Emulating a SID (or sort of)... with a 65xx.

From: tokafondo <tokafondo_at_gmail.com>
Date: Fri, 28 Aug 2020 20:36:47 -0500 (CDT)
Message-ID: <1598665007671-0.post_at_n4.nabble.com>
Everybody building a SBC that wants sound output gets to the same wall: There
are not sound generators, or programmable sound generators, or such kind of
chips available like they were 30 years ago. Yes, you can get them a pulled
ones, or old stock, or you can go the FPGA, PIC or Arduino route and get one
of those sound cores that end being more powerful than the SBC itself, just
to get SID or FM sound.

There has been discussions about getting funcion generator chips, couple
them to an external amplifier chip, and use them to generate waveforms based
basic sounds.

And I even read recently as having a 6502 CPU in a SBC just to generate
sound.

So... How difficult could be to get a 65xx CPU, have it generate a waveform
with its ADSR settings, process it applying filters or whatever, and
bitbanging it to a DAC, to generate sound?

In another words: how feasible would be to implement a sort of SID (or
whatever other generic PSG chip) engine in a 65xx chip, that could be used
inside the same cpu, or act as an external sound chip for a main CPU? Do
exist such a thing?



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Received on 2020-08-29 04:00:03

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