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    This is indeed the Arm7 procedure working on the...

    This is indeed the Arm7 procedure working on the T3.6 but not working on the T4.
    No progress so far.
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    For the teensy 5.0 for sure 2 full SPI busses...

    For the teensy 5.0 for sure 2 full SPI busses next to the on board uSD. One of the SPI could be pre-wired to smd pads where a psram could be optionally soldered.

    I would reconsider the flash...
  3. Not tried on the T3.5 (I don't have one) but it...

    Not tried on the T3.5 (I don't have one) but it now works on more platforms including the cheap and great Teensy4.0 allowing AtariST emulation

    https://github.com/Jean-MarcHarvengt/MCUME/
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    Great! Mjs513 posted some info in the Teensy4...

    Great! Mjs513 posted some info in the Teensy4 software restart thread. It seems that every attempt to restart the T4 results in a shutdown? Not clear what the reason is and if there is already a...
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    Same behaviour as with wdog sample of tonton81 I...

    Same behaviour as with wdog sample of tonton81 I had posted the question yesterday in the teensy beta thread, Tonton81 did react and will have a look later. Thanks to all.
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    Some correction, I see the callback message but...

    Some correction, I see the callback message but no reset occurs (monitor output greyed out)

    also you have to adapt the code for the macro WDOG_WCR_WT as below I guess else it does not compile...
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    Happy that you reacted and sorry for the...

    Happy that you reacted and sorry for the confusion.

    Again, my gall is to generate a reset of the T4 by software (reboot the same flashed image)
    I indeed tried your example on the Teensy4.0. I use...
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    Anyone know how to trigger a reset of the Teensy4...

    Anyone know how to trigger a reset of the Teensy4 in software?
    I tried WDOG but not clear where the WDOG would be locked during startup code (I don't see in the code)

    I also tried the arm v7...
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    SCB_AIRCR = 0x5FA0004; while (true) { ...

    SCB_AIRCR = 0x5FA0004;
    while (true) {
    ;
    }
    Also not working on the T4
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    I asso don't see why I would unlock the WDOG. I...

    I asso don't see why I would unlock the WDOG.
    I don't see it locked in startup code?
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    Also tried below procedure but no luck (see 1060...

    Also tried below procedure but no luck (see 1060 manual)

    *(volatile uint32_t *)0x400BC004 = 0xD928C520;
    while((*(volatile uint32_t *)0x400BC000 & (1UL<<11) )==0);
    *(volatile uint32_t...
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    I saw it also yesterday by accident. That does...

    I saw it also yesterday by accident.
    That does not work for me. The project is blocking the T4.
    I think it was developed for the T4beta1 using the 1052
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    Soft reboot on Teensy4.0

    Is there a way to trigger a reboot of the teensy 4.0 from the code? E.g. using watchdog? Anyone implemented it already?
  14. Play old Arcade Classics on the Teensy4.0

    I just published the video today:

    https://youtu.be/q_BFhx5OfPc
    https://youtu.be/MSNT9EDy8uM

    Visit the project here:
    https://github.com/Jean-MarcHarvengt/teensyMAME

    Sound yet to come...
  15. Source code published...

    Source code published
    https://github.com/Jean-MarcHarvengt/teensyMAME
    https://youtu.be/q_BFhx5OfPc
    https://youtu.be/MSNT9EDy8uM
  16. Hi, You can find the example that blocks the...

    Hi,

    You can find the example that blocks the Teensy4.0 at startup (needs a button press) in my MAME port git project.

    https://github.com/Jean-MarcHarvengt/teensyMAME

    load teensyMAMEClassic2...
  17. hi Mike, About the SPI display you should use...

    hi Mike,
    About the SPI display you should use DMA mode on the T4 (and T3.6)
    There are various versions on the T4 forum but the one you can find in the MCUME project is derived from the one of Frank...
  18. I can provide you a sample but indeed, you could...

    I can provide you a sample but indeed, you could only warn the user as the stack usage for the remaining memory will be application dependent.
  19. That makes sense. Paul once indicated that the...

    That makes sense. Paul once indicated that the second 512KB was almost available for malloc at the exception of a library/driver using a bit of DMAMEM.
    My experience is that as soon an application...
  20. no, don't dream ;-) Only early 80ths classics...

    no, don't dream ;-)
    Only early 80ths classics are working (dig dug, moon patrol, pacman...). Even Xevious is problematic.
    The main issue is that Mame expands all GFXs to min 8bits per pixel in RAM...
  21. Hi Mike, So you are actually the person that did...

    Hi Mike,
    So you are actually the person that did the initial Atmega port but also the T3.6 with spi RAM. I indeed started from that version. I have a greetings section at the bottom of the page, I...
  22. https://github.com/Jean-MarcHarvengt...ster/README...

    https://github.com/Jean-MarcHarvengt...ster/README.md

    Here you can find few emulators that I ported to the teensy4. 8086 was one of them. You can try changing the HDD image for this particular...
  23. MAME (Multiple Arcade Machine Emulator) ported to Teensy4.0

    Initial port available soon.
    Only very basic classics as pacman, galaxian, galaga... (more fancy classics will require some serious redesign dur to lack of memory)
    No sound yet
    Picture will be...
  24. [queued] Atari 520ST emulator on Teensy4.0

    MCUME multi-systems emulator has been upgraded to support Teensy4.0 and ST7789 Display.
    Now with Atari 520ST support (Motorola 68k core running full speed!)...
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    As promised, MCUME multi systems emulator updated...

    As promised, MCUME multi systems emulator updated to Teensy4.0 and ST7789.
    Now with Atari 520ST support (Motorola 68k core running full speed!)...
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    MQS sound is now ok. With pin10 mono (not using...

    MQS sound is now ok. With pin10 mono (not using pin 12). I am still interested to know how to disable fully MQS on pin 12 in case I would use MISO one day.
    I now soldered the SD using SDIO iso SPI....
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    Thanks for the tip. Mono sound is is enough. If I...

    Thanks for the tip. Mono sound is is enough. If I could use pin 10 only for audio (CS can be whatever pin) and disable MQS on pin 11.
    As soon the SPI init is called, MQS sound stops. I guess I need...
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    Thank you Manitou! I never noticed it was on the...

    Thank you Manitou! I never noticed it was on the card. It works also for me with the guitar sample. I thought it was on pin 2 (out2). You know if it can be reconfigured somewhere else. 10 and 12 are...
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    Hi Frank, Is the MQS output still supported in...

    Hi Frank,

    Is the MQS output still supported in the Audio library for the T4?
    On what pin does it output sound? I tried pin2 with 100uF (+ at pin 2 side), speaker in series to ground but I hear...
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    Sorry, just saw this link now:...

    Sorry, just saw this link now:
    https://www.pjrc.com/breakout-board-for-teensy-4-0/
    Thanks Paul.
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    Hi Kurt, Not sure if you tried yourself to...

    Hi Kurt,
    Not sure if you tried yourself to connect the 4pin SDIO at the bottom (8pins) to a micro SD.
    Could somebody help me to find the type of connector required for the SDIO pins, the one use...
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    Hi Paul, is the PWM audio output working in...

    Hi Paul,

    is the PWM audio output working in the Audio lib on the T4? I have a compilation error with the T4 but not with the T3.6?
    I am not familiar with using PWM as for audio output. Is there a...
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    Congratulations for the great job! Many people...

    Congratulations for the great job!
    Many people were waiting for this milestone.
    And I am really amazed by its price.
    Very competitive and unique for many points.

    I wish the T4 a very successful...
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    @manitou,@wmxz, Is there a way to specify the CS...

    @manitou,@wmxz,
    Is there a way to specify the CS when using uSDFS in SPI mode (audio board or when using the SD of the ili9341 display) iso the Sdio build-in pins? A bit like SD lib does?
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    If someone wants to try the emulators on the T4,...

    If someone wants to try the emulators on the T4, use teensyMCUME on https://github.com/Jean-MarcHarvengt
    Pinout file is included. For more details, use the doc in espMCUME. At the exception of...
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    Thanks, I had noticed that you could also use...

    Thanks, I had noticed that you could also use uSDFS with the SD card but when I tried it was not working. May be it is because of my card. I use to format it Fat on the Mac. I will try again when I...
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    I have tried USDFS with USB MSC library, it goes...

    I have tried USDFS with USB MSC library, it goes very well. I created a small app on the ILi9341 to browse files from USB and SD card (using Sdio connected of the break out board). For the SD file...
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    Talking back about the cache management, I also...

    Talking back about the cache management, I also had the issue using the SD card library to load content into OCRAM. I just wrap up the file.read in a custom function that reads in everything in...
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    Thanks for your advice Paul, it did help. I now...

    Thanks for your advice Paul, it did help.
    I now have a picture for the Atari520ST emulator port. I still miss 8K to allocate outside the OCRAM but I can now see how fast the T4 is compare to the...
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    I just received my T4b2 from Robin on Tuesday....

    I just received my T4b2 from Robin on Tuesday.
    Amazing form factor!
    Will the ribbon be provided in the final product too?

    The card was just on time to understand properly the pinout. So, no I...
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    Hi Paul, I don't think it is a bad idea. I...

    Hi Paul,

    I don't think it is a bad idea.
    I guess cached/uncached memory is independent of DTCM/OCRAM
    That would mean that data and DMA buffers can end up in static variables (at least 128K for...
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    I am using MacOS 10.13.6 with Arduino IDE 1.8.5....

    I am using MacOS 10.13.6 with Arduino IDE 1.8.5.
    I did not try if the behavior was different with another OS as the T3.6 is still recognized correctly. Only the T4 is giving issues.
    Thanks!
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    BTW, I have again the same issue with the T4. No...

    BTW, I have again the same issue with the T4.
    No serial port detected at usb plug in.
    Button pressed for 15 secs, red LED for few secs (intensive light)

    But after, no sign of live.
    short press...
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    Hi Kurt, My experience with the ILI9341 and...

    Hi Kurt,

    My experience with the ILI9341 and the T4 (and T3.6 BTW) is that it is nice to switch between DMA and non DMA mode within your application.
    As the ILI9341 has both SD card reader and...
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    It got resurrect. Thanks a lot!

    It got resurrect.
    Thanks a lot!
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    Hi Frank, hi Paul, I now ported all emulators...

    Hi Frank, hi Paul,

    I now ported all emulators from the T3.6 to the T4, with the I2C keyboard support.

    https://github.com/Jean-MarcHarvengt/teensyMCUME
    Code can be compiled for both targets.
    ...
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    Hi Paul, hi everyone! I have been silent for...

    Hi Paul, hi everyone!

    I have been silent for some time since I received my T4 beta board. I apologize for this...

    In a first time I did observe from far away the great job achieved by the team...
  48. Cool Thank you Robin! Still busy to port the...

    Cool Thank you Robin!
    Still busy to port the building blocks to a new MCU, guess which one...;-)
  49. I moved the NES emulator to the NoFrendo emulator...

    I moved the NES emulator to the NoFrendo emulator core.
    It is running full speed with sound!
    At least it is possible to run 48k games on the TFT now. Unfortunately I miss some memory for the VGA...
  50. Thanks Robin, that's cool to be on the main...

    Thanks Robin, that's cool to be on the main page...!
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