[Korg] [Trinity] – [Bad PCM]
Hi,
I have a korg Trinity with bad PCM. Is there a way to figure out which chip is the culprit ,and, can the ROM content be sourced from somewhere to flash it back ?
A different subject, i want to reverse engineer the Trinity OS and Modify it. Any advices, useful info, recommendations ? . i’m handy with electronics and have done some programming so can figure things out as i go.
Thanks
What any tech will do is use an oscilloscope to back trace the audio signal from the output jack back to the input and see where the signal should be - and isn’t.
As far as reverse engineering the OS, Unless you have the ability to download code from a protected chip, AND have a Logic Analyzer with enough inputs to cover every pin on the CPU, you won’t be able to. With ROM chips you need to replace the entire chip, but you can only get unprogrammed chips from the manufacturer, who will never sell you just one. You need to buy in the thousands.
You could buy several CS-80’s for that price, if you could get them.
Thanks for your reply. As mentioned my issue was not audio path related. It was incorrectly played PCM sample where some were good and others scrambled.
I took a few high resolution photos and went through them . Found what i suspected two damaged traces around the PCM chip. Verified there was no continuity and fixed them. It is Working now.
Regarding the reverse engineering, luckily the Trinity has multiple OS versions available to download (executable/binary format i assume). However, i can’t find any info on the CPU and needles to say a disassembler software to convert the executable to assembly. I’ll slowly keep looking into it.
Just throwing this out there,
If the OS was done by a group outside Korg, have you contacted them for help, OR you can ask if they can do the mods you want. May cost some donation money, but that would be the fastest route to achieve what you want.
Good Luck.