Undocumented 6809 Opcodes

#FILE: $RCSfile: undocops.txt $
#DESC: The 'Documented' Undocumented Illegal 6809 Opcodes
#REV: $Revision: 1.1 $
#DATE: $Date: 1995/08/18 14:39:40 $
#AUTHOR: Graham E. Kinns
#DISCLAIMER: All information provided as is etc.
#ARCHIVE: This file is part of the DRGNINFO collection of Dragon info files
#CONTACT: Comments, bugs, revisions, suggestions to Dragon@grempc.demon.co.uk
#HISTORY: 1.0 27/01/94 - Initial results typed up
#RCSID: $Id: undocops.txt 1.1 1995/08/18 14:39:40 Graham Exp $

These results were found by direct experiment on a 6809E in my Dragon using
Mike Kerry's DreamBug monitor on Rom.  

All cycles are assumed - I don't have any way of measuring them at present.

Page 1
======
                        
Op Mne		Mode	~	#	Comment

01 NEG		Direct	6	2	Same as op $00 (NEG <$xx)
02 NEG/COM	Direct	6       2	If cc.c = 0 then NEG <$xx (op $00)
					If cc.c = 1 then COM <$xx (op $03)
					(<$xx) = not(<$xx) + not(cc.c)
05 LSR		Direct	6	2	Same as op $04 (LSR <$xx)
0b DEC		Direct	6	2	Same as op $0A (DEC <$xx)

14 ??		} Seem to be interrupt related      
15 ??		}
18 ??
1b ??

38 CWAI		??	?	2	or something similar.  Doesn't
					alter any regs except CC.
3e RESET   Inherent  -	1	Forces internal Reset, disables 
					interrupts.
41 NEGA    Inherent  2       1       Same as 40
42 COMA    Inherent  2       1       Same as 43
45 LSRA    Inherent  2       1       Same as 44
4b DECA    Inherent  2       1       Same as 4a
4e CLRA    Inherent  2       1       Same as 4f

51 NEGB    Inherent  2       1       Same as 50
52 COMB    Inherent  2       1       Same as 53
55 LSRB    Inherent  2       1       Same as 54
5b DECB    Inherent  2       1       Same as 5a
5e CLRB    Inherent  2       1       Same as 5f

61 NEG     Indexed   6+      2+      Same as 60 - not tested
62 COM     Indexed   6+      2+      Same as 63 - not tested
65 LSR     Indexed   6+      2+      Same as 64 - not tested
6b DEC     Indexed   6+      2+      Same as 6a - not tested

71 NEG     Extended  7       3       Same as 70 - not tested
72 COM     Extended  7       3       Same as 73 - not tested
75 LSR     Extended  7       3       Same as 74 - not tested
7b DEC     Extended  7       3       Same as 7a - not tested

87 ??
8f ??

c7 ??
cd ??
cf ??

Page 2  (10xx)
======

1000 - 100f
1010    [Page switch 2][Page switch 2] - flowchart in data sheet suggests 
	any page switch code after the intial one are ignored
1011    [Page switch 2][Page switch 3] - same as [Page switch 2] 
1012 - 101f
1030 - 103e
1040 - 1082
1084 - 108b
108d
108f - 1092
1094 - 109b
109d
10a0 - 10a2
10a4 - 10ab
10ad
10b0 - 10b2
10b4 - 10bb
10bd
10c0 - 10cd
10cf - 10dd
10e0 - 10ed
10f0 - 10ff
      
Page 3  (11xx)
======

1100 - 110f
1110    [Page switch 3][Page switch 2] - same as [Page sw 3] 
1111    [Page switch 3][Page switch 3] - same as [Page sw 3] 
1112 - 113e
1140 - 1182
1184 - 118b
118d - 1192
1194 - 119b
119d - 11a2
11a4 - 11ab
11ad - 11b2
11b4 - 11bb
11bd - 11ff