diff --git a/sid.4th b/sid.4th
new file mode 100644
index 0000000..29e8368
--- /dev/null
+++ b/sid.4th
@@ -0,0 +1,17 @@
+\ PS2!     c c p-addr --   Data byte (A), high address byte (B), port address (C) - OUT to port with A and B registers set
+: PC2! SWAP >< OR PC! ; 
+\ SIDSEND  c c --          Data value, register (0-31); bits 5,6 are for interrupt settings; bit 7 (/CS) is handled
+: SIDSEND 2DUP 128 OR 84 PC2! 2DUP 127 AND 84 PC2! 128 OR 84 PC2! ;
+\ SIDRST   --              Reset SID chip
+: SIDRST 0 24 SIDSEND 0 4 SIDSEND ;
+: SIDTEST 15 24 SIDSEND  10 0 DO 255 0 DO I 1 SIDSEND LOOP LOOP 0 24 SIDSEND ;
+
+SIDRST 
+15 24 SIDSEND 
+0 5 SIDSEND 
+240 6 SIDSEND 
+17 4 SIDSEND 
+
+SIDTEST
+
+