diff --git a/z80.cpp b/z80.cpp
index 107e7e7..f2b59aa 100644
--- a/z80.cpp
+++ b/z80.cpp
@@ -643,7 +643,11 @@ namespace z80
         if (!iff1) return;
         exit_from_halt = true;
         PUSH(rPC);
-        rPC = 0x38;
+        if (im==1) {
+            rPC = 0x38;
+        } else if (im==2) {
+            rPC = (rI<<8) | 0xFF;
+        }
     }
 
     void RST(uint8_t vec)