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PostPosted: Mon May 13, 2019 12:13 pm 
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Formerly glutock
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Hi everyone,

Inspired from NovaSquirrel's work here, I added GTROM support to the Everdrive N8.

It doesn't support self-flashing yet, I'll have to add it later.

Don't forget to update your MAPROUT.BIN file in your EDFC folder. (write 0x6F at offset 0x6F)


Attachments:
File comment: Mapper 111 RBF file
111.zip [14.12 KiB]
Downloaded 22 times

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PostPosted: Mon May 13, 2019 2:54 pm 
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It's awesome!!

By the way, there's such a implementation of mapper 30 (UNROM 512) out there?


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PostPosted: Mon May 13, 2019 3:10 pm 
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That's great, thanks for making that! One day people will be able to release a mapper #111 ROM without fear of people saying "uh, how I do run this?". I think NEScape might might be the first game to use the 8 nametables.


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PostPosted: Mon May 13, 2019 5:19 pm 
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@Memblers

8 nametables? I guess I'm late on the news about mappers? ^^;; How does it work and what it the usage for? I guess there must be a thread on nesdev talking about it? I must have missed it.


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PostPosted: Mon May 13, 2019 6:01 pm 
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GTROM has two 8K banks of CHR RAM for pattern tables and two 7.75K banks of RAM for nametables. Each nametable bank consists of 4K at $2000 for a four-screen layout plus 3.75K of scratch space at $3000 that can be accessed during vblank or forced blank.

One four-screen layout in nametable bank 0 plus a second in nametable bank 1 equals eight screens.

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PostPosted: Mon May 13, 2019 7:23 pm 
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Yes I think this had been done before, but maybe there are differences in the implementation.

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PostPosted: Mon May 13, 2019 7:41 pm 
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Banshaku wrote:
@Memblers

8 nametables? I guess I'm late on the news about mappers? ^^;; How does it work and what it the usage for? I guess there must be a thread on nesdev talking about it? I must have missed it.


The main thread is kinda hidden in the Membler Industries section, it's all very disorganized:
https://forums.nesdev.com/viewtopic.php?f=4&t=12716

My original thinking with bankswitched nametables, is that it combines the advantage of 4-screen (being the PPU's native screen size) with the advantage of 1-screen mode (easier to scroll vertically with the status bar being in another bank).


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PostPosted: Mon May 13, 2019 7:54 pm 
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It's documented on the Wiki too:
https://wiki.nesdev.com/w/index.php/GTROM


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PostPosted: Mon May 13, 2019 8:04 pm 
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@Memblers

Ha, it the specification of your board, wasn't aware of all those details ^^;; I see.

@rainwarrior

I will check the wiki then. Thanks!


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