git.y1.nz

commit 421fd132e316c88defd80b60dff29210496b84fb
parent ceae5ecd4edd77df174a9b51c4558a4aa5d5ce06
Author: Lior Halphon <LIJI32@gmail.com>
Date:   Sat, 11 Oct 2025 19:43:27 +0300

Accurate PCM12 read for channel 2 on CGB-0 double speed

Diffstat:
M
Core/apu.c
4
++--

1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/Core/apu.c b/Core/apu.c
@@ -541,7 +541,7 @@ static void tick_square_envelope(GB_gameboy_t *gb, GB_channel_t index)
             gb->apu.pcm_mask[0] &= gb->apu.square_channels[GB_SQUARE_1].current_volume | 0xF1;
         }
         else {
-            gb->apu.pcm_mask[0] &= (gb->apu.square_channels[GB_SQUARE_2].current_volume << 4) | 0x1F;
+            gb->apu.pcm_mask[0] &= (gb->apu.square_channels[GB_SQUARE_2].current_volume << 4) | (gb->model == GB_MODEL_CGB_0? 0x3F : 0x1F);
         }
     }
     
@@ -568,7 +568,7 @@ static void tick_noise_envelope(GB_gameboy_t *gb)
     if (!(nr42 & 7)) return;
 
     if (gb->cgb_double_speed) {
-        gb->apu.pcm_mask[0] &= (gb->apu.noise_channel.current_volume << 4) | 0x1F;
+        gb->apu.pcm_mask[0] &= (gb->apu.noise_channel.current_volume << 4) | (gb->model == GB_MODEL_CGB_0? 0x3F : 0x1F);
     }
     
     if (nr42 & 8) {

This webpage is intended to be an accessible preview of this repository. To get a fuller picture, clone it and use the git CLI.