[Coco] My introduction - a newbie
jcewy at swbell.net
Sat Jan 27 00:14:57 EST 2007
Torsten Dittel wrote:
> Joel Ewy schrieb:
>> As Torsten mentions, the CoCo's built-in sound is not the computer's
>> strong point. However, even with its limited hardware, there are some
>> games that make pretty good use of it. I've always found the explosion
>> sounds in Polaris to be quite satisfying. And Mega Bug (Pac-Man-like)
>> says "We Gotcha" when you lose. Dungeons of Daggorath makes a heartbeat
>> sound that speeds up as your health declines and slows down as you
>> rest. Recent discussions on this list have re-ignited my interest in
>> the Orchestra 90CC. I may get it out again and plug it in.
> Yep, Polaris hat great sound! I liked that game a lot. IMHO the more
> interesting cartridge is the SSC.
I agree that the SSC is probably the more interesting of the two. But
the Orch-90 hardware is so simple it would be a shame not to include it
as well. It's really just a stereo DAC / audio amp with some ROM
software. Doesn't the SSC have a DAC at some point in the circuit? Or
is it a purely analog device? If it does have a DAC, I think it would
make sense to devise a way to combine it with the Orch-90, if that is at
> I once started thinking about adding
> background music (ATARI ST soundfiles) to CoCo games using the SSC and
> learned about the sound chip and its registers and how to convert the
> files, but some people here figured out that the SSC's "CPU" is
> delivering the register data much too slow to the soundchip (I though it
> would be easy, only 14 register updates max. per 1/50 (1/60) seconds).
> So I never tried it by myself. If I should ever start this project again
> I'll figure out how much CPU-cyles *exactly* it needs to update a
> certain amount of registers. The number of register updates could be
> highly reduced anyway by analyzing, pre-processing and that way
> compressing the sound file.
Are you talking about reprogramming the SSC's onboard microcontroller?
I don't have a very complete understanding of how the SSC works.
When you say the
More information about the Coco