First post, by Deksor
- Rank
- l33t
Hello !
I finally finished assembling my snark barker (except for the CMS chips because I need to wait for the sockets to arrive) !
After checking nothing was shorted, I installed it in a computer.
Unfortunately, the card isn't 100% working. OPL2 is working, so that's a good new, because it means that some of the logic and the amplifier section is working allright. What doesn't work is the DSP.
So I used SBDIAG for troubleshooting.
"DSP Address Test" is working, I can see the pulse on pin 1 of U19 on my vintage 20MHz oscilloscope.
"DSP Write Test" is where things seem to fail. I can't see anything there. All I see is the signal being stuck to high. However I can hear in the audio output that something is happening. (A very slight noise when the test runs)
Is my 20MHz oscilloscope too slow to view the signal ? Is there a problem ?
Any hints to figure out what could be wrong ?
Here's a picture of my completed card :
Thanks !
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