diff --git a/analyzer/hei_user_interface.cpp b/analyzer/hei_user_interface.cpp
new file mode 100644
index 0000000..0742d55
--- /dev/null
+++ b/analyzer/hei_user_interface.cpp
@@ -0,0 +1,77 @@
+/**
+ * @file These are the implementations of the user interfaces declared
+ *       in hei_user_interface.hpp
+ */
+
+#include <assert.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+#include <hei_user_interface.hpp>
+
+namespace libhei
+{
+
+//------------------------------------------------------------------------------
+
+bool registerRead(const Chip& i_chip, void* o_buffer, size_t& io_bufSize,
+                  uint64_t i_regType, uint64_t i_address)
+{
+    bool accessFailure = false;
+
+    assert(nullptr != o_buffer);
+    assert(0 != io_bufSize);
+
+    // TODO need real register read code
+    printf("registerRead not implemented\n");
+
+    return accessFailure;
+}
+
+//------------------------------------------------------------------------------
+
+#ifndef __HEI_READ_ONLY
+
+bool registerWrite(const Chip& i_chip, void* i_buffer, size_t& io_bufSize,
+                   uint64_t i_regType, uint64_t i_address)
+{
+    bool accessFailure = false;
+
+    assert(nullptr != i_buffer);
+    assert(0 != io_bufSize);
+
+    // TODO need real register write code
+    printf("registerWrite not implemented\n");
+
+    return accessFailure;
+}
+
+#endif
+
+//------------------------------------------------------------------------------
+
+// prints a single line to stdout
+void hei_inf(char* format, ...)
+{
+    va_list args;
+    fprintf(stdout, "I> ");
+    va_start(args, format);
+    vfprintf(stdout, format, args);
+    va_end(args);
+    fprintf(stdout, "\n");
+}
+
+//------------------------------------------------------------------------------
+
+// prints a single line to stderr
+void hei_err(char* format, ...)
+{
+    va_list args;
+    fprintf(stderr, "E> ");
+    va_start(args, format);
+    vfprintf(stderr, format, args);
+    va_end(args);
+    fprintf(stderr, "\n");
+}
+
+} // namespace libhei