diff --git a/source/instr.key b/source/instr.key
--- a/source/instr.key
+++ b/source/instr.key
@@ -20,6 +20,10 @@
 # DISCLAIMER: THE WORKS ARE WITHOUT WARRANTY.
 
 00
+ZX OP_ALL, OP_ALL, OP_ALL, OP_ALL
+ZY OP_ALL, OP_ALL, OP_ALL
+ZZ OP_ALL, OP_ALL
+ZA OP_ALL
 01 OP_ALL+OP_AX, OP_ALL+OP_IMM			;add,adc,and,or,sub, ...
 02 OP_M_SRC_DST, OP_ALL+OP_RM, OP_ALL+OP_IMM	; add, adc, and, or, sbb, sub, xor
 82 OP_M_SRC, OP_ALL+OP_RM, OP_ALL+OP_IMM	; cmp, test