diff --git a/demos/misc/biffy_bifurcator.fur b/demos/misc/biffy_bifurcator.fur
index bc36b5aef..b77187e7e 100644
Binary files a/demos/misc/biffy_bifurcator.fur and b/demos/misc/biffy_bifurcator.fur differ
diff --git a/papers/format.md b/papers/format.md
index 58e30b441..5b05d7add 100644
--- a/papers/format.md
+++ b/papers/format.md
@@ -243,8 +243,10 @@ size | description
      |   - 0xd6: NDS - 16 channels
      |   - 0xd7: Game Boy Advance (direct) - 2 channels
      |   - 0xd8: Game Boy Advance (MinMod) - 16 channels
+     |   - 0xd9: Bifurcator - 4 channels
      |   - 0xde: YM2610B extended - 19 channels
      |   - 0xe0: QSound - 19 channels
+     |   - 0xf0: SID2 - 3 channels
      |   - 0xf1: 5E01 - 5 channels
      |   - 0xfc: Pong - 1 channel
      |   - 0xfd: Dummy System - 8 channels
diff --git a/src/engine/platform/bifurcator.cpp b/src/engine/platform/bifurcator.cpp
index 800f2b8f9..fbe10020a 100644
--- a/src/engine/platform/bifurcator.cpp
+++ b/src/engine/platform/bifurcator.cpp
@@ -54,7 +54,7 @@ void DivPlatformBifurcator::acquire(short** buf, size_t len) {
     for (int i=0; i<4; i++) {
       chan[i].audSub+=chan[i].freq;
       if (chan[i].audSub>=65536) {
-        long long newx=(long long)chan[i].curx*(chan[i].param+65536)/32768;
+        int64_t newx=(int64_t)chan[i].curx*(chan[i].param+65536)/32768;
         newx*=65536-chan[i].curx;
         chan[i].curx=(int)(newx/65536);
         chan[i].audSub&=65535;
diff --git a/src/engine/sysDef.cpp b/src/engine/sysDef.cpp
index b7c62a9cf..af775e108 100644
--- a/src/engine/sysDef.cpp
+++ b/src/engine/sysDef.cpp
@@ -2092,7 +2092,7 @@ void DivEngine::registerSystems() {
   );
 
   sysDefs[DIV_SYSTEM_BIFURCATOR]=new DivSysDef(
-    "Bifurcator", NULL, 0xf2, 0, 4, false, true, 0, false, 0, 0, 0,
+    "Bifurcator", NULL, 0xd9, 0, 4, false, true, 0, false, 0, 0, 0,
     "a fantasy sound chip using logistic map iterations to generate sound.",
     {"Channel 1", "Channel 2", "Channel 3", "Channel 4"},
     {"CH1", "CH2", "CH3", "CH4"},