diff --git a/bsnes/Database/Super Famicom.bml b/bsnes/Database/Super Famicom.bml
index 6567fc09e..3dd5a0f71 100644
--- a/bsnes/Database/Super Famicom.bml	
+++ b/bsnes/Database/Super Famicom.bml	
@@ -30,6 +30,30 @@ game
       size: 0x80000
       content: Program
 
+//Prototypes (USA)
+
+database
+  revision: 2022-03-14
+
+game
+  sha256:   4362afe51da8a01a67a1c2d6c2545d9e7cbaf8c42fd8f319dd8b61fe328512e1
+  name:     Super FX voxel demo
+  title:    Super FX voxel demo
+  label:    Voxels in progress
+  region:   USA
+  revision: 1.0
+  board:    GSU-RAM
+    memory
+      type: ROM
+      size: 0x60000
+      content: Program
+    memory
+      type: RAM
+      size: 0x10000
+      content: Save
+    oscillator
+      frequency: 21440000
+
 //Super Comboy (KOR)
 
 database
diff --git a/bsnes/sfc/coprocessor/superfx/memory.cpp b/bsnes/sfc/coprocessor/superfx/memory.cpp
index 01a8c8210..58a54df29 100644
--- a/bsnes/sfc/coprocessor/superfx/memory.cpp
+++ b/bsnes/sfc/coprocessor/superfx/memory.cpp
@@ -5,16 +5,19 @@ auto SuperFX::read(uint addr, uint8 data) -> uint8 {
       synchronizeCPU();
       if(synchronizing()) break;
     }
-    return rom.read((((addr & 0x3f0000) >> 1) | (addr & 0x7fff)) & romMask);
+    addr = (((addr & 0x3f0000) >> 1) | (addr & 0x7fff));
+    addr = Bus::mirror(addr, rom.size());
+    return rom.read(addr);
   }
 
   if((addr & 0xe00000) == 0x400000) {  //$40-5f:0000-ffff
+    addr =  Bus::mirror(addr, rom.size());
     while(!regs.scmr.ron) {
       step(6);
       synchronizeCPU();
       if(synchronizing()) break;
     }
-    return rom.read(addr & romMask);
+    return rom.read(addr);
   }
 
   if((addr & 0xe00000) == 0x600000) {  //$60-7f:0000-ffff