Hey guys,
I'm getting no sound on the following setup.
Board: MV-1FZ with 5V Mod and Stereo MKL mod.
Note: I'm testing with the MVS sound test (no cartridge).
My oscilloscope was already showing no sound coming out from the YM2610 and its pin 56 (IRQ going to Z80) was not responsive when activating sound on left/right/center (while it's clearly responsive on my working board).
I've changed the YM2610 with a new one but the exact some problem is persisting.
I'm trying to go up to the Z80 the Neo-D0 and eventually the processor 68k, but I found very difficult to follow the audio flow from the beginning.
For example, in the Z80 pins 1 to 5 are outputting something significant in my working board, but not in my broken one. But I'm not sure what's the meaning of that.
Can anyone help me in this scenario??
Thanks.
PS.: On the schematics of the Neo-D0, pin 61 is supposed to be A4 (68k address line) according to this https://wiki.neogeodev.org/index.php?title=NEO-D0, but both on my working and non-working board it's ground (??).
I'm getting no sound on the following setup.
Board: MV-1FZ with 5V Mod and Stereo MKL mod.
Note: I'm testing with the MVS sound test (no cartridge).
My oscilloscope was already showing no sound coming out from the YM2610 and its pin 56 (IRQ going to Z80) was not responsive when activating sound on left/right/center (while it's clearly responsive on my working board).
I've changed the YM2610 with a new one but the exact some problem is persisting.
I'm trying to go up to the Z80 the Neo-D0 and eventually the processor 68k, but I found very difficult to follow the audio flow from the beginning.
For example, in the Z80 pins 1 to 5 are outputting something significant in my working board, but not in my broken one. But I'm not sure what's the meaning of that.
Can anyone help me in this scenario??
Thanks.
PS.: On the schematics of the Neo-D0, pin 61 is supposed to be A4 (68k address line) according to this https://wiki.neogeodev.org/index.php?title=NEO-D0, but both on my working and non-working board it's ground (??).