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Re: Apple II Music Video - Welcome to the Jungle!!
Frank M. wrote:
Michael J. Mahon wrote:
That would be great, but it would require another Apple II, since
DAC522 also uses 100% of the machine. ;-) Then there's that nasty
problem of not having 3MB RAM for the whole song, and not being
able to stop even for an instant to do I/O...
Hellloooooo...! NadaNet!! haha. now that would be something. one IIe
for video and another for sound (running as master). you wouldn't even
need to spend that much time telling the slave video machine to advance
a frame. you could simply do a state-change poll on a single wire
connected between the joystick ports. you could even pre-load frames on
the video machine so you could swap a frame instantly. maybe that's
crazy talk.
No, that is exactly the way to do it--and it should work great!
BTW, how do you convert a sound file down to work with DAC522? is there
some kind of conversion program? and what is the overhead in terms of
bandwidth? i'd love to digitize some audio, too.
DAC522 plays files that are 8-bit "unsigned" samples, at a 11kHz rate.
This is the usual format for 8-bit sound samples. Bandwidth should be
limited to about 5kHz (Nyquist, after all), but that allows pretty good
rendition (somewhere between telephone and AM radio).
Of course, DAC522 only uses the most significant 5 bits of each sample,
so there is some quantization noise, but it's usually quite tolerable
for loud sounds.
-michael
NadaNet networking for Apple II computers!
Home page: http://members.aol.com/MJMahon/
"The wastebasket is our most important design
tool--and it's seriously underused."