Minor optimization to toggle

README.md

@@ -25,3 +25,7 @@ cc nasu.c -std=c89 -Os -DNDEBUG -g0 -s -Wall -L/usr/local/lib -lSDL2 -o nasu
 - `right-click`, remove pixel
 - `1 2 3`, select color
 - `q w e`, select tool
+- `ctrl+n`, clear
+- `ctrl+r`, rename
+- `ctrl+o`, load
+- `ctrl+s`, save

nasu.tal

@@ -36,7 +36,7 @@
 %INCR2 { SWP2 #0001 ++ SWP2 }
 %DECR2 { SWP2 #0001 -- SWP2 }
 %STEP8 { #33 SFT2 }
-%TOGGLE { DUP LDZ #00 = SWP STZ }
+%TOGGLE { LDZk #00 = SWP STZ }
 %GET-ITERATORS { SWP2k POP SWP POP } 
 
 %BANK { #2000 }