[Coco] MESS CoCo Emulation

Arthur Flexser flexser at fiu.edu
Tue Jan 15 02:16:18 EST 2013


Some cartridge games were protected from running from a RAM copy
transferred to the cartridge ROM area.  Does MESS simulate running the
cartridge from ROM, not from a RAM copy?  Canyon Climber, if I'm
remembering right, was written by Steve Bjork, who in his later
cartridge games put heavy protection to keep them from running from
RAM.  (Or does "verified cartridge image in CCC format" mean the
protection has already been removed?)

Art

On Mon, Jan 14, 2013 at 12:44 PM, Pete Rittwage <peter at rittwage.com> wrote:
> Thanks very much-
>
> I used a "verified" cartridge image in "CCC" format and attached it to
> regular CoCo emulation.  The screen appears briefly, then scrambles and
> locks up.  In the other emulations (CoCo2/3) the cartridge image doesn't
> boot at all, it is ignored.
>
> I haven't tried loading a disk version- I will find one and try that for
> comparison.
>
> I am using messui, but I thought I had similar behavior under plain mess.
> I will try again.
>
> It's probably not OK to attach the cart image here?  I can post the hash
> of it for verification. I know I've played the game probably a year ago or
> so.
>
> -Pete
>
> On Sun, January 13, 2013 7:35 pm, Robert Gault wrote:
>> Robert Gault wrote:
>>> Pete Rittwage wrote:
>>>> Is this broken for anyone else?
>>>>
>>>> I used to be able to play old CoCo games under MESS with no problem.
>>>> Today,
>>>> I fired up Canyon Climber and the screen just goes crazy.  Many other
>>>> games crash before the title screen.
>>>>
>>>> I'm not sure what the last version it worked was... I went from 0.148
>>>> back
>>>> down to 0.145 and all were broken.  There is nothing in the MameTesters
>>>> bug section, so I figured maybe I have some issue nobody else is
>>>> having?
>>>>
>>>> What is the last version to work, or is it just my setup?
>>>>
>>>> -Pete Rittwage
>>>>
>>>
>>> You will need to supply much more information to get a useful answer.
>>>
>>> 1) Which MESS, mess.exe or messui.exe?
>>> 2) URL for a test game, Canyon Climber or other. Are these tape or disk?
>>> 3) Settings used in MESS regards video, memory, disk access, etc.
>>> 4) Which emulation?
>>> 5) Anything else that might be relevant.
>>>
>>>
>>
>> To continue:
>> I found Canyon Climber on disk and tested it with MESS 0.148.
>>
>> CC needs to be LOADMed and then EXECed to start. It will not work with
>> Coco3
>> emulation on any MESS version I've tried. It works perfectly with MESS
>> 0.148
>> when the emulation is cocoe, coco2, or coco2b.
>>
>> Pete, you had better make sure if games can work on a Coco3 as many old
>> games
>> will not.
>>
>> Robert
>>
>>
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>
>
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