Discussion about the Korg PolySix synthesizer

The Korg MCU is a masked part, so there would be no way to change it even if we 
figure out how.   One would need to reprogram an EPROM-based 8049 chip.  (not cheap, 
assuming you could find one)
Using a PIC would be a whole lot cheaper, although an external latch is needed
as the PIC is only a 28-pin chip so it doesn't have enough pins by itself.   An SMT
PIC could be used but that would put assembly out of reach for many people.

Another alternative would be the Teensy that GliGli used on the P600 project.
It's WAY overkill for this, but might just plug in, like it does for the Z80, if a few wires
are added.

I suspect figuring out an implementation that would be easy for people to do themselves
would be more difficult than finding the extra delay in the arpeggiator when it switches 
direction.

Bob

--------------------------------------------
On Fri, 12/18/15, James Matthew Smith jmsmatthewsmith@gmail.com [PolySix] <PolySix@yahoogroups.com> wrote:

 Subject: Re: [PolySix] New file uploaded to PolySix
 To: "PolySix@yahoogroups.com" <PolySix@yahoogroups.com>
 Date: Friday, December 18, 2015, 6:47 PM     
              
       Thanks Bob, this is really cool
 to see opened up, and even cooler is the fact that it exists
 and possibly can be modified to smooth that small timing
 hiccup.It's way over my head in terms of code
 though. It'd take me years to attempt to modify
 it. If it ends up you are somehow interested in
 looking into this, please let us/me know.
 
 On Fri, Dec 18, 2015 at
 4:17 PM, Dave Garfield daveogarf@yahoo.com
 [PolySix] <PolySix@yahoogroups.com>
 wrote:
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
 
 
   
 
 
     
       
       
       Thank you,
 Bob!Dave 
 
     On Friday, December
 18, 2015 12:04 PM, "PolySix@yahoogroups.com"
 <PolySix@yahoogroups.com>
 wrote:
   
 
  
  
 
 
 
   
 
 
     
       
       
       
 
 Hello,
 
 
 
 This email message is a notification to let you know that
 
 a file has been uploaded to the Files area of the PolySix
 
 group.
 
 
 
 File        : /klm8049.asm
 
   Uploaded by : bobgrieb <bobgrieb@yahoo.com>
 
   Description : Commented 8049 source code for PolySix Key
 Assigner MCU.   Comments are mine and may be incorrect.
 
 
 
 You can access this file at the URL:
 
 https://groups.yahoo.com/neo/groups/PolySix/files/klm8049.asm
 
 
 
 To learn more about file sharing for your group, please
 visit:
 
 https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398
 
 
 
 Regards,
 
 
 
 bobgrieb <bobgrieb@yahoo.com>
 
 
 
     
      
 
     
     
 
 
 
 
   
   
 
     
      
 
     
     
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
     
      
 
     
     
 
 
 
 #yiv4631428354 #yiv4631428354 --