I’ve found couple of confusing points when connecting SID to CORE.
I’ve got SID R3A and Core R4D, and their interconnection ports look like this
What is “MD” that doesn’t exist on SID board?
Does the SID’s “VC” stand for vdd like the same spot on the Core?
Frankly speaking: which pin connects to which pin? And is there some other pins on the board that should be connected to Core<->SID board?
Thanks in advance!
I think you should try it this way when I look on the schematics:
Core Sid
Vd - Vc
Clk - Clk
MU - MU
MD - Sc
Vs - Vs
Rc - Rc
So - So
Greetings
Yes, it should be a 1:1 connection.
Best Regards, Thorsten.
Thanks, I’ve now connected them like above, but get no sound out of 6581. Testtone application doesn’t say anything, and interconnection test gives quite odd values, any ideas what might cause that? Here’s couple examples:
Pin: A0
CS# 7,5V
RES# 5,14V
A0 5,14V
A1 5,14V
A2 5,14V
A3 5,14V
A4 5,14V
D0 5,14V
D1 5,14V
D2 5,14V
D3 5,14V
D4 5,14V
D5 5,14V
D6 5,14V
D7 5,14V
Pin: RES#
CS# 7,5V
RES# 5,14V
A0 0V
A1 5,14V
A2 0V
A3 0V
A4 5,14V
D0 0V
D1 0V
D2 0V
D3 0V
D4 0V
D5 0V
D6 0V
D7 0V
Pin: D0
CS# 7,5V
RES# 5,14V
A0 0V
A1 0V
A2 0V
A3 5,14V
A4 5,14V
D0 0V
D1 0V
D2 0V
D3 0V
D4 0V
D5 0V
D6 0V
D7 0V
Pin: D3
CS# 7,5V
RES# 5,14V
A0 5,14V
A1 5,14V
A2 5,14V
A3 5,14V
A4 5,14V
D0 5,14V
D1 5,14V
D2 5,14V
D3 5,14V
D4 5,14V
D5 5,14V
D6 5,14V
D7 5,14V
Have you meassured the voltage for the sid chip? You should have 12V for the 6581.
Greetings
Yes, those are the measured voltages on the SID chip.
As it’s said in the main.asm file “By default all unselected pins are 0V, except for the CS# pin which is 5V”. On my circuit the CS# is too high, and all the pins are giving volts.
I have 12V for the 6581, like it’s instructed:
IC1:Vdd(28) and IC1:Vss(14) - it must be 12V for the 6581 SID
IC1:Vcc(25) - IC1:Vss(14) = 5V
IC2:Vdd(16) - IC2:Vss(8) = 5V
IC3:Vdd(16) - IC3:Vss(8) = 5V
Please upload the interconnection test again and try it again. Perhaps diconnect the midi out cable from the core modul after uploading the application, so we can see that there´s no midi loop which controlls the application.
Good luck! 
Haha, actually my Core module is not sending anything from midi (and that’s another problem solving episode), so loop is not possible. I’ve uploaded the applications without smart mode.
But I’ll try what you’ve suggested.
edit: Is it normal, that when you’re running interconnection test, and scroll up-down the modulation wheel in MIOS studio, the LCD on core gets nuts and gives only black bars on the upper row? 
I’m I having a crazy PIC or what.
No, this isn’t normal - the LCD output should be stable.
Best Regards, Thorsten.