[rescue] Sun SpeakerBox Docs
dgy at DakotaCom.Net
Sun Jun 18 11:56:35 CDT 2006
Janet Campbell wrote:
>> I'd like to repurpose some speakerboxes. I'm curious
>> if anyone has any *detailed* information on the guts
> How detailed is detailed?
I was hoping for a schematic that would let me figure out where
to cut into the circuit... :-(
> It's got an onboard CS4215, with a 2-bit parallel synchronous CHI
> interface over four wires (clock, frame sync, data in and out) and a dinky
> amplifier and speaker. It gets thrown between master and slave mode
> depending on if it's handling audio data or control data. If you're
> planning to interface to the CS4215, CS pub number DS76PP5 has the
> information you need.
Yes, that's pretty obvious from a casual inspection of the components
inside (though I haven't tried to remove the "button board" as I
suspect that is *all* it is -- and I don't want to risk busting
anything plastic up there).
> If you just want to gut it and use it as a dumb amplified speaker...it's a
> hassle. Volume and output selection (speaker vs headphones vs mute) is
> all set through the CHI bus (with interaction from the host) and while you
> might find a way to hardwire the amplifier to a specific volume and output
> device, you couldn't really use any of the controls.
I want to *almost* use it as intended but without having to stick
to Sun's I/F -- though I may not have any choice, there (due to
their choice of components). But, I want/need to know how
many of the "controls"/indicators are independant vs. hardwired,
etc. (e.g., the power indicator, etc.)
> Does this help?
Thanks. I'll sacrifice one and trace foils to hack together
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