Strange behavior on power-on (explained)

Es gibt 1 Antwort in diesem Thema, welches 560 mal aufgerufen wurde. Der letzte Beitrag (14. Dezember 2020 um 03:25) ist von adtbm.

  • I want to share a strange issue I had - and the explanation I found.

    Every time I powered on my MEGA65 I got a different start-up screen (Open ROMS) than after a reset (C65).

    After spending some time thinking about this I remembered that the Open ROMS start-up was also shown when I had not inserted an SD card at all.

    Removing my SD-card and re-inserting it fixed the issue - now power-on also starts up as C65 (using the ROM's on the SD-card).

    Maybe a slightly loose SD-card can cause some timing issues that result in the MEGA65 booting as if there is no SD-card present on power-on - and on reset the timing works out better?


    This was the start-up screen on power-on:

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    And this was the start-up screen after reset:

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  • When the MEGA65 boots up with the OpenROM, this means the SDcard is not properly inserted (you've already checked this).

    or the SDcard is corrupted.

    In this case i would suggest, to do a backup of the SDcard to your PC, then utilize the SDcard with the MEGA65 (press ALT while powering on and use the SD utility).

    after that copy the SDs PC backup back to the SD, put it back to the MEGA65 and try again.

    All components on the MEGA65 R3 board are high quality. so from mechanical point of view, there shouldn't be any issues with the SDcard.

    EDIT: PS: it's always usefull to do a backup of the SDcard :wink:

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