Re: [sdiy] My New Project - PCSYNTH

[Roman]

I can't see why the I/O instruction could be so slow.
Have you tried to watch on the scope I/O CS line in the ISA slot?
I'm assuming the Parallel controller may have some overhead.
OTOH 586 is far more twisted than 8086 - the last one I know from the inside a bit.
As for the sloppy edges - yes, it's because of EMI suppression. They are usually 2nF caps to GND on the port outputs.

Have you considered making ISA card with DAC mapped to memory space instead of I/O space?

Roman

---- Wiadomość Oryginalna ----
Od: Scott Gravenhorst <music.maker at gte.net>
Do: synth-diy at dropmix.xs4all.nl
Data: Sun, 05 Jun 2005 18:12:08 -0700
Temat: Re: [sdiy] My New Project - PCSYNTH

> I'm trying to do this with the lowest end hardware around. 
> Literally junk, in my case, a Am-5x86/133 (which is really an
> enhanced 486).  I'm also trying to do this without buying
> *anything* because of my abject poverty.  I also want to stay
> away from a Windows operating system.  I've been thinking
> about doing this for some years, it is now time to try it. 
> If it doesn't work, well then I'll try something else, but I
> believe I can do this, even with slow I/O.
> 
> "tomg" <e4m at houston.rr.com> wrote:
> >Hi Scott...  What if you could do it in software? 
> >I'm talking about Synthedit. I used to run it on a 
> >500Mhz with a SB Live.
> >
> >In case you think it might sound like crap. 
> 
> I would never assume that.  I just really don't like
> programming in a Windows environment.  I've done it, I don't
> like it.
> 
> Doing this the way I'm doing it makes it all mine.  The only
> tools I will use are an assembler and a soldering iron to
> build the DAC interface.
> 
> And thanks for this, I will keep this information handy as an
> alternative in case this fails.
> 
> >Here's 
> >a couple of tunes by Tim Conrardy performed on his 
> >M42 (Synthedit) Vsti. That's not a SB live  :)
> >http://www.algomusic.nl/products_M42.html
> >
> >http://www.algomusic.nl/mp3/Opuim.mp3
> >
> >http://www.algomusic.nl/mp3/M42%20Journey.mp3
> >
> >VSTi host - editor Free - $20.00
> >http://www.synthedit.com/ 
> >My free SC P-600 emulator. (synthedit)
> >http://www.ele4music.com/vst/p-600.zip
> >
> >You'll need a VSTi  host or use Synthedit.
> >Mini Host - Donation Ware...
> >http://www.tobybear.de/p_minihost.html
> >VSTHost - Donation Ware...
> >http://www.hermannseib.com/english/vsthost.html
> >
> >After SE (synthedit) you can go C++, or 
> >SynthMaker it's a  little of both... but not quite 
> >ready..
> >
> >He didn't build these with SE but I really like 
> >Antti's Augur & ASynth. - Donation Ware..
> >http://users.tkk.fi/~ajhuovil/vst.html
> >http://antti.smartelectronix.com/
> >
> >Didn't one of our guys write Vaz? Sorry I should
> >remember....??
> >
> >Regards
> >Tom
> >
> 
> ---------------------------------------------------------
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> -- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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>