lol i corrected it for you
Ill have a look at it. Give me a few minutes
Cool stuff keep us posted
ok lets start easy. try changing R229 to 2K2 and see how the situation improves. Remember to stick the cart in slot 1
Hi @Daemos,
would it be possible to put another resistor in parallel instead of replacing R229? I did the math and it would be around 4k1 resistor if I'm not mistaken.
@Guillian
Would you mind sharing the analog output schematic of the MFR SCC+ here so we can check if there's any conflict?
Just the analog circuit path, like we published for the PHC-70FD.
@Daemos
Comparing the PHC-70FD with the FS-A1WX schematics, it seems to be missing a pull-down resistor for each slot in the soundin pin. Could that be the cause of the problem?
would it be possible to put another resistor in parallel instead of replacing R229? I did the math and it would be around 4k1 resistor if I'm not mistaken.
no problem. Give it a try.
Comparing the PHC-70FD with the FS-A1WX schematics, it seems to be missing a pull-down resistor for each slot in the soundin pin. Could that be the cause of the problem?
The pull down resistor I believe you speak off are to make a 0 point in the audio signal. This is allready done with R127.
Lets wait out the results for the quick fix.
@sd-snatcher: there is no analog part in the cartridge.The sound output pin from the FPGA is connected to sound pin of the cartridge.
there is no analog part in the cartridge.The sound output pin from the FPGA is connected to sound pin of the cartridge.
That explains a few problems for some MSXes. I wonder if the FPGA's sound output is open collector as well.
Sorry to disturb You,
in my mind I thought many MSXs have sound problems when mixing sounds because each has different audio mixer circuit,
for instance Philips VG-8020 shunts AUDIO IN from both cartridge slots, so when both AUDIO IN are excited, one drain from the other, and audio mixer OP-AMP received lowered imputs.
It is sound mixing sources balancing, it should be preferred controlled but MSX hardware doesn't do this job.
Sorry to disturb You,
in my mind I thought many MSXs have sound problems when mixing sounds because each has different audio mixer circuit,
for instance Philips VG-8020 shunts AUDIO IN from both cartridge slots, so when both AUDIO IN are excited, one drain from the other, and audio mixer OP-AMP received lowered imputs.
It is sound mixing sources balancing, it should be preferred controlled but MSX hardware doesn't do this job.
correct