Discussion about the Korg PolySix synthesizer

On Wed, 12/16/15, tlule@gmx.de [PolySix] <PolySix@yahoogroups.com> wrote:

Subject: [PolySix] Re: Polysix Full Clone [1 Attachment]
To: PolySix@yahoogroups.com
Date: Wednesday, December 16, 2015, 5:05 PM


 









[Attachment(s) from tlule@gmx.de
[PolySix] included below]


Hi Guys,
Thanks for your feedback.
As for the KLM-367, I've already
seen an offer of 40Euros for a good quality PCB on
eBay.That's indeed the right offer for me, so I
do not have to bother about manufacture.
For the other boards, I was actually
hoping for a sort of an open source community.
If we all share our design files, we can
expand our experience faster,more people together
make projects grow faster and better.
As for the special chips, I was thinking
of analogue equivalent circuits. I've already got
an equivalent circuit together for the SSM2056 that fits on
22.5mm x 26.8mm.It is using an LM13700 and a few
more SMDs. Attached is a 3D view of that PCB. That
can be either plugged into the DIL socket, or I directly
replace the SSM in the PCB design by those easy to get
ICs.For replacing the SSM2044, I just only started to
putting a first basic schematic together. But maybe someone
else has got already a solution?
As for the key assigner, yes it would be
great to get some code to start from.Is it coded in
C? Then it could be also mapped to other controllers.
I have an STM32 nucleo board, which I thought to use
in place of the old microcontrollers.It doesn't
cost a lot and has plenty of extra processing power, to add
more functions over time.
Cheers











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Hi Bob,

Great stuff, thanks for sharing the ASM code.

Already contains a  lot of useful comments.

I'll need to spend more time analysing that code;

I will maybe add more comments and upload my thoughts later.

Sure at that time uCtrl were written in ASM, but that's simply difficult to reuse on different platforms.

I may even consider to do a direct transcription into C.

KORG seem to have used a lot of 8049. To be able to upgrade without wire harness I've also already made adapter board layouts to go from 8049 to 8051 type footprint in DIL40. There are plenty of modern variants of 8051, and that's sort of a uCtrl I am familiar with. And c-compilers are also available. I can share that layout if someone is interested. By making the two serial ports pins available on an extra connector it can be easily extended with MIDI I-O.

Haitar

Hi Chip,

Yes, I have already read through your synth hacker blogs.

Very deep down stuff that you are doing. Kind off where I want to get to as well.

But to start with I make a clone first, then I will look to replace CPU and code.

By the way you asked for that signal MC, which is output from the uCtrl.

I actually cannot even find it anywhere else, can you?

When you built your code, did started off from the original assembler code,

or built it just from observing how the PS functions?

Especially for the Arpeggiator I would have thought that must be difficult to rebuild the original arpeggios, or not?

Haitar

Hi Chip,

Awesome!

For sure, the scanning of keyboard and front panel is a piece of cake.

But when it comes to assigning tones to voices there are different approaches.

And the icing on the cake must have been the arpeggiator.

Some guys have written, the POLYSIX arpeggiator is better than others.

Other places, some hickups are mentioned.

So did you make a side-side comparison of yours with the original Arpeggiator.

Or did you not go as far as that?

As for my clone works: I am now through 60% of the KLM-368 Chorus board.

Beautiful design, quite dense.  But certainly worth the one or other hack.

But once cloned could easily find it's way into other analogue synths!

When I've got the 100% clone ready, I will start with a derivative replacing

the 3 obsolete 30$ bucket-brigade chips with more recent variants.

I few quirks in the docs with a short in the schematic, or part names missing.

But while overlaying the my PCB layout over the scan from the service manual,

I was so far able to correct all that stuff!

Attached are 2 screenshots working on KLM-368 schematic and layout.

For the voice board KLM-366, I seem to be not the only one who would still appreciate

a good quality scan of the board traces, if someone would have some?

Cheers,

Haitar

Hi All,

Been asked for the DIP adapter from 8048 to 8051.

So here for the open source community, the complete file in Target 3001 format.

This layout editing software can be downloaded as a limited non-commercial format from here:

TARGET 3001! PCB Design Freeware is a Layout CAD Software|Support, Tutorials, Shop

Would  be glad to hear from people using that design.

Enjoy,

Haitar

On 2015-12-24, 17:57 grantbt@jps.net [PolySix] wrote:
>
>
> Hi,
>
> Very cool adapter. I also use the 8051 a lot, so I have a couple of
> questions.
>
> Regarding the adapter, is it possible to print a PDF of the schematic.
> That way we don't have to install the software and it's easier to see
> the adaptation than the actual PCB.
>
> Regarding compatibility, is the 8051 a superset of the 8048/49? Does it
> have mostly the same instruction set and peripherals?
>
> By the way, at my work we probably have some good quality 8048 tools
> (assembler, etc) on 5.25" floppies that I could probably attempt to
> read. I'm not sure if they are better than the "universal" assemblers
> I've seen. I think we even have an old ICE somewhere. What 40-pin DIP
> 8051 where you planning on using with your adapter? I like the newer
> ones that have built-in debugging rather than ICE.
>
> GB
>
>

Hi Grant,

No problem. I attach the adapter schematic as PDF.

However I can only recommend to also install the soft, very intuitive to use, and you can use it to make extensions.

For programming I've used various assemblers (TASM).

But over time it find it too tedious to do anything more complex.

ELEKTOR has issued good series of introduction into 8051 systems. 

There I made experience with AT89C8252/53.

Cool guys, ISP, with RAM, FLASH and EEPROM on board.

The right Connector for ISP-Programming could also be added to the adapter.

Otherwise there's also a cute PASCAL compiler (NILIPAS) for easy programming.

And for more serious stuff, Keil C compiler cool stuff, professional and widely usable.

 Cheers,

Haitar

Here the link to the download for the KEIL Development environment.

https://www.keil.com/demo/eval/c51.htm

Object code up to 2kByte can be generated for this free compiler, that should be quite a lot.

No need to say, the advantage of using C is simply that it can be reused for plenty of different uCtrollers. 

Cheers

Haitar