[sdiy] Old Computers

[Heitor Alves]

On that website:

"Know bugs and nasty feature in hardware 

Because JDAC and CENT_DAC use the same data lines as printer, it is
not possible to print file and output sound at the same time. When
printing files irrating sound is heard from JDAC or CENT_DAC audio
output."

This sound terribly interesting :o)

any one tryed out this kind of random music making? send some drawings
to print with a device like this attatched to the LPT1?

Regards,
Heitor

On 5/29/05, Niels A. Moseley <n.a.moseley at alumnus.utwente.nl> wrote:
> Hi,
> 
> >So I looked at Jarek's site and I see he uses a homemade 16 bit DAC, driven
> >by 2 CMOS latches.  I wondered why we can't do the same with a printer
> >port.  That totally removes the need for a soundcard altogether and the
> >"dongle" would be extremely simple and trivial to program.  PCs have a
> >built in programmable interrupt timer that can be set to interrupt
> >regularly and an interrupt service routine could then calculate the next
> >DAC value and present it.
> >
> >Has anyone approached this at all?
> 
> http://www.tkk.fi/Misc/Electronics/circuits/dacs.html
> 
> The interrupt routine has a lot of overhead. The 'covox speech thing' used
> this method and it was a cheap substitute for a Soundblaster around 1990.
> 
> Regards,
> Niels.
> 
> 
>