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  1. Motorola 68000 vs 68010 PCM quality. Let's finally put the rumours to rest.

    The Sega Genesis / Mega Drive was released almost 30 years ago, in 1988. By that point the 68000 was 9 years old, having been released in 1979.
    Motorola did, however release a minor upgrade to the...
  2. Thanks to all the people that have posted info...

    Thanks to all the people that have posted info since 2016!
    Shoutouts to Eep386, whose info provided some interesting patterns that were previously missing.

    List updated!
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    For audio stuff (at least CD quality) you only...

    For audio stuff (at least CD quality) you only need around 2.5 V/us of slew rate.
    This page can give you some insight into the types of opamps you could use (bipolar or FET)....
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    There's a sort of similar Op-Amp that can drive...

    There's a sort of similar Op-Amp that can drive headphones though not as well as the TDA1308 , the 4560D by Japan Radio Corp. We had found earlier in the design an IC similar to the CXA1034 with...
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    As an EE and associated designer for the original...

    As an EE and associated designer for the original Mega Amp (1.0, on 2.0 I just provided some ideas but not extensive testing), here are my thoughts on the ideas.

    1.- Replacing the TL07x is a good...
  6. You can also tweak the filtering in case you want...

    You can also tweak the filtering in case you want unfiltered audio (though why would anyone want to do it?).
  7. What makes it interesting is that it happens on...

    What makes it interesting is that it happens on the bugfixed Sonic 3 Complete. I assume this can also happen on the original game.
  8. Sonic 3 & Knuckles Mushroom Hill softlock.

    Hi!
    I recently stumbled upon this (glitch?) while testing some recording methods to use with consoles using stuff I already have.
    If you beat the mid-boss in Act 1 too fast,neither the goal post...
  9. Those are thermistors, used as a thermal...

    Those are thermistors, used as a thermal protection in case:
    A) Any of the charging components got too hot (ICs and Battery)
    B) Overcurrent situations.

    EDIT: I would reuse the thermistors as a...
  10. It might work but Li-Po cells have a different...

    It might work but Li-Po cells have a different way to charge than old Ni-Cd. You can find some cheap Lithium cell chargers on sites like eBay or Sparkfun. Then just tap the AC plug to the charger and...
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    I have been making some optimizations to the...

    I have been making some optimizations to the logic gates and removing some unneeded functions (you can't control region through cart slot on the Genesis).
    Although I could even reduce it to a...
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    Success! After a while, I managed to get the...

    Success! After a while, I managed to get the YM2413 working.
    Here's a photo of the temporary setup, where I piggybacked the signals from the cart slot....
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    A quick question. Does the Genesis have very...

    A quick question. Does the Genesis have very limited fanout on its address and control lines?
    Just adding the PLD causes the system to not boot (in Genesis mode). But if I leave the PLD unplugged,...
  14. It's a good idea to make it switchable via...

    It's a good idea to make it switchable via bridges. Makes for a unique board layout.
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    That's what I thought when designing this one. I...

    That's what I thought when designing this one. I was thinking of removing PSG muting controls, as on the cartidge slot you don't have any access to those.

    EDIT:
    So considering these lines, and...
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    It is possible. There are instances of this...

    It is possible. There are instances of this working like the Master System BIOS where PSG is a backup instrument, or Sonic 1 FM, which uses PSG for SFX and FM for music.
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    OK, so that means it's required. Given this...

    OK, so that means it's required. Given this device can't handle bidirectional pins when it's in registered mode, I think I'll have to split it in 2... or see how else I can optimise it.
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    Genesis YM2413 pass-through cartridge.

    Hello there!

    After some time away from the community, I decided to do this little project as a bit of a challenge.

    My idea is to port the SMSFM and instead of making it a PBC like dbelec's...
  19. After a few months' worth of leave, let me put...

    After a few months' worth of leave, let me put some more clips of how the Mega Amp can improve your Genesis listening experience:


    https://www.youtube.com/watch?v=f67mVqdrZSk
    ...
  20. Sticky: Depends on the console you installed in, but...

    Depends on the console you installed in, but basically it comes down to removing the additional capacitors and adding 2 resistors and 2 capacitors as per the schematic.
  21. Sticky: WOW! It's been a long time since I last posted in...

    WOW! It's been a long time since I last posted in here... Let's solve that by adding another Mega Amp clip:


    https://www.youtube.com/watch?v=Js4an2RBAFs

    As always, using a YM2612 Mega Amp.
  22. They definetly can do 50Hz and other odd refresh...

    They definetly can do 50Hz and other odd refresh rates.
    Oddly enough, that's the way I play PAL games. I happen to have a TV that can do S-Video and component in both NTSC and PAL. S-Video tends to...
  23. UTSource is a reliable source for these chips....

    UTSource is a reliable source for these chips. They work and last time I ordered some they looked vintage enough to be legit.
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    YM2203 register writing

    Hi there. I am currently working on making a MIDI synth with the YM2203 soundchip.
    Currently I am planning on testing the SSG part and then add FM synthesis.
    I am using an Atmega328P, with AVR GCC...
  25. Sticky: I can record it. How long does the guy want these...

    I can record it. How long does the guy want these clips? YM2612 or YM3438?
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