Re: [cc65] C64 Cartridge clarifications

Okay....  What are the proper values for the EXROM and GAME status lines in the CRT format for generic 8k and 16k cartridges at $8000?  Also, what available modes would be good for >16k general-purpose cartridges, and how do I define/program them?  I appreciate the feedback.


----- Original Message -----
From: Uffe Jakobsen <uffe@uffe.org>
To: cc65@musoftware.de
Cc: 
Sent: Friday, March 9, 2012 4:23 PM
Subject: Re: [cc65] C64 Cartridge clarifications



Hi,

On 2012-03-08 08:46, skoe@directbox.com wrote:
>> > AFAIR there is a mistake or a fuzzy description of
>> > "active/inactive/1/0" in the CRT documentation or even in the CRT
>> > format, so be careful. A normal 16k Cartridge has both lines low.
>> 

I agree - the current wording around 0/1/inactive/active in the CRT documentation is quite confusing.

>> 
>>  and even worse, in vice - where one of the two is inverted (because the
>>  original AR works like that, and vice basically emulates AR only =P)
> 
> This reminds me to another thing: In the CRT/CHIP header these two lines
> are redundant information: The cartridge type (and therefore the emulation
> specific to this type) implies the state of these lines anyway. In many
> cartridges they are even dynamic, so the CHIP header can't know their
> state.
> 

I know this is getting more and more OT for this mailinglist (CC65). But this seems like the right place and moment to ask anyway - while we're at the topic of the CRT fileformat....

Regarding Ocean Type 1 cartridges (CRT ID 5) - have someone ever met anything else ?

I cannot find info about Ocean Type >= 2 anywhere...

It seems to me that someone in the beginning of time wanted to assign every Ocean cartridge combination its own type - and then regretted and squashed them all into one format (Ocean Type 1) - does anyone know or remember the actions and reasons ?

Also the updated CRT format file in the Vice svn-tree mentions an Ocean cartridge size of 32Kb... but it is certainly not an Ocean cartridge that I know of... have anyone ever met a 32Kb Ocean cartrigde in the wild ? As far as I know the list of known Ocean cartridges (12 pieces) have been complete for many years.

Thanks

/Uffe



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