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´s 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´s 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´s 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 för 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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