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Schmutzpuppe

TIA and digitized sound

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Today I wanted to find out how the TIA plays digitized sounds.

It's nearly the same as the pokey except that there is no need to set the bit5.

The result is attached.

visage.zip

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I have no idea how the Pokey works, but I can tell you that with the TIA, it's just setting AUDC0/1 to the "all-1s" mode, then AUDV0/1 makes 4 bits per channel. After that, it's just a matter of feeding the data at a precise rate, of which 15KHz (the horizontal refresh rate via WSYNC) or 7.5 KHz (half that by using two scan lines) are the most convienent.

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That's what I found out when I took a look at the Jinks code Bruce.

I am impressed that the TIA has this feature I thought that would be more complicated.

The pokey works the same way but in additional you have to set the bit 5 of the AUDV0/1/2/3.

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