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Subject: Re: [korgpolyex] Re: EX800 vs Poly800 Eprom differences

From: support <support@...>
Date: 2019-06-10

Hi there,

The CPU won't get any RES6.5 interrupts unless MIDI bytes are being received. And unless you're sending a large number of MIDI messages, you probably won't see the interrupts on your oscilloscope and definitely not on a logic probe.

The differences are minor. The board you're using is perfectly OK in an EX-800. The circuit diagram is identical between Poly-800 and EX-800.

The only difference in the code between the ROM's is that the Poly has keyboard scanning routines and EX-800 does not. And the EX-800 has sysex functions and the Poly-800 does not.

/Mike

On Sat, 2019-06-08 at 19:27 +0000, studio_1a@... [korgpolyex] wrote:
 

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?