Help with troubleshooting MIDIBox SID

MIDIbox SID
1

Hi,

This morning I finally had the time to finish the basic steps of the MIDIBox SID. I have programmed the PIC with bootstraper and I easily transferred the MIOS (main.hex) and the 8085 application (setup_8580_without_cs.HEX). Full of  expectation I started the sequencer and heard… nothing… :-(  Maybe something didn’t quite work out with the programming… Should I restart the MIDIBox before transferring the application? By the way, how does the PIC differ between MOIS and the application?

After some troubleshooting I found that I had switched the MD and MU connections on the Core-card so I fixed this, but there is still no sound… Can anything have been damaged by this mistake?

Instead of the BC547 I use a BC550 which has the same pin configuration (please correct me if A’m wrong).

I will add, when this is up and working, controll buttons and a 2x40 LCD. But first I want to hear a sound from the SID.

Best regards

/Niklas

2

Hi!

Check your SID-Module,… everything soldered correctly… Crystal in the right Place( the “sharp” edge next to PWR in)…?

Mios and application uploaded correctly?

Sorry, nomore at the moment

pwx ???

3

Everything seems to be ok… A question about the 10k resistor that isn’t needed… Should I (as I have done) just leave it, or should I replace it with a bridge instead?

Another question about the chrystal, whichs seems to be correctly soldered. I use a 1.0MHz IQXO-350C… maybe this wasn’t a right choice?

/Niklas

4

the one thing that wouldn’t work for me was the SID crystal.

try removing the crystal on the SID chip and wiring core ic:17 to sid ic:6

that’s what worked for  me…