diff --git a/m68k.risu b/m68k.risu
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index 0000000..3317005
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@@ -0,0 +1,241 @@
+###############################################################################
+# Copyright (c) 2016 Laurent Vivier
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Eclipse Public License v1.0
+# which accompanies this distribution, and is available at
+# http://www.eclipse.org/legal/epl-v10.html
+###############################################################################
+
+.mode m68k
+
+# abcd $dx,$dy
+ABCD  M68000 1100 Dx:3 10000 0 Dy:3 \
+                 !constraints { \
+                        write_movb_di($Dx, rand(10) | (rand(10) << 4)); \
+                        write_movb_di($Dy, rand(10) | (rand(10) << 4)); \
+                        1;\
+                      }
+# add $dx,$dy
+ADD   M68000 1101 Dx:3 0 opmode:2 000 Dy:3 \
+                 !constraints { $opmode != 0b11; }
+# adda $dx, $ay
+ADDA  M68000 1101 Ax:3 size:1 11 000 Dy:3
+# addi #Imm, $dx
+ADDIB M68000 00000110 00 000 Dx:3 00000000 data:8
+ADDIW M68000 00000110 01 000 Dx:3 data:16
+# addq #Imm3, $dx
+ADDQ  M68000 0101 imm:3 0 size:2 000 Dx:3 \
+                 !constraints { $size != 0b11; }
+# addx $dx,$dy
+ADDX  M68000 1101 Dx:3 1 size:2 00 0 Dy:3 \
+                 !constraints { $size != 0b11; }
+# and $dx, $dy
+AND   M68000 1100 Dx:3 0 opmode:2 000 Dy:3 \
+                 !constraints { $opmode != 0b11; }
+# andi #Imm,$dx
+ANDIB M68000 00000010 00 000 Dx:3 00000000 data:8
+ANDIW M68000 00000010 01 000 Dx:3 data:16
+# andi #imm,ccr
+ANDICCR M68000 0000001000111100 data:16 \
+                 !constraints { write_mov_ccr(rand(0x100)); 1; }
+# asl/asr $dx,$dy , asl/asr #im3,$r
+ASx   M68000 1110 count:3 d:1 size:2 i:1 00 r:3 \
+                 !constraints { $size != 0b11; }
+# bchg $dx,$dy
+BCHG  M68000 0000 Dx:3 101 000 Dy:3
+BCHGI M68000 0000 100  001 000 Dx:3 0000000 data:9
+# blcr $dx,$dy
+BCLR  M68000 0000 Dx:3 110 000 Dy:3
+BCLRI M68000 0000 100  010 000 Dx:3 0000000 data:9
+# bfchg $dx,offset:width
+BFCHG M68020 1110101011 000 Dx:3 0000 Do:1 offset:5 Dw:1 width:5 \
+                !constraints { (!$Do || $offset < 8) &&          \
+                               (!$Dw || $width < 8);             \
+                             }
+# bfclr $dx,offset:width
+BFCLR M68020 1110110011 000 Dx:3 0000 Do:1 offset:5 Dw:1 width:5 \
+                !constraints { (!$Do || $offset < 8) &&          \
+                               (!$Dw || $width < 8);             \
+                             }
+# bfexts $dx,offset:width,$dy
+BFEXTS M68020 1110101111 000 Dx:3 0 Dy:3 Do:1 offset:5 Dw:1 width:5 \
+                !constraints { (!$Do || $offset < 8) &&          \
+                               (!$Dw || $width < 8);             \
+                             }
+# bfextu $dx,offset:width,$dy
+BFEXTU M68020 1110100111 000 Dx:3 0 Dy:3 Do:1 offset:5 Dw:1 width:5 \
+                !constraints { (!$Do || $offset < 8) &&          \
+                               (!$Dw || $width < 8);             \
+                             }
+# bfffo $dx,offset:width,$dy
+# there is a bug in 68040 with offset > 31
+BFFFO M68020 1110110111 000 Dx:3 0 Dy:3 Do:1 offset:5 Dw:1 width:5    \
+                !constraints {                                        \
+                               if ($Dw == 1) { $width &= 0x7; ;}      \
+                               if ($Do == 1) {                        \
+                                   $offset &= 0x7;                    \
+                                   write_mov_di($offset, rand(0x20)); \
+                               }                                      \
+                               1;                                     \
+                             }
+# bfins $dx,offset:width,$dy
+BFINS M68020 1110111111 000 Dx:3 0 Dy:3 Do:1 offset:5 Dw:1 width:5 \
+                !constraints { (!$Do || $offset < 8) &&          \
+                               (!$Dw || $width < 8);             \
+                             }
+# bfset $dx,offset:width
+BFSET M68020 1110111011 000 Dx:3 0000 Do:1 offset:5 Dw:1 width:5 \
+                !constraints { (!$Do || $offset < 8) &&          \
+                               (!$Dw || $width < 8);             \
+                             }
+# bftst $dx,offset:width
+BFTST M68020 1110100011 000 Dx:3 0000 Do:1 offset:5 Dw:1 width:5 \
+                !constraints { (!$Do || $offset < 8) &&          \
+                               (!$Dw || $width < 8);             \
+                             }
+# bset $dx,$dy
+BSET  M68000 0000 Dx:3 111 000 Dy:3
+BSETI M68000 0000 100  011 000 Dx:3 0000000 data:9
+# btst $dx,$dy
+BTST  M68000 0000 Dx:3 100 000 Dy:3
+BTSTI M68000 0000 100  000 000 Dx:3 0000000 data:9
+# clr $dx
+CLR   M68000 01000010 size:2 000 Dx:3 \
+                 !constraints { $size != 0b11; }
+# cmp $dx,$dy
+CMP   M68000 1011 Dx:3 0 size:2 000 Dy:3 \
+                 !constraints { $size != 0b11; }
+# cmpa $dx,$ay
+CMPA  M68000 1011 Ax:3 size:1 11 000 Dy:3
+# cmpi #Imm, $dx
+CMPIB M68000 00001100 00 000 Dx:3 00000000 data:8
+CMPIW M68000 00001100 01 000 Dx:3 data:16
+# divs $dx,$dy
+DIVS  M68000 1000 Dy:3 111 000 Dx:3 \
+                 !constraints { \
+                        write_mov_di($Dx, rand(0xffffffff) + 1); \
+                        1;                                       \
+                      }
+# divsl $dx,$dr:$dq
+DIVSL M68020 0100110001 000 Dx:3  0 Dq:3 1 size:1 0000000 Dr:3 \
+                 !constraints { \
+                        write_mov_di($Dx, rand(0xffffffff) + 1); \
+                        1;                                       \
+                      }
+# divu $dx,$dy
+DIVU  M68000 1000 Dy:3 011 000 Dx:3 \
+                 !constraints { \
+                        write_mov_di($Dx, rand(0xffffffff) + 1); \
+                        1;                                       \
+                      }
+# divul $dx,$dr:$dq
+DIVUL M68020 0100110001 000 Dx:3  0 Dq:3 0 size:1 0000000 Dr:3 \
+                 !constraints { \
+                        write_mov_di($Dx, rand(0xffffffff) + 1); \
+                        1;                                       \
+                      }
+# eor $dx,$dy
+EOR   M68000 1011 Dx:3 1 size:2 000 Dy:3 \
+                 !constraints { $size != 0b11; }
+# eori #Imm, $dx
+EORIB M68000 00001010 00 000 Dx:3 00000000 data:8
+EORIW M68000 00001010 01 000 Dx:3 data:16
+# eori #imm,ccr
+EORICCR M68000 0000101000111100 data:16 \
+                 !constraints { write_mov_ccr(rand(0x100)); 1; }
+# exg $dx,$dy
+EXG_d M68000 1100 Dx:3 1 01000 Dy:3
+# exg $ax,$ay
+EXG_a M68000 1100 Ax:3 1 01000 Ay:3
+# exg $dx,$ay
+EXG   M68000 1100 Dx:3 1 01000 Ay:3
+# ext $dx
+EXT   M68000 0100100 opmode:3 000 Dx:3 \
+                 !constraints { $opmode == 0b010 || $opmode == 0b011 }
+EXTB  M68020 0100100 111 000 Dx:3
+# lsl/lsr $dx,$dy , lsl/lsr #im3,$r
+LSx   M68000 1110 count:3 d:1 size:2 i:1 01 r:3 \
+                 !constraints { $size != 0b11; }
+# move $dx,$dy
+MOVE  M68000 00 size:2 Dy:3 000 000 Dx:3 \
+                 !constraints { $size != 0b00; }
+# movea $dx,$ay
+MOVEA M68000 00 size:2 Ay:3 001 000 Dx:3 \
+                 !constraints { $size != 0b00 && $size != 0b01; }
+# move ccr,$dx
+MOVEFROMCCR  M68010 0100001011 000 Dx:3
+# move $dx,ccr
+MOVETOCCR M68000 0100010011 000 Dx:3
+# moveq #Imm8, $dx
+MOVEQ M68000 0111 Dx:3 0 data:8
+# muls $dx,$dy
+MULS  M68000 1100 Dy:3 111 000 Dx:3
+# mulsl $dx, $dh:$dl
+MULSL M68020 0100110000 000 Dx:3 0 Dl:3 1 size:1 0000000 Dh:3
+# mulu $dx,$dy
+MULU  M68000 1100 Dy:3 011 000 Dx:3
+# mulul $dx, $dh:$dl
+MULUL M68020 0100110000 000 Dx:3 0 Dl:3 0 size:1 0000000 Dh:3
+# nbcd $dx
+NBCD  M68000 0100100000 000 Dx:3 \
+                 !constraints { \
+                        write_movb_di($Dx, rand(10) | (rand(10) << 4)); \
+                        1;                                              \
+                      }
+# neg $dx
+NEG   M68000 01000100 size:2 000 Dx:3 \
+                 !constraints { $size != 0b11; }
+# negx $dx
+NEGX  M68000 01000000 size:2 000 Dx:3 \
+                 !constraints { $size != 0b11; }
+# nop
+NOP   M68000 0100111001110001
+# not $dx
+NOT   M68000 01000110 size:2 000 Dx:3 \
+                 !constraints { $size != 0b11; }
+# or $dx,$dy
+OR    M68000 1000 Dy:3 0 size:2 000 Dx:3 \
+                 !constraints { $size != 0b11; }
+# ori #Imm, $dx
+ORIB M68000 00000000 00 000 Dx:3 00000000 data:8
+ORIW M68000 00000000 01 000 Dx:3 data:16
+# ori #imm,ccr
+ORICCR M68000 0000000000111100 data:16 \
+                 !constraints { write_mov_ccr(rand(0x100)); 1; }
+# rol/ror $dx,$dy , rol/ror #im3,$r
+ROx   M68000 1110 count:3 d:1 size:2 i:1 11 r:3 \
+                 !constraints { $size != 0b11; }
+# roxl/roxr $dx,$dy , roxl/roxr #im3,$r
+ROXx  M68000 1110 count:3 d:1 size:2 i:1 10 r:3 \
+                 !constraints { $size != 0b11; }
+# sbcd $dx,$dy
+SBCD  M68000 1000 Dx:3 10000 0 Dy:3 \
+                 !constraints { \
+                        write_movb_di($Dx, rand(10) | (rand(10) << 4)); \
+                        write_movb_di($Dy, rand(10) | (rand(10) << 4)); \
+                        1;                                              \
+                      }
+# Scc $dx
+SCC M68000 0101 cond:4 11 000 dx:3 \
+                 !constraints { write_mov_ccr(rand(0x100)); 1; }
+# sub $dx,$dy
+SUB   M68000 1001 Dx:3 0 opmode:2 000 Dy:3 \
+                 !constraints { $opmode != 0b11; }
+# suba $dx, $ay
+SUBA  M68000 1001 Ax:3 size:1 11 000 Dy:3
+# subi #Imm, $dx
+SUBIB M68000 00000100 00 000 Dx:3 00000000 data:8
+SUBIW M68000 00000100 01 000 Dx:3 data:16
+# subq #Imm3n $dx
+SUBQ  M68000 0101 imm:3 1 size:2 000 Dx:3 \
+                 !constraints { $size != 0b11; }
+# subx $dx,$dy
+SUBX  M68000 1001 Dx:3 1 size:2 00 0 Dy:3 \
+                 !constraints { $size != 0b11; }
+# swap $dx
+SWAP  M68000 0100100001000 Dx:3
+# tas $dx
+TAS   M68000 0100101011 000 Dx:3
+# tst $dx
+TST   M68000 01001010 size:2 000 Dx:3 \
+                 !constraints { $size != 0b11; }
