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On 4/12/07, korgpolyex800 <korgpolyex800@...> wrote:Hi Kokoon,
I miss my SH-101 for just that reason.
I spent some time thinking about how to do, as you so appropriately
put it, "decent portamento". At one point I was looking at using the
existing master DCO bend circuit to create the portamento but I fear
that might not give us a "decent" portamento and I just know it's
going take a lot of programming time to make it work. Another way to
do portamento would be to build a brand new master DCO that was able
to sweep across the entire 88 note keyboard (did I mention that I'm
going to provide full 88 key range as an selectable parameter?). But
such a master DCO will require even more circuitry so it will
definitely have to go into the full retrofit kit. I may try to use the
bend circuit first and see what sort of results I get, if they are
"decent" then perhaps we can avoid adding more hardware.
Isn't this fun!
Mike.
--- In korgpolyex@yahoogroups.com, "jure zitnik" <kokoon@...> wrote:
>
> all i'm interested in is a decent mono mode with portamento :)
>
> cheers,
> kokoon
>> On 4/12/07, korgpolyex800 <korgpolyex800@...> wrote:
> >
> > Hi all,
> >
> > Well, if there's one thing I've learned it's that you should never use
> > polls to make decisions because you can be sure that poll questions
> > were written and scripted by an idiot.
> >
> > OK, down to business.
> >
> > After looking at the poll results and seeing some of the responses I
> > was prompted to rethink the goals of the project. Taking into
> > consideration all of the work I've done so far and the progress made
> > it would be possible to take all of the new sysex functions (and more)
> > and put them into ROM space if we could add just one additional 8K
> > ROM. The challenge is to add that ROM without requiring major surgery
> > on the hardware. Well it turns out that a small board that would use
> > two 8K ROM's and one XOR logic gate chip could be made that would map
> > the second ROM into the same address space as the existing RAM. The
> > second ROM would be disabled for the low 2K of address space where the
> > 2K RAM exists. This would mean that we would end up with 14K or ROM
> > instead of the existing 8K. The only problem with this concept is that
> > we don't get any additional RAM at all. This would mean that any new
> > sysex commands would have to be wedged into the existing RAM in such
> > as way as to not stomp all over the existing programming. I'll have to
> > do some testing to see what scratch RAM is available in that little 2K
> > RAM chip.
> >
> > Then, there is the big retrofit project. This will give us so much
> > additional RAM, ROM and other hardware that we'll be able to transform
> > the Poly 800 and EX800 into something much more than we could ever
> > have imagined. It requires removing one IC and adding a much larger
> > plug in board. It will include two flash EEPROM's which means we'll be
> > able to download new code as it becomes available. And it will have
> > many new performance parameters and operational capabilities.
> >
> > I think perhaps I should go for the easier retrofit kit first and go
> > from there.
> >
> > Mike.
> >
> >
> >
>