Discussion about the Korg PolySix synthesizer

Hello All,

I have just joined the group. Its great to see there's a worldwide community for the Polysix.

On the other hand the big attraction of that vintage machine,

has let the price explode within just a few years.

Hard to get a hand on one below 1000 Euros these days.

I own already a couple of POLY 61 which can still be got around 200 Euros,

which is a very reasonable pricing.

So while I cannot afford the tag for a full Polysix,

I've got plenty of 2nd hand components to make synth of my own, and i thought

Why not build a Polysix clone from scratch?

Some may think I am crazy? But why not?

When you have a database of all PCBs with schematic and layout,

it's a piece of cake to replace one CPU by another, add mods, hacks, MIDI etc,

without ending in a mess of cables and PCB stacks..

I am skilled in using PCB schema and layout design.

So I got schemas and layouts of KLM 369, 370, 371 already together.

Now I want to get going with the bigger PCBs.

However what I need are good quality photos of existing PCBs from above and from below.

In addition I've need a scan of a SM where the PCB traces are resolved better than on the copy that I have.

So if the one or other of you had such photo or scans, I would be more than  happy.

If someone was interested I will for sure share my layouts and schemas with you.

Native format is TARGET3001, which you can get for free as pin-limited version.

Cheers,

Tarek 

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

Subject: [PolySix] Polysix Full Clone
To: PolySix@yahoogroups.com
Date: Saturday, December 12, 2015, 6:39 AM


 









Hello All,
I have just joined the
group. Its great to see there's a worldwide community
for the Polysix.
On the other hand the big
attraction of that vintage machine, has
let the price explode within just a few years.
Hard to get a hand on one below 1000
Euros these days.
I own already a couple of
POLY 61 which can still be got around 200 Euros,
which is a very reasonable
pricing.
So while I cannot afford
the tag for a full Polysix, I've got
plenty of 2nd hand components to make synth of my own, and i
thought
Why not build a Polysix
clone from scratch?
Some may think I am crazy?
But why not?
When you have a database of
all PCBs with schematic and
layout,it's a piece of cake to
replace one CPU by another, add mods, hacks, MIDI etc,
without ending in a mess of cables and
PCB stacks..
I am skilled in using PCB
schema and layout design.So I got
schemas and layouts of KLM 369, 370, 371 already
together.
Now I want to get going
with the bigger PCBs. However what I
need are good quality photos of existing PCBs from above and
from below.In addition I've need a
scan of a SM where the PCB traces are resolved better than
on the copy that I have.
So if the one or other of
you had such photo or scans, I would be more than 
happy.
If someone was interested I
will for sure share my layouts and schemas with
you.Native format is TARGET3001,
which you can get for free as pin-limited
version.
Cheers,
Tarek 









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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

On Sat, 12/19/15, tlule@gmx.de [PolySix] <PolySix@yahoogroups.com> wrote:

Subject: Re: [PolySix] Re: Polysix Full Clone
To: PolySix@yahoogroups.com
Date: Saturday, December 19, 2015, 1:06 PM


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












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Hi Arp,

I had seen your post, that your're also working on cloning on some of the boards.

I want to keep you updated, on my work in parallel. As said I've already got a clone of the KLM-371.

It is already readily usable, but I decided to cleanup the PCB traces abit more.

Here the status what the PCB looks like.

Cheers