Discussion about the Korg PolySix synthesizer

hi,

i had the same problems on my two Polysix.Changed the 74LS08, changed 
the DAC-Chip, changed nearly everything. Nothing worked. The Knob 
Mainboard with the 4051\ufffds are ok.. As the result i think that the 8048 
is/was defect.

The Arp knob works with a own Clock source (a NE555 clock source is 
located on the board which holds the knob and the other arp-switches).

At the end i gave it up, it was not worth to fix them. I study currently 
how the other Boards work and i have also putted a C64 into one Polysix 
and currently program a Synthesizer-Control program, first in BASIC to 
see if all works corretly, then in Assembler.. Why not? The Keyboard 
Connector fits really great into the C64\ufffds Keyboard Connector (instead 
of read out the C64-Keyboard i read out pressed keys) , you have to use 
three/four lines of the User-Port for Controlling the 4051\ufffds on the Knob 
Board, you have two Paddle-Inputs to read out the Knob-Data and the rest 
will be done with some external Chips. You have enough place for the 
Voltage converter, you have Tape in-out on the back side of the 
Polysix-Case for connecting directly to the C64, you have through the 
Arpeggiator a excellent 1-line Clock source, you can have also 
additonally a Video-out-signal to make show additionally a little 
Sequencer andandand....the very basic Synth works already, of course in 
a horrible response time (BASIC is slow, unfortunaly), but i work on it.....

  So i do my own Version of a C64-Syntehsizer. I call it "Polythree" ;)

Greetings

stef.


cjansson2003 wrote:

>What happens when I power on my Polysix is this: All led's lit up 
>steady except f\ufffdr the freq. led on the MW section. It starts
>blinking 
>slowly and speeds up until it's a steady light. Another exception is 
>the speed led on the arpeggiator section it blinks correct according 
>to the speed set on the nob. I guess the the synth i s stuck in the 
>reset mode witch should last a couple of seconds but I've waited for 
>houers. Of cource there is no sound what so ever. If I remember 
>correctly it started with a waiting time of a couple of minutes and 
>gradualy got worse over time. I have tryed the repare of a leaking 
>battery, and whas optemistic since there where at leased one trace 
>damaged. After first repair it still would'nt work so i ended up 
>replacing all traces around IC31 .... but no luck!
>
>So I'm hoping that anyone out there has a clue how to fix it. Maybe 
>there is some components at the reset circutes that has to changed.
>
>Thanks 
>
>Christer
>
>
>
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