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  1. The pinkish colors issue has been resolved! It...

    The pinkish colors issue has been resolved!
    It was only occurring with the emulators because the key library was configuring some pins used for the RGB output as input again after the VGA library...
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    VGA out for Teensy 4.0/4.1

    Trying to bring something like uVGA library to the Teensy4.
    Now all MCUME emulators support VGA output!!!

    https://www.youtube.com/watch?v=UE9MPr-iVOg
    ...
  3. Finally the video to share the results......

    Finally the video to share the results...
    https://www.youtube.com/watch?v=UE9MPr-iVOg
  4. I had a look at the example but I opted for...

    I had a look at the example but I opted for another solution.
    I modified the second color nibble DMA copy to allow non 32bits aligned source address and allow shifting the line by few pixels. It...
  5. I will try to port one of the MCUME emulator to...

    I will try to port one of the MCUME emulator to the driver this week and share a video ;-)
    I have to make a setup with a T4.1 or at least a T4.0 with the SD card to be able to run something. I also...
  6. VGA library for Teensy 4.0 and 4.1(finally!)

    I am happy to share this new project!

    https://github.com/Jean-MarcHarvengt/VGA_t4

    Probably not yet at the level of uVGA but it was at least a good opportunity for me to learn about QTIMER and...
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    so for people who wants to try, most important...

    so for people who wants to try, most important using the teensyuae41 project:
    1) have the PSRAM soldered under the T4.1
    2) select the type of display in platform_config.h (ILI or ST)
    3) look at...
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    Sorry, no need to change this for teensy4.1. I...

    Sorry, no need to change this for teensy4.1. I used to connect the psram my own way on the T4.0 but no need if you use teensyuae4.1...
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    I added 2 new videos to demo it......

    I added 2 new videos to demo it...
    https://youtu.be/Ho8qZSCKdLg
    https://youtu.be/vuMYwylYqYs
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    Some updates of the UAE port to the teensy4.1......

    Some updates of the UAE port to the teensy4.1...
    I restarted from a more compatible version of the source code.

    - Sound has been fixed
    - Most GFX problems too (no AGA support yet but ok)
    - Add...
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    Hi bloodline, Just discovered this mail thread...

    Hi bloodline,

    Just discovered this mail thread today.
    Nice project to restart an amiga emulator from scratch.

    I was also my dream to run an Amiga on the T4.0
    I had troubles to port UAE for...
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    Amiga emulation on Teensy 4.1

    Happy to share the initial code and the video of the UAE Amiga emulator running on the Teensy 4.1 + PSRAM.
    2MB chip ram and 4 MB fast ram now mapped on the PSRAM.
    Impressive performance of the...
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    Fantastic!!! Commodore amiga emulation working...

    Fantastic!!!
    Commodore amiga emulation working full speed now on the T4.1.
    No need to split the 512k memory in 2 parts to fit it with all pointers boundary issue...
    And I can even go for 1MB...
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    Michael, Thanks again! The ground pin was indeed...

    Michael,
    Thanks again! The ground pin was indeed the problem. Not the 3.3 v. The one on the corner is ok. not the one next to 3.3 v at opposite side.
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    Hi Michael and mjs513 I also have the same...

    Hi Michael and mjs513

    I also have the same white wire but no 3.3v there for me.
    Or the wire is not soldered properly or the side connected to the pin is the issue.
    Or may be ground is the issue...
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    Hi, I finally received the pre-sample last...

    Hi,
    I finally received the pre-sample last Thursday. This w-e I soldered the psram and the test went ok. Then I decided to solder the header pin and test my Amiga emulator port now running on the...
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    Hi Paul, Great job again! I think a lot of...

    Hi Paul,

    Great job again!
    I think a lot of people were waiting for a T3.6 form factor again.
    I am very impatient to experiment with the QSPI memory chip on that device...
    Any clue of the device...
  18. MSX2 emulation and mini-computer station with casing for the T4

    I updated the MCUME project with MSX1/2 emulation.
    I finally created a standalone version on the multi computer station, working on battery with keyboard.
    Tell me what you think about it!
    All...
  19. Great job!

    Great job!
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    That would be great and a valid reason for me to...

    That would be great and a valid reason for me to move to a larger pinout. I experimented with self made flex PCB to access bottom tracks of the T4. I was surprised how easy it was but at the end I...
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    I still did no perform the experiment suggested....

    I still did no perform the experiment suggested. Shame on me.

    Currently I use the PSRAM mainly as extra memory from where I mostly read.
    I write one time to it and then I only read from it (for...
  22. @Frank, thanks a lot for the library. You...

    @Frank, thanks a lot for the library.
    You implemented the T4.0 software reset function that many people were looking for.
    Great work!
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    it is indeed a not as fast as the specs indicates...

    it is indeed a not as fast as the specs indicates but it starts failing at higher clock frequency.
    Probably best to use Quad SPI mode as alternative. I don't know how to use it on the teensy. May be...
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    I meant 16 bytes + the 5 bytes overhead (1 com +...

    I meant 16 bytes + the 5 bytes overhead (1 com + 3 add + 1 wait) but still below 4us total (2.4us at 70MHz if I am correct)
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    Thanks a lot for the spec hidden detail but by...

    Thanks a lot for the spec hidden detail but by luck the current page size in the driver is 16 bytes.
    So it reads max 16bytes in an SPI transaction (always from a 16 Bytes page boundary, at 0, 16,...
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    Code is within every emulator but I created a...

    Code is within every emulator but I created a separate project at:
    https://github.com/Jean-MarcHarvengt/psramips6404
  27. More emulators ported to the derived project ...

    More emulators ported to the derived project
    Recently added PC engine, Gameboy, Sega Master System, Megadrive and AtariST using external a PSRAM module.....
  28. There are many on PC. I used Speccy the most...

    There are many on PC. I used Speccy the most known. Also nice FPGA projects.

    In meanwhile, I could ported more emulators to the Teensy 4.0 using a PSRAM module.

    Recently added PC engine,...
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    More emulators using the PSRAM module on the...

    More emulators using the PSRAM module on the Teensy 4.0.
    Next to PC engine now Gameboy, Sega Master System, Megadrive and AtariST are using it.
    I had to struggle a week with the SW before figuring...
  30. It will be a challenge as USB stack takes about...

    It will be a challenge as USB stack takes about 50KBytes. Will have to gain 50k ram for the emulator but nice project for Christmas holidays...

    In the meanwhile more emulators ported to Teensy4....
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    Here are few pictures of the T4+PSRAM piggy back...

    Here are few pictures of the T4+PSRAM piggy back and the PCB breaking board I created for the emulation project
    18157
    18158
    With both the ILI9341 + the SD card (from the ILI) on SPI0, I cannot go...
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    Hi, I tried on another setup where only the...

    Hi,

    I tried on another setup where only the ILI9341 (2.2") was connected on SPI0.
    I can reach 100MHz clock in DMA and I also did not notice any issue without DMA.
    This w-e I will create a PCB...
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    As I also have the SD card on the same bus as the...

    As I also have the SD card on the same bus as the display, the load is probably slightly different.
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    Thanks for the tip. My understanding from the...

    Thanks for the tip.
    My understanding from the post is that the ILI9341 was running at about 40MHz with the old limit.

    With the change I can set it up to 60MHz for the display and same for the...
  35. Should be doable. With a bit more memory, USB...

    Should be doable. With a bit more memory, USB midi could be used. I will put it on my TODO list. Resolution might be the biggest problem.
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    if I run the tool of Kurt I get: FlexRAM...

    if I run the tool of Kurt I get:

    FlexRAM section ITCM+DTCM = 512 KB
    Config : aaaaaaff
    ITCM : 110976 B (84.67% of 128 KB)
    DTCM : 377536 B (96.01% of 384 KB)
    Available for Stack:...
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    PC Engine emulation on Teensy4

    Now added PC Engine support in MCUME
    https://youtu.be/Ot9RgDMqdF4
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    I am not an expert of SMD soldering but I managed...

    I am not an expert of SMD soldering but I managed to solder it without any problem. I use flux. It helps a lot for me as I don't have specific equipment for SMD. No issue with MSL also.

    The PC...
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    PC Engine emulator, PSRAM experiment

    I would like to share my first experience using PSRAM (SPI RAM) on the Teensy 4.0.

    Few weeks ago I decided to port one more emulator core to my MCUME project....
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    I bought them at Electrodragon....

    I bought them at Electrodragon.
    https://www.electrodragon.com/product/2pcs-ipus-ips6404-iot-ram/
    The SMD package 3.3v version.
    I am from Belgium. It took 2-3 weeks.
    I ordered 8 and I got...
  41. What exactly happens if you compile for smallest...

    What exactly happens if you compile for smallest code size? Is all code remaining in Flash? So is it like every function was labeled PROGMEM? It typically free up RAM for me.
  42. Hi Paul, Talking about FlexSPI, anyone already...

    Hi Paul,
    Talking about FlexSPI, anyone already tried to mmap another SPI device as PSRAM, in another region. For the SPI flash, is every block/page read cached in the FASTRUN too?
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    MMAP an external SPI device on the T4.0

    I am currently experimenting with PSRAM on the Teensy 4.0.

    I finally got an IPS6404 (8MB RAM) working on the SPI2 bus of the Teensy4.0.
    Speed can still be improved but I am not using DMA transfer...
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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...
  46. 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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