diff --git a/blk/660 b/blk/660
index 2bb238b..dcc3342 100644
--- a/blk/660
+++ b/blk/660
@@ -1 +1 @@
-1 7 LOADR+
+1 8 LOADR+
diff --git a/blk/668 b/blk/668
new file mode 100644
index 0000000..f0d4735
--- /dev/null
+++ b/blk/668
@@ -0,0 +1,8 @@
+( a -- k12, absolute addr a, relative to PC in a k12 addr )
+: _r7ffc DUP 0x7ff > IF _oor THEN ;
+: _raddr12
+    PC - DUP 0< IF 0x800 + _r7ffc 0x800 OR ELSE _r7ffc THEN ;
+: RJMP ( a -- op ) _raddr12 0xc000 OR ;
+: RCALL ( a -- op ) _raddr12 0xd000 OR ;
+: RJMP, RJMP A,, ;
+: RCALL, RCALL A,, ;