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F18A MK2

F18A VDP 9918A

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#351 matthew180 OFFLINE  

matthew180

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Posted Sun Dec 2, 2018 10:37 PM

Oh, I did not know that.  Thanks for the heads up, I'll have to go look at the datasheet again.



#352 Asmusr OFFLINE  

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Posted Sun Dec 2, 2018 11:55 PM

Bah, why does it have to be only in *some* modes?  That just makes it easier to have bugs in both software and the hardware.

 

The modes where it doesn't auto-increment R14 are the 'old' modes (GM1, GM2, MC, TXT40). If it did then software relying on wrapping around within a single memory page would stop working. 



#353 matthew180 OFFLINE  

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Posted Mon Dec 3, 2018 9:43 AM

Thanks. I did read that after I posted my objection, and it does make sense.





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