Discussion about the Korg PolySix synthesizer

Hi,

>
>  Down the road I want to change CPUs as 8748s are getting harder to come
>by.  With a CPU change, I can start to do things like add MIDI, integrate
>the key assigner (a separate CPU on the KLM-366 board) and generally make
>things more efficient such as eliminate the battery-backed SRAM and use
>the new MCU's internal user data flashrom area to store patches..many more
>than 32 patches, btw.  
>
yes, maybe some Kind of a ATMEL MCU like the 8535 would me IMO 
interesting for this board cause of 8K Code Space, 512 Bytes of EEPROM 
(a bit few), 32 I/O-Lines, 3 PWM-Channels and eight 10-BIT A/D\ufffds. 
Additionally you have a SPI for in-System-Programming and afaik a 
programmable Serial Interface (so you can add easy a midi-Solution). 
Other Problem is that he is not Pin-compatible to the 8048, so a 
completely new (or re-wired Socket of IC22) Board would be a -must- for 
changing the MCU. On the other Hand i think that much Parts of the 
KLM-367 can be replaced with this MCU, like the variable Resistors for 
MG Level, PWM Rate etc. You have to use 6 A/D\ufffds for those resistors, one 
for reset_adj and additionally one for the Knob-Board (which needs afaik 
all in all 4 Adress lines; three for the 4051\ufffds, one for changing 
between both 4051\ufffds; and one Data-Line).

For additional functions would be much easier IMO to build a new Board 
from scratch with a new MCU and a own program (presupposed someone knows 
exactly which pin on which connector has which function)....

Otherwise, has anyone ever read out the 8048 and had a look into the 
code? I can program in Assembler; proably i can analyze the Code of the 
8048 and make it compatible to the 8535 with a few re-programming....i 
have two 8048\ufffds from two 367\ufffds here, but i can\ufffdt read them out, cause i 
have no Device to do so.....

Greetings

Stef