[Coco] 6809 Opcode informations...

[Walt Zydhek]

Check out the following links. Those sites have nearly all the info you need
on the 6809 and 6309 processors.

Motorola MC6809 Reference - http://www.maddes.net/m6809pm/
Hitachi HD6309 Reference - http://www.concentric.net/~Alxevans/6309/

-Walt Zydhek

-----Original Message-----
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
Behalf Of jens
Sent: Saturday, October 19, 2013 5:12 AM
To: 'Coco Email List'
Subject: [Coco] 6809 Opcode informations...


I need more detailed information about 6809 opcodes for DragonPy emulator.

They are many different informations sprayed around the internet. But my
question is if someone has structured data, which can be easily used in
python.

Currently i have some stuff collected here:

	https://github.com/jedie/DragonPy/tree/master/MC6809data

 From this i have generate the content of this:

	
<https://docs.google.com/spreadsheet/ccc?key=0Alhtym6D6yKjdFBtNmF0UVR5OW05S3
psaURnUTNtSFE>

the destination is to have this information about the opcodes:

* Does the opcode needs the memory content (byte/word) or just a ea?
* does the opcode writes the result back into memory (byte/word)

something like this:

...
'ADD': {'ADDA': {'desc': 'A = A+M',
                'operand': 'A',
                'ops': {0x8b: 'IMMEDIATE',
                       0x9b: 'DIRECT',
                       0xab: 'INDEXED',
                       0xbb: 'EXTENDED'},
                'read_from_memory': 'BYTE',
                'write_to_memory': '-'},
        'ADDB': {'desc': 'B = B+M',
                'operand': 'B',
                'ops': {0xcb: 'IMMEDIATE',
                       0xdb: 'DIRECT',
                       0xeb: 'INDEXED',
                       0xfb: 'EXTENDED'},
                'read_from_memory': 'BYTE',
                'write_to_memory': '-'},
        'ADDD': {'desc': 'D = D+M:M+1',
                'operand': 'D',
                'ops': {0xc3: 'IMMEDIATE_WORD',
                       0xd3: 'DIRECT',
                       0xe3: 'INDEXED',
                       0xf3: 'EXTENDED'},
                'read_from_memory': 'WORD',
                'write_to_memory': '-'}}, ...

My currently full list is here: https://gist.github.com/jedie/7054130


My current solution is simple: I look into the description of opcodes here: 
<https://github.com/jedie/DragonPy/blob/d0196f9843eac889456c2cee5a2f13047293
200b/MC6809data/MC6809_data2.py#L385-L490>

And the code for this:

     read_from_memory = "-"
     if "=" in desc:
         right = desc.split("=")[1]
         if "M:M" in right:
             read_from_memory = "WORD"
         elif "M" in right:
             read_from_memory = "BYTE"

     write_to_memory = "-"
     if desc.startswith("M:M"):
         write_to_memory = "WORD"
     elif desc.startswith("M ="):
         write_to_memory = "BYTE"


Has someone a complete information?


Mfg.


Jens Diemer

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