Korg Poly800/EX800 Users

Hi, I now have a non-working stock EX-800 it fires up but no sound. Just wondering what are (if any) differences between the ex800 and poly800 Eproms. Obviously there is no joystick so the D/A calibration can be adjusted to 1.986v on IC10 pin7 but no upward/downward pitchbend...but wondering if I can swap a poly800 eprom in there OR install the EX800 motherboard in the poly800? Also noting that the midi is not working on the EX800. Circuit #20 EG control waveforms up to IC12 are ok so far..

Any help or ideas appreciated.

thanks

So, I've installed a poly-800 eprom marked #830236 into the EX800 and was able to calibrate the unit, all waveforms accounted for. The EX-800 eprom is marked #840206 is that the appropriate one..? if it is then it looks like its not good, Does someone have a BIN of the EX-800 eprom ??

Thank you

On Tue, 6/4/19, studio_1a@... [korgpolyex] <korgpolyex@yahoogroups.com> wrote:

Subject: [korgpolyex] Re: EX800 vs Poly800 Eprom differences
To: korgpolyex@yahoogroups.com
Received: Tuesday, June 4, 2019, 9:27 PM


 









So, I've installed a poly-800 eprom
marked #830236 into the EX800 and was able to calibrate the
unit, all waveforms accounted for. The EX-800 eprom is
marked #840206 is that the appropriate one..? if it is then
it looks like its not good, Does someone have a BIN of the
EX-800 eprom ??
Thank you










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So, I've installed a poly-800 eprom marked #830236 into the EX800 and was able to calibrate the unit, all waveforms accounted for. The EX-800 eprom is marked #840206 is that the appropriate one..? if it is then it looks like its not good, Does someone have a BIN of the EX-800 eprom ??

Thank you

On Tue, 6/4/19, support support@... [korgpolyex] <korgpolyex@yahoogroups.com> wrote:

Subject: Re: [korgpolyex] Re: EX800 vs Poly800 Eprom differences
To: korgpolyex@yahoogroups.com
Received: Tuesday, June 4, 2019, 10:23 PM


 

















I have them right here: http://www.hawk800.com/downloads/
/Mike
On Wed, 2019-06-05 at 01:27
+0000, studio_1a@... [korgpolyex]
wrote:
 






So, I've installed a poly-800 eprom
marked #830236 into the EX800 and was able to calibrate the
unit, all waveforms accounted for. The EX-800 eprom is
marked #840206 is that the appropriate one..? if it is then
it looks like its not good, Does someone have a BIN of the
EX-800 eprom ??
Thank you























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Thanks Mike, I'll program a new eprom and give that a try. Is that the only version/revision for the EX-800?

Do you know the checksum?

thx

 

Well after installing the newly programmed eprom it still did not work, but strangely enough it works fine with a Poly-800 eprom. I found another version of ex800 eprom, will try that tomorrow. I wonder if eprom labeled 840206 is correct one for ex800? 

 

Hey Mike, what I meant was, it fires up and all but there are no sounds even after I re-program a few sounds manually there's still nothing, the board is Klm596-7. I noticed that with the EX-800 eprom (now two different BIN files) I wasn't getting CPU Res6.5 but all other waveforms are present, So I went on a replaced a few IC's IC26, DTA1 and a few others but still no Res6.5. I popped in the Poly800 eprom and everything works CPU Res6.5 pulse is present from IC26 to IC24 and the few sounds I programmed manually are playing..I find this very strange that I have to use poly800 eprom, for me the differences should be minor between the two, but I don't understand, do you?

Ok this could turn out to be an interesting fact, I have captured all 11 waveforms from A>L from the KLM596 schematic on my Tektronix scope including the said CPU RES6.5 without any midi hookup at all and it looks identical, this from my POLY800 KLM596-4 w/830236 eprom(1). The EX800 KLM596-7 also works with the same eprom(1) and same waveforms confirmed.

Now, and I'm just trying to figure out the EX800 issue, is it then that because the EX800 does not have a keyboard the 63B50 waits on a keyboard pulse thru RX_data first to send /IRQ pulse to CPU RES6.5? I'm pretty sure the RES6.5 is necessary as I can witness this on my POLY800 without any midi,

Is that the correct process for the EX800 ?

Because I did hook up a controller keyboard to the EX800 and got no sounds from it even after manually programming a few, that's when replaced some IC's and finally swapped eproms and confirmed the KLM596-7(EX800 & eprom(1)) was working fine in my Poly800. Then programmed 2 new EX800 #840206 eproms and still no sound and no RES6.5,

Tonight, I will put the Poly800 aside and concentrate on the EX800 pulses,

I'm pretty sure its not the eprom but something has to give..

 

Ok this could turn out to be an interesting fact, I have captured all 11 waveforms from A>L from the KLM596 schematic on my Tektronix scope including the said CPU RES6.5 without any midi hookup at all and it looks identical, this from my POLY800 KLM596-4 w/830236 eprom(1). The EX800 KLM596-7 also works with the same eprom(1) and same waveforms confirmed.

Now, and I'm just trying to figure out the EX800 issue, is it then that because the EX800 does not have a keyboard the 63B50 waits on a keyboard pulse thru RX_data first to send /IRQ pulse to CPU RES6.5? I'm pretty sure the RES6.5 is necessary as I can witness this on my POLY800 without any midi,

Is that the correct process for the EX800 ?

Because I did hook up a controller keyboard to the EX800 and got no sounds from it even after manually programming a few, that's when replaced some IC's and finally swapped eproms and confirmed the KLM596 -7(EX800 & eprom(1)) was working fine in my Poly800. Then programmed 2 new EX800 #840206 eproms and still no sound and no RES6.5,

Tonight, I will put the Poly800 aside and concentrate on the EX800 pulses,

I'm pretty sure its not the eprom but something has to give..

 

Ok this could turn out to be an interesting fact, I have captured all 11 waveforms from A>L from the KLM596 schematic on my Tektronix scope including the said CPU RES6.5 without any midi hookup at all and it looks identical, this from my POLY800 KLM596-4 w/830236 eprom(1). The EX800 KLM596-7 also works with the same eprom(1) and same waveforms confirmed.

Now, and I'm just trying to figure out the EX800 issue, is it then that because the EX800 does not have a keyboard the 63B50 waits on a keyboard pulse thru RX_data first to send /IRQ pulse to CPU RES6.5? I'm pretty sure the RES6.5 is necessary as I can witness this on my POLY800 without any midi,

Is that the correct process for the EX800 ?

Because I did hook up a controller keyboard to the EX800 and got no sounds from it even after manually programming a few, that's when replaced some IC's and finally swapped eproms and confirmed the KLM596 -7(EX800 & eprom(1)) was working fine in my Poly800. Then programmed 2 new EX800 #840206 eproms and still no sound and no RES6.5,

Tonight, I will put the Poly800 aside and concentrate on the EX800 pulses,

I'm pretty sure its not the eprom but something has to give..

Well, I figured it out, the EX-800 eprom is actually working but slightly different that the Poly800 eprom.

I even installed poly800 keyboard in the EX800 and got my CPU RES6.5.. good to know!!

I'm certainly glad I figured it out on my own.

Have a good one

 

Well, I figured it out, the EX-800 eprom is actually working but slightly different that the Poly800 eprom.

I even installed poly800 keyboard in the EX800 and got my CPU RES6.5.. good to know!!

I'm certainly glad I figured it out on my own.

Have a good one