Re: Detect a C128 from C64 mode

From: Greg King <>
Date: Fri, 24 May 2013 12:42:06 -0400
Message-id: <4D469FD36F304421821B198576F065B0@Kaiser>
From: "Segher Boessenkool"; on Thursday, May 23, 2013; at 3:02 PM -0400
>>> Or, if you return in the carry flag instead of in .A:
> [This is not what I wrote; please don't edit quotes].

I am like a newspaper; I always edit to improve clarity.

>>> _c64_check:
>>>    asl $d030
>>>    ror $d030
>>>    rts
>> I was thinking of a C-callable library function:
> Is there a standard C ABI for 6502?  I have never seen one, do
> you have a link perhaps?

In this case, I meant that I never have heard of any C ABI that uses a status register to return the result of an expression. 
Instead, they put some value into a data register.  Silverdr did that in his code; so, I assumed that it is what he wanted. 

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Received on 2013-05-24 19:01:35

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