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TZXDuino Firmware 1.16, 1.17, and an updated TZXDuino Instruction Manual

 TZXDuino 1.16

In TZXDuino 1.15.3 I added a bug that lowered the volume of some Spectrum TZX files and all ZX80/81 TZX, O, and P files so they didn't work for many people.
I fixed this for 1.16.

You can download TZXDuino 1.16 from here.


TZXDuino 1.17

The MAXDuino team added ORIC TAP playback functionality to their firmware which I have adapted to TZXDuino. I don't have an Oric Atmos to test it on so I have been recording the playback and loading on Oricutron and everything I have tried has worked. Obviously things may be different on a real machine.
Team MAXDuino have also added a speed up function for Oric TAP files which I will add to TZXDuino 1.18 but so far I have been unable to get it to work correctly.

You can download TZXDuino 1.17 from here.


And finally there is the updated instruction manual which now tells you how to access Turbo mode for the Electron, ZX80, and ZX81. It also says for Oric but that has not been implemented yet.

You can download the pdf of v1.2 fo rthe TZXDuino Instruction Manual from here.


  1. hi! i updatet to this from 1.15.3 and yes it is loading more game now successfully, but i would like to ask... is it possible to me here at home adjust volume even higher in the arduino code?

    i tryed tape tester on toastrack 128 and it goes only up to the second level. It can be that on another unit it would work better but i only have this one. Thank you if you hace time to answer.

  2. To the best of my knowledge you cannot increase the output through code. It is a known issue that Toastracks are more difficult to load on via TZXDuinos.

    Sorry I couldn't be of any more help.

  3. Stupid question: which PCD8544 library do I need for these?

    1. Not a stupid question at all I think I linked to it a long time ago but I haven't for a while.
      Here is the Mega link to the library

    2. This comment has been removed by the author.

  4. Thanks for this. Just uploaded to my board. Just need to dig the Spectrum+ out to test.

    Looking at the code, can I check the define OLED1306_0.91 doesn't seem to be used anywhere? My TZXduino has a 0.91" 128x32 display and the display is scrunched up ... the display looks like it's defined as 128x64 rather than the correct 128x32 as it's only using the top of the screen. It's not a major issue but I can't see how to try to correct this.

  5. On TZXduino v1.16 I het the message ""Global variables use 1541 bytes (75%) of dynamic memory, leaving 507 bytes for local variables. Maximum is 2048 bytes. Low memory available, stability problems may occur."

    I figure that isn't a serious problem, but is it normal?

  6. Hi Duncan,

    Quick one for you... in your routine TickToUs, you are using floating point math.

    You could replace the calculation with integer math ((ticks*4)+7)/14, which would yeild the same result as your float calculation, but saves a few hundred bytes of program space.

    I guess it's possible for a (word) to overflow, but unlikely with the numbers used in the ZX Spectrum.

    You could always cast it to a (long) if that was a problem.

  7. Is there a known issue with using sdfat 2.0.x. My Aduino IDE updated the sdfat library and the compile is now throwing a pile of errors:

    TZXDuino_V1.16:361:68: error: no matching function for call to 'SdFat32::chdir(char*, bool)'

    TZXDuino_V1.16:503:28: error: 'class SdFile' has no member named 'cwd'

    /Arduino/libraries/SdFat/src/FatLib/FatVolume.h:251:8: note: no known conversion for argument 1 from 'bool' to 'const String&'

    Going back to sdfat 1.1.4 fixes the issue.


    1. This comment has been removed by a blog administrator.

    2. Okay. Seems my version of the IDE is not keeping me informed of updates to libraries.

      Yes. 2.0.x has definitely opened a can of worms.
      This will affect all firmwares, Arduitape, CASDuino, TZXDuino and also those who use MAXDuino.

      Keep on 1.1.4 and I'll have a look as to what has changed in the library.

  8. Hello, tell me where to get an electric
    scheme of this device TZXduino?

    1. Do you mean PCB schematics or general instructions that you can use for veroboard?

  9. This comment has been removed by the author.

  10. Hi i already compiled the project but i can only acess menu ,wich gives me access to tsx baud rate,but i can´t select sd file do i need to have the lm386 amp conected for this to work ??

    kind regards

    1. It sounds like you have an issue with your SD card reader or SD card if it's only allowing you to access the menu. Either that or you are pressing the menu button to select the file rather than the play button.

    2. I found now that i have to change arduino nano pins on the code but when i do this there is a bug.when card is not inserted the no sd card dont appear and goes to the message select file..

    3. What pins are you using for the SD Card?
      What happens with the SD card inserted?

    4. When sd card inested work ok I found that there is a loop on the code when nothing pressed it loops the code is on the play pause function there is a delay of 200 if we put more delay the message appear but I wanted to stop after the no sd card function appear and not a loop message ..

    5. When sd card insert works ok


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