[sdiy] Korg KLM-1050 delay PCB

NT nathan at idmclassics.net
Mon Jun 26 05:21:22 CEST 2023


They're "Korg ICs" but not totally proprietary... the upd-65010cw-113 in
these modules are NEC upd65000 series custom order gate arrays. I don't
know if they all have NEC branding or if any have Korg.

Nathan

On Sun, Jun 25, 2023 at 9:21 PM Adam (synthDIY) <synthdiy at adambaby.com>
wrote:

> I do love the sound of 1980s 12-bit delays!
>
> I have a variety of Rolands, but the Korg unit I have is a SDD-3000, quite
> a different animal (and looks to be actually 13-bit from the circuit).
> When you say "Korg ICs" , are there proprietary Korg chips in these things?
> Roland certainly got into this game, using the same chip across a variety
> of Boss products.
>
> A
>
> On 26 Jun 2023, at 5:23 am, NT <nathan at idmclassics.net> wrote:
>
> I got obsessed with this era of Korg delay since I first got a DSS-1.
> These are the same Korg delay ICs as used in the SDD-1000 and SDD-1200 dual
> version. I forget if the IC in the Poly 800 mk2 is the same or an adjacent
> version, but it's also very close.  I think these are just grimey and warm
> enough to get excited about if that's your sweet spot. The character they
> add to DSS-1 and Poly800 is very nice.
>
> At one point I was going to convert a DSS-1 delay board to be standalone
> until discovering it was also used in the 1000/1200. Thankfully nothing
> special is needed to control these - check out the SDD-1200 service manual
> for a basic implementation with a CV controlled clock source and
> modulation, and compare to the DSS-1 pdf pg22 to see whats missing on
> there. A lot of the front panel parts on the SDD are redundant for the
> second channel.
>
>
> https://www.synthxl.com/wp-content/uploads/2020/06/Korg-SDD-1200-ServiceManual.pdf
> http://www.buchty.net/korg/files/Korg%20DSS-1%20Service%20Manual.pdf
>
> Nathan
>
> On Wed, Jun 21, 2023 at 10:03 AM Roman Sowa <modular at go2.pl> wrote:
>
>> It uses masked ROM microcontroller made probably exclusively to KORG, so
>> unless someone searches forgotten cellars of KORG factory, no info will
>> ever come up.
>> Why don't you hook up logic analyser or a scope in working DSS-1? I
>> don't expect anything more complex than a few bytes sent only when
>> effect type is changed. Maybe with very few parameters too.
>>
>> But is it so impressive to make a module aout of it?
>> 12-bit digital delay from the 80's
>>
>> Roman
>>
>> W dniu 2023-06-21 o 13:46, mark verbos via Synth-diy pisze:
>> > Hi,
>> >
>> > I have a couple of KLM-1050 PCBs in a drawer in my shop. That’s the
>> delay board from the DSS-1, maybe others as the KLM-775. Over the course of
>> 20 years or so that these PCBs have lingered with me, I have occasionally
>> wondered if they could be turned into a standalone unit. Looking at the
>> schematic, the audio path in and out seems complete. The control of delay
>> time, feedback and effect level is on 3 digital pins labelled “DATA”,
>> “CLK”, and “STB”. Has anyone cracked the code to control these? It’s
>> outside my area of expertise, but maybe someone has taken a deep dive.
>> >
>> > Mark
>> >
>> >
>> >
>> >
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