git.y1.nz

commit 2d766982799b03c4333b6784593c903f54d55e45
parent d67580c96405c7ee07168b3dcedd7a29d4b18041
Author: Lior Halphon <LIJI32@gmail.com>
Date:   Sun, 31 Jan 2021 19:17:26 +0200

Emulation of NR43 bit 3 glitch on CGB-C and older

Diffstat:
M
Core/apu.c
10
+++++++++-

1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/Core/apu.c b/Core/apu.c
@@ -1209,7 +1209,15 @@ void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
             }
             /* Step LFSR */
             if (new_bit && (!old_bit || gb->model <= GB_MODEL_CGB_C)) {
-                step_lfsr(gb, 0);
+                if (gb->model <= GB_MODEL_CGB_C) {
+                    bool previous_narrow = gb->apu.noise_channel.narrow;
+                    gb->apu.noise_channel.narrow = true;
+                    step_lfsr(gb, 0);
+                    gb->apu.noise_channel.narrow = previous_narrow;
+                }
+                else {
+                    step_lfsr(gb, 0);
+                }
             }
             break;
         }

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