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• On board USB UART not working?

  Jacques Pelletier • 12/05/2025 at 19:03 • 0 comments

  I had problems with the USB UART (CH340G). It frequently disconnected under Linux.
  
  I just looked into this these past weeks. It turned out that the USB connector became flaky and that was the cause for the frequent disconnects. I also suspected the chip wasn't supported, but a loopback test worked fine with minicom (while the connection lasted). So linux supports the CH340G.

• binary editor improvements

  Jacques Pelletier • 06/21/2025 at 09:27 • 0 comments

  The binary editor was a bit awkward to use. I simplified this and added the terminal's arrow keys to move around.

  How to use: 

  like shown in the photos, the STM32F407GT6 board is plugged into a STM to Z80 adapter board.

  This board makes the connection to the serial port of the STM board and a connector is available to connect an FTDI basic or similar USB to serial converter. Open a terminal at 115200 bauds N81, and set ANSI terminal.

  There was a compilation error that was simple to correct. In Core/Src, there's a file sysmem.c. Edit it and add this include:

  #include <sys/types.h>

• Minor fix

  Jacques Pelletier • 12/13/2022 at 06:23 • 0 comments

  A minor fix to display the status of the debugger: Step, Run or Halted.
  

• Basic functionalities completed!

  Jacques Pelletier • 12/12/2022 at 02:38 • 0 comments

  I completed the debugger: it can step, run until 'RET', run until PC = address, run continuously. You can also edit the registers between steps.

  Importing symbols will be implemented later.
  

• Source files available on Github

  Jacques Pelletier • 12/07/2022 at 16:21 • 0 comments

  https://github.com/jpelletier/Z80_ICE

• Suggestions and features wanted

  Jacques Pelletier • 12/07/2022 at 15:12 • 0 comments

  I'm currently writing the debugger part of the Z80 ICE. I would like to have suggestions and features that users would want.

  -step

  -step until return

  -breakpoint (step until PC = breakpoint address)

  More complex features to implement:

  support for NMI and interrupts, (being able to step in these)

  import symbol files from SDCC and Z88SDK
  

• LibZ80 is working!

  Jacques Pelletier • 12/05/2022 at 01:37 • 0 comments

  I just integrated the libZ80 and it now executes Z80 code!
  

  I will make a easy to use debugger which can step, show disassembly, registers and stack.

  To do: import symbol files
  

• Some improvements already

  Jacques Pelletier • 12/04/2022 at 13:17 • 0 comments

  Adjusted the bus cycles timing to be equivalent to those measured on a real Z80 at 4 MHz.
  

  Done some improvements to the binary editor, it's a bit easier to use and there's now a help on screen.

  The Intel Hex loader now works if we send bytes slowly enough. On linux, I use the command: "pv -L 10 myhexfile.hex > /dev/ttyUSB0", which transmit 10 bytes/sec.

  I will try to implement interrupt or DMA on the serial port.
  
  
  

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