A lot of cool modules and sensors…

 Circuits, Microcontrollers, Microprocessors, My projects, Other  Comments Off on A lot of cool modules and sensors…
May 212017

I am buying electronic stuff from AliExpress – due to the ******* custom policy of EU it is a much cheaper than buying from Adafruit, Sparkfun etc. Unfortunatelly. There is a lot of total crap, but also a lot of great stuff too. I am diving into AliExpress three times a week, and I found many pieces “I really have to build”. So I decided to share these tips with you and made a new web called Alitronik.

There are three tips per day at Alitronik, and each sunday is “a Funday” – a day for tips with something in common. For example – the last one is dedicated to solar power, energy metering, weather stations and lasers. Previous week was in the sign of Raspberry Pi cases, tools, robots and construction of 8085-based mini PC.

From the recent post I want to mention e.g. 37 sensors kit, CC-A80 Cubieboard PC, Speech Recognition Module, LoRa Shield for Arduino, NodeMCU-32S or SMD Tweezer and multimeter tool.

So – bookmark Alitronik.com, read Alitronik RSS, follow @alitronik_tips, subscribe weekly digest or submit your own tips.

Assembler for 8080, Z80, 6502 and much more…

 6502, Microprocessors, My projects, Programming, Z80  Comments Off on Assembler for 8080, Z80, 6502 and much more…
Nov 272016

Readers certainly know my ASM80 – online assembler / IDE for eight-bit processors. I made several derived versions, like single page compiler, embedded version of the translator (I used it in tutorial Stroják.cz), or a stand-alone IDE. The good old command line assembler is here now too.

The prerequisite you have to meet is a functional Node.js environment. It is not complicated, it exists for all major platforms, and you can download it here: nodejs.org. During installation, package manager called NPM is installed too.

NPM is used for install the packages and libraries. To install ASM80 itself just run a command prompt and type:

-g causes the asm80 will not be installed as a library, but as a system tool. Then toy can invoke it as a standard command line utility:

launches translation for file test.a80 and the result will be two files: test.hex with output and test.lst with the translation protocol. Extension .a80 tells the compiler to use the processor’s instruction set for Intel 8080 CPU.

Behaviour can be influenced by parameters. You can set the output file name, you can suppress the generation .lst, or explicitly determine the processor type and format of the output file (besides HEX and S record it can output .COM files for CP/M, .PRG for C64 emulators, or SNA and TAP for ZX Spectrum).

Options are:

  • -o, --output <file> Output file name
  • -t, --type <type> Output type [default: hex]. Available types are: hex, srec, com (for CP/M), sna, tap (for ZX Spectrum), prg (for C64)
  • -n, --nolist Suppress listing (.lst file)
  • -m, --machine <type> Processor type, one of the following: Z80, I8080, C6502, C65816, CDP1802, M6800, M6809
  • -h, --help See HELP

Machine type can be omitted. Right CPU is determined by file name extension (-m option overrides this decision).

  • Intel 8080: .A80
  • Zilog Z80: .Z80
  • Motorola 6800: .A68
  • Motorola 6809: .A09
  • MOS 6502: .A65
  • WDT 65816: .816
  • CDP 1802: .A18

These parameters are described on page NPM package ASM80.

Overview of the syntax and directives can be found on GitHub Pages.

I still have a few suggestions for improvements, I would like to know your opinion …

  • Create a library system, as it has the classic assemblers, which separates translation and linking. So users will have the opportunity to make a library of subroutines, which would include only those parts of the code that are necessary for proper function. You can easily make something like the “standard C library” for your system …
  • Having the opportunity to directly link public code, for example on GitHub.
  • … More processors? Systems?

Thanks for the tips and suggestions. You can send them straight to the GitHub Issues.

Dec 282015

Hello from ASM80. Recently (a ten minutes ago, to be honest) I have added a support for WDC’s 65C816, the 6502 sequel with hybrid data width (8/16 bits). It is used in some notable computers, such as Apple ][gs, Nintendo’s SNES or SuperCPU extension for C64.

Due to its dual data width, I have to added some new directives to specify index / accumulator width. You have to specify it directly with:

Directive Meaning
.m8 Accumulator is 8bit
.m16 16bit accumulator
.x8 index register is 8bit
.x16 16bit index

65C816 added new addresing modes. The main innovation are “long” modes with 24bit addresses, e.g. JMP $123456. Such instructions are compiled in 4 bytes, e.g.  “5C 56 34 12”.

I believe (the word “believe” is important) it should work without any problems, but I warmly appreciate any feedback.

The 65C816 assembler is early beta, so I decided to release it as a single page assembler as this moment instead of full support in IDE. You can try it here: ASM65816 single page assembler. Please do not hesitate to send any feedback or bugreports to my mail asm80@maly.cz Thanks.

Nov 152014

A long time ago I started to play with 8bit CPUs and old computers… again.

There is a lot of development tools for these computers, a tons of assemblers and utilities for any OS, from CP/M to Mac OS, DOS, Linux and Windows including. So there is no space for a new one. But internet is a magic “big space for everything”. 🙂

When I bought Phil’s V6Z80P, I used PASMO assembler. It is a great state-of-the-art assembler, really perfect. But over time I had a lot of assemblers, compilers and IDEs for different CPUs somewhere on my disk. And one day my disk crashed. So I wished to have “an online PASMO”.

At first I made online editor with server-side PASMO. You wrote a code in your browser, pressed COMPILE, code went to the server, PASMO did its magic and send back my HEX (or BIN or whatever). Great thing! Later I’ve added FLASH-based Spectrum emulator, so I could write programs for ZXS, compile it and try it directly in emulator. But I never published this tool.

One year ago I’ve decided to reinvent my wheel again, and this time without server back support. I choose text editor in JavaScript and start development of my very own assembler engine. My goal was to create a modular assembler for different 8bit CPUs, from 8080 to 6809, with simillar syntax. I’ve integrated it with the editor into one “IDE”. Later I added CPU emulating engines, so you could debug your compiled code. Then I added whole computer emulations…

And all of this is free, online, partially open source.

The main part is ASM80.com. This is a web-based IDE with following features:

  • Code editor
  • Simulated workspace for your files (it’s stored technically in your browser, so you haven’t to got any “server account”)
  • Compiling engines for 8080/8085, Z80, 6502, 6800 and 6809 CPU
  • Embedded emulators for all these CPUs
  • Emulators for some computers:
  • Nearly the same syntax and directives for all CPUs
  • Macros
  • Preprocessor

Here is an assembler description and here is source code for the engine.

During my work on ASM80 I developed some minor things in JavaScript. All of these are open source too: 6850js (6850 emulator), 6809 emulator or enhanced 8080js emulator, which can pass through the Examiner test (so every bit works, every T cycle is valid…)

Then I’ve derived small one-page assemblers for all supported CPUs. You can save it in your Favorites or at your local disk and use for simple compiling.

And the newest part of ASM80 family is an IDE80. It’s technically ASM80, with IDE, assembler, debugger and emulatore, repacked and compiled as a desktop application. It’s in beta version, just for Windows at this time, but Linux and Mac OS X versions should came very soon. You can watch a video showing first steps with this IDE.

At this time I’m working on further improvements:

  • Structures in assembler
  • C64 or Atari emulator in JavaScript
  • KIM-1 emulator
  • modules for generating not just HEX or S19, but TAP, SNA, PRG and other popular formats for 8bit computers.

Update 11/16/2014: Beta version of KIM-1 emulator is ready and deployed…