds of automation equipment.
By MarchZilog had developed the Z80 as well as an accompanying assembler based development system for its customers, and by Julythis was formally launched onto the market. Early Z80s were manufactured by Synertek and Mostekbefore Zilog had its own manufacturing factory ready, in late These companies were chosen because they could do the ion implantation needed to create the depletion-mode MOSFETs that the Z80 design used as load transistors in order to cope with a single 5 Volt power supply.
Masatoshi Shima designed most of the microarchitecture as well as the gate and transistor levels of the Z80 CPU, assisted by a small number of engineers and layout people. According to Faggin, he worked 80 hours a week in order to meet the tight schedule given by the financial investors. The Z80 offered many improvements over the . The Z80 took over from the and its offspring, thein the processor market,  and became one of the most popular 8-bit CPUs.
Some organisations, such as BTremained loyal to the for embedded applications owing to their familiarity with it, and to its on-chip support for a serial interface and multi-level interrupt architecture. Perhaps a key to the initial success of the Z80 was the built-in DRAM refresh, and other features which allowed systems to be built with fewer support chips Z80 embedded systems typically use static RAM and hence do not need this refresh.
For the original NMOS design, the specified upper clock frequency limit increased successively from the introductory 2. The CMOS versions allowed low-power sleep with internal state retained, having no lower frequency limit. The programming model and register set of the Z80 are fairly conventional, ultimately based on the register structure of the Datapoint The Z80 was designed as an extension of thecreated by the same engineers, which in turn was an extension of the The also introduced the important 8-bit immediate data mode for accumulator operations, and immediate bit data for HL, BC and DE loads.
Furthermore, direct bit copying between HL and memory was now possible, using a direct address.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. NET is a Z80 processor simulator that can be used as the core component for developing computer emulators see for example NestorMSXor to exercise pieces of Z80 code in custom test code.
It is written in C targetting the. If you like Z NET you may want to take a look at ZWatcher too. For your convenience, you can add Z NET to your project as a NuGet package if you want.Hello World on the TI-83 - Z80 assembly Lesson H7
In that case you may want to take a look at the release notes. Execution is completely synchronous: one single thread is used for everything, including firing events. As seen in the Hello World example, you just invoke one of the starting methods and wait until it returns there are means to force this to happen, see the execution stop conditions.
If you want some kind of multithreading, you'll have to implement it by yourself, I just tried to keep things simple.
Interaction of the processor with the hosting code and the outside world memory and ports can be achieved by handling the class events, by plugging custom implementations of the dependencies, or both at the same time. Interrupts can be generated by using interrupt sources. NET implements all the documented Z80 behavior, plus all the undocumented instructions and flag effects as per The undocumented Z80 documented except for the following:.
You can try these tests yourself by running the ZexallTest project. My kids need moar shoes! I'm Konamiman, the MSX freak. No more, no less. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up.
A Z80 simulator written in C.Early personal microcomputers, such as the Altairwere programmed using assembly language and machine code. However, there was much interest in developing higher-level computer languages for these early machines. So, when personal computers appeared, there was a natural desire to develop a BASIC language interpreter that could run on these new machines. Microcomputers where handicapped in the early years by the size of memory, which usually cost more than the microprocessors.
Nonetheless, a number of BASIC interpreters were written that could run in small memory spaces of only a few kilobytes. It was one of the early formal expressions of the free software philosophy.
Digital Research Source Code
So, on first look it seems to be well suited for use in the CPUville Z80 computer with the serial interface. The original Tiny BASIC assembly language was written in a dialect for a mainframe assembler has since been lost. However, Roger Rauskolb in October of modified the assembly language so that it could be assembled by Intel's Macroassembler, also known as MAC The source code for this assembler was written in Fortran Most mainframe and minicomputers of the day had Fortran compilers, so this assembler was easy for most hobbyists to access.
First, I had to compile the MAC assembler. Fortunately, the open-source Fortran compiler gfortran has the ability to compile obsolete Fortran dialects such as Fortran 66, and I was able to compile MAC and run it on a PC, in the Linux environment.
And, that was it! Z80 Kits Z80 Kits home Single-board computer kit Bus display kit for single-board computer Original computer kit Bus display kit for original computer Logic probe kit Serial interface kit Disk and memory expansion kit Accessories Instructions News and issues How to order.
Projects Projects home Z80 wire wrap Original processor 8-bit processor. Videos Z80 kit videos 8-bit processor videos.The purpose of this page and its sub pages about members of Z80 family and close relatives is to collect and share information and good ideas.
I know there are lots of people out there, who have developed some good utilities and hardware solutions. Now we all can share this infomation. This page contain docs, FAQs, source code, cross- assemblers, cross- compilers, utilities, etc. Some of the info found here is property of Zilog, like hardware docs, instruction sets, and some of the software available. Read the copyright notice.
Some of the links here are no more online and some are not yet correct: they are marked with a??? Please report all updates, corrections and suggestions to the webmaster Gaby Chaudry.
Be aware of the fact that many products mentioned in this series of Z80 related documents are nowadays out of production : if you want to start a project, don't forget to check where to get the parts from, and what the conditions are Yes I have read the legal info. Breaking News! Sharp has built a Z80 CPU on glass.