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Thread: A4000TX ATX Amiga motherboard

  1. #341
    Kavven's Avatar
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    Removed u455 & u456, reset line is ok again and after adding u212 and u213 i get 512 kB of chipram..
    All 2 mb is soldered though..? :/

  2. #342
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    Default PS/2 Keyboard Update

    Would it be possible to get the source files for the PS/2 keyboard avr?


    I would like to update the code to bind the PC key scancode 61 aka |\ to rawkey 30 so we can use a custom keymap to faithfully map the GB PC keyboard layout.


    Thanks in anticipation.


    UPDATE

    I've got this working.
    Last edited by ChewChew; 26th July 2021 at 19:32.

  3. #343

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    Whoa! This is awesome. It will be even more awesome when the Apollo V4 comes out!

  4. #344
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    Two questions:

    - ER975 to ER978, are these 120 Ohm ferrite bead networks or 150 Ohm? In the BOM, they're listed as 150 Ohm, but the Mouser cart has the correct quantity of 120 Ohm (probably not a huge difference, but might as well get it right)

    - I lifted a pad when I flipped the board over and knocked off C404 (argh!). Is C404 the same as C404 on the original A4000? I need to connect the negative pad back up.

    Thank you!

  5. #345
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    Sorted

    After a bit of research and looking the U206_ATMEGA88.hex file it was quite easy to spot the array mapping the scancodes to raw key codes. Changing the value at offset 7EA from FF to 30 in the .hex file did the trick.

    Quote Originally Posted by ChewChew View Post
    Would it be possible to get the source files for the PS/2 keyboard avr?


    I would like to update the code to bind the PC key scancode 61 aka |/ to rawkey 30 so we can use a custom keymap to faithfully map the GB PC keyboard layout.


    Thanks in anticipation.
    Last edited by ChewChew; 26th July 2021 at 19:37.

  6. #346
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    Quote Originally Posted by s800 View Post
    Two questions:
    ...
    - I lifted a pad when I flipped the board over and knocked off C404 (argh!). Is C404 the same as C404 on the original A4000? I need to connect the negative pad back up.
    ...
    Answering my own question here, this is a filter cap between the audio section and the rest of the motherboard, so power can be picked up anywhere.

  7. #347
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    Well, looks like I might have somewhere ZorroIII to put my incoming ZZ9000 after all! This is a fantastic piece of work Hese.

  8. #348

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    Fantastic! I definitely want one. Thanke you, Hese!
    Call me Golan; my parents did.

  9. #349
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    I've been up and running on a self-assembled A4000TX for a week or so now. The biggest debugging challenge was a intermittent contact between a pin on a DRAM for chip ram. It looked okay, but eventually I went around and tested each pad -> "leg" and found the bad connection.

    I'll write this off as a problem with using NOS chips. They weren't from China, but had some oxidation that probably contributed to this problem (hypothesis).

    I do still have a problem with the onboard fast ram. So working on that issue.

    Also, beside thanks to Hese, Chuck's DiagRom is absolutely genius.

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