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PostPosted: Mon Apr 16, 2018 10:56 am 
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Location: Rio de Janeiro - Brazil
Even when using CHR-ROM, addresses $0000-$1FFF can be used to READ from the pattern tables, as some NROM and CNROM games did back in the day. Since these games had very limited PRG-ROM space, they used some of the CHR-ROM space to hold data.


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PostPosted: Mon Apr 16, 2018 2:28 pm 
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Location: cypress, texas
tokumaru wrote:
Even when using CHR-ROM, addresses $0000-$1FFF can be used to READ from the pattern tables, as some NROM and CNROM games did back in the day. Since these games had very limited PRG-ROM space, they used some of the CHR-ROM space to hold data.
That's really cool! Thank you for sharing, tokumaru! :D

I never thought of doing that :oops:; but, was pondering if we could somehow transfer bank15 from ROM to CHR-RAM to bank!15, our 15th bank if the P bit is set inside "CHR bank 0" (using SXROM), in ROM; but, that's not possible, I think, because ROM can only be set during assembly and RAM must be set after assembly.

There isn't ever a time when one could make a transfer from RAM to ROM. Remember learning that earlier in this thread, I think. :)


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PostPosted: Mon Apr 16, 2018 3:48 pm 
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unregistered wrote:
There isn't ever a time when one could make a transfer from RAM to ROM.

True of mask ROM, false of flash memory. Some recent homebrew games, such as Study Hall, save by writing back to flash instead of using battery RAM.


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