diff --git a/compiler-interface/src/main/java/xsbti/CompilerInterface1.java b/compiler-interface/src/main/java/xsbti/CompilerInterface1.java
new file mode 100644
index 0000000..2ee4fb1
--- /dev/null
+++ b/compiler-interface/src/main/java/xsbti/CompilerInterface1.java
@@ -0,0 +1,37 @@
+/*
+ * Compiler Interface
+ *
+ * Copyright 2011 - 2019, Lightbend, Inc.
+ * Copyright 2008 - 2010, Mark Harrah
+ *
+ * Licensed under Apache License 2.0
+ * (http://www.apache.org/licenses/LICENSE-2.0).
+ */
+
+package xsbti;
+
+import xsbti.compile.*;
+import java.io.File;
+
+/**
+ * Compiler Interface as of Zinc 1.2.0.
+ */
+public interface CompilerInterface1 {
+  /** Returns a new compiler used for caching. */
+  CachedCompiler newCompiler(
+    String[] options,
+    Output output,
+    Logger initialLog,
+    Reporter initialDelegate
+  );
+
+  void run(
+    File[] sources,
+    DependencyChanges changes,
+    AnalysisCallback callback,
+    Logger log,
+    Reporter delegate,
+    CompileProgress progress,
+    CachedCompiler cached
+  );
+}
diff --git a/compiler-interface/src/main/java/xsbti/ConsoleInterface1.java b/compiler-interface/src/main/java/xsbti/ConsoleInterface1.java
new file mode 100644
index 0000000..486ec18
--- /dev/null
+++ b/compiler-interface/src/main/java/xsbti/ConsoleInterface1.java
@@ -0,0 +1,28 @@
+/*
+ * Compiler Interface
+ *
+ * Copyright 2011 - 2019, Lightbend, Inc.
+ * Copyright 2008 - 2010, Mark Harrah
+ *
+ * Licensed under Apache License 2.0
+ * (http://www.apache.org/licenses/LICENSE-2.0).
+ */
+
+package xsbti;
+
+/**
+ * Console Interface as of Zinc 1.2.0.
+ */
+public interface ConsoleInterface1 {
+  void run(
+    String[] args,
+    String bootClasspathString,
+    String classpathString,
+    String initialCommands,
+    String cleanupCommands,
+    ClassLoader loader,
+    String[] bindNames,
+    Object[] bindValues,
+    Logger log
+  );
+}
diff --git a/compiler-interface/src/main/java/xsbti/ScaladocInterface1.java b/compiler-interface/src/main/java/xsbti/ScaladocInterface1.java
new file mode 100644
index 0000000..20b5b27
--- /dev/null
+++ b/compiler-interface/src/main/java/xsbti/ScaladocInterface1.java
@@ -0,0 +1,18 @@
+/*
+ * Compiler Interface
+ *
+ * Copyright 2011 - 2019, Lightbend, Inc.
+ * Copyright 2008 - 2010, Mark Harrah
+ *
+ * Licensed under Apache License 2.0
+ * (http://www.apache.org/licenses/LICENSE-2.0).
+ */
+
+package xsbti;
+
+/**
+ * Scaladoc Interface as of Zinc 1.2.0.
+ */
+public interface ScaladocInterface1 {
+  void run(String[] args, Logger log, Reporter delegate);
+}