SID gives me just a 1kHz tone

Testing/Troubleshooting
1

Hi,

I bulit myself a MIDIbox SID 6581 and for a friend a 8580, so I have two boxes for testing.

Here is my problem: when I connect the boxes, all I can hear is a 1000 Hz tone (maybe 2000) and the box won’t react to anything, be it a MIDI-keyboard or a patch from JsynthLib.

Regards, Florian

2

hey florian;

if you want some help; give us some more info

whats the hardware setup/ software versions u are using; PSU; have you got an lcd (which makes things way easier)? Does the core module work on itself?

cheers, marcel

3

I have two core modules, two SID modules (1x6851, 1x8580). (I have a third, unbuilt 8580-set as well)

Mike programmed the PICs for me and I don’t have a display, so far.

I’m using 8V DC for the core and 14V AC for the SID, supplied from the same toytrain-transformator (I tried it with a C64 PSU but got a loud buzzing noise, beside the 1kHz tone).

I connected the audio out to one of my guitar amps and the MIDI in to a keyboard or to a USB interface.

Metering the pins described in the documetation, I get the correct voltages.

How do I test the core unit?

Hope you can help me solve the problem, because two of the three synthies are for friends of mine.

Flo

4

I just have written a walkthrough which should give you some hints how to get the box running: http://www.ucapps.de/midibox_sid_walkthrough.html

My tip: start with the MIOS installation!

Best Regards, Thorsten.

5

Thanks a lot! :wink:

This walkthrough should be on top of the SID page, because I think, there are more people like me.

btw, how does the interconnection test work?

flo

6

btw, how does the interconnection test work?

Read the comments in main.asm of the interconnection test (http://www.ucapps.de/mios/mbsid_interconnection_test_b.zip).