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ehguacho
 Post subject: V and C flag emulation
PostPosted: Sun Jun 28, 2009 5:27 pm 
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Joined: Wed Jun 24, 2009 12:25 am
Posts: 29
hi! me again...
i'm having some problems while emulating the flags Carry and oVerflow. does anybody know an efficient way to emulate it? Or maybe somebody can explain me how these flags works, because i don't understand the docs i found (maybe my english level isn't very good? :( )
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BigEd
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PostPosted: Sun Jun 28, 2009 6:09 pm 
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Location: England
There are quite a few independent emulators out there, each will have source code to do exactly this. Reading the source is a good habit: you can always learn from other people's solutions.

You could start at http://6502.org/tools/emu/

Cheers
Ed
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Mike Naberezny
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PostPosted: Sun Jun 28, 2009 6:14 pm 
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You might want to read The Overflow (V) Flag Explained by Bruce Clark.

Regards,
Mike

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ehguacho
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PostPosted: Sun Jun 28, 2009 7:17 pm 
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thnaks fellas. lets see what comes out...
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bogax
PostPosted: Mon Jun 29, 2009 9:04 pm 
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Joined: Tue Nov 18, 2003 8:41 pm
Posts: 250
ehguacho wrote:
hi! me again...
i'm having some problems while emulating the flags Carry and oVerflow. does anybody know an efficient way to emulate it? Or maybe somebody can explain me how these flags works, because i don't understand the docs i found (maybe my english level isn't very good? :( )


V is the exclusive or of the carrys out of bits 6 and 7
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bogax
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PostPosted: Mon Jun 29, 2009 9:07 pm 
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Joined: Tue Nov 18, 2003 8:41 pm
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Mike Naberezny wrote:
You might want to read The Overflow (V) Flag Explained by Bruce Clark.

Regards,
Mike


I think there's a goof there (appendix A) :

"Sure enough, 171 is the unsigned number represented by $AB (10101001)"
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