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Thread: Tandy Sound Compatible PCB

  1. #41

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    In my board it's badically just a voltage input so the power output won't affect the board.

  2. #42
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    Someone tested with SN76489AN? the bill of material report SN76489AN... it's right? It's only a matter to use a speaker and not i.e. headphone? or need some resistance increased?

    Quote Originally Posted by Scali View Post
    I've finally found some conclusive information regarding the 89N vs the 89AN:
    http://www.datasheetarchive.com/dl/2...51d/O/SN76489N

    So the A is indeed a different revision in this case, and its output circuitry is modified somewhat, the output can now only drive 10ma, instead of the 100ma for the non-'A'.

  3. #43
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    Quote Originally Posted by Simone2013 View Post
    Someone tested with SN76489AN? the bill of material report SN76489AN... it's right? It's only a matter to use a speaker and not i.e. headphone? or need some resistance increased?
    This particular PCB comes with its own op-amp (LM386N). So it doesn't rely on the SN76489AN to drive the output. The LM386N should be powerful enough to drive headphones or small speakers (it can also be used with the internal PC speaker).

  4. #44

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    Correct, with 1W output it should be loud enough for pretty much all desktop use cases (approx 90dB with some basic HiFi speakers).

  5. #45
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    Quote Originally Posted by pearce_jj View Post
    Correct, with 1W output it should be loud enough for pretty much all desktop use cases (approx 90dB with some basic HiFi speakers).
    Great! and the SN76489AN is pretty cheap! I'm flying to buy the card then!

  6. #46
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    Quote Originally Posted by pearce_jj View Post
    Correct, with 1W output it should be loud enough for pretty much all desktop use cases (approx 90dB with some basic HiFi speakers).
    Heh, that's not what they thought at Creative at the time I guess. They used to put these 4W amps on their Sound Blasters. They had a stupid amount of power
    Last edited by Scali; November 24th, 2016 at 11:46 PM.

  7. #47

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    I wanna thank Great Hierophant and specially James for believing in this project. When i launched the thread in VOGONS forums almost 2 years ago, there had been a some talk but no real effort to push this forward, so i'm very happy that this project is in its last stages.

    Ordered some PCB's and parts today, my Turbo XT will be the main test bed for the card in the C0h setting and i will also test the card in my socket 7 in the 1E0h setting.

    Some games do allow forcing Tandy sound via command line interface, so i'm hoping the card works in my XT with a few selection of games i have in mind.

    There is no doubt that some games need to be patched, and i think the 2C0h option is a very good idea. Maybe a tool can be written to redirect the writes to that port, which will allow a lot of games to work in 386+ systems.

    Can't wait to test it!!

  8. #48

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    Got my PCB's!!! Now just waiting for the damn PSG chips arrive from Hong Kong. Super excited for this, can't believe it's been almost 2 years.

    Thank you James!!

    IMG_20161206_185741985.jpg

  9. #49
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    Quote Originally Posted by CarlosTex View Post
    Got my PCB's!!! Now just waiting for the damn PSG chips arrive from Hong Kong.
    Ooh nice!
    My PCB is still underway, somewhere... Got a bunch of PSG chips coming in from Hong Kong as well, eta was somewhere between 6 and 18 Dec, so can be any day now

  10. #50

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    Well, don't get too excited yet... Brian has been working on the board for some time and it's currently preventing his system from booting

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