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99 lines
4.7 KiB
Plaintext
99 lines
4.7 KiB
Plaintext
MoonShell extend link application converted by Moonlight.
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----------------------------------------------------------
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Title: NesterDS
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Version: 0.3
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Author: Rich Whitehouse
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Date: 2006-11-23
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Homepage: http://www.telefragged.com/thefatal/
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Additional thanks: Darren Ranalli (original author of Nester)
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Author of NesterDC (in case I used anything from that, I see
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it is in my old NesterGBA source folder)
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Authors of NDSLib and DSEmu
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Everyone else who has constributed to the wealth of knowledge
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available for DS homebrewing
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-------------------------------------------------------------------------------------
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Version 0.3 notes:
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------------------
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New this version:
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-Vastly improved compatibility by fixing several mapper problems.
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-Got rid of alternate-line rendering.
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-Lots of speed-ups (better DTCM management, changed screen writes to occur during
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actual scanline routines, lots of other stuff).
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-Converted code-base to pure C, moved to devkitARM r19b.
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There were lots of changes that I've forgotten about in here, this was sitting
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around on my hard drive half-finished for months. I was also working on converting
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expensive PPU routines to ARM, but that was also unfinished. The included source has
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some of the ARM routines that I did finish.
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Version 0.2 notes:
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------------------
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New this version:
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-Sound. Sound processing is done almost entirely on the arm7 and so comes with no
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noticeable performance penalty, and the actual sound processing is still faithful
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to the original nester core.
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-General performance improvements, and decent code cleanup.
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-Scanline speed hack disabled by default, makes lots of games work that were broken
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before. Said hack is still available as a toggle option.
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-Reset option (X+start).
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-Hardware scaling to fit output to DS screen resolution.
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-All options are now listed and updated when changed on the sub screen.
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-Made auto-framerate option work better.
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-Other things I was too lazy to make notes of.
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-50% more ninjas.
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Things I would like done but am currently too lazy to do:
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-Sound output is poppy when not at 44100, but defaults to 22050 because the arm7
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cannot handle the nester APU at 44100. Ideally, fix the poppiness.
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-SRAM support (should be fairly trivial to implement in existing code).
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-PPU has tons of code that could be hand-tweaked to provide massive speedups.
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Might also be worthwhile to render each scanline to a smaller chunk of faster
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memory and draw it to the screen buffer as the logic is performed, but this
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could be tricky to get right with vsync.
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-Support for extra mappers and sound processing.
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-Binaries are bloated due to bad use of global arrays tossed about. Fix.
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-Exponential increase in amount of ninjas.
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That will be all.
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Version 0.1 notes:
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------------------
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This is a DS port of Nester. As you might've guessed. There are a ton of issues, and
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it still bothers me that I'm storing the NES ROM over in ewram. I need to look into
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that gbfs stuff apparently. There is no sound (the APU stuff is hooked up and runs
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fine on the DS, it just needs the DS to actually do something with the output), but
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the games I've tried run ok speed-wise. There is some "scanline"-type rendering
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optimizaton in place because that's all still very slow and I haven't taken
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advantage of any DS-specific hardware features to speed it up.
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For compiling the actual code, I'm using DevKitARM R13, and there are some issues with
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the way the default ds_arm9 linker script shoves things into memory. For whatever
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reason, the default handling of non-static global variables is pretty wacked, and
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if you have more than 16k or so I've found that everything goes to hell (silent
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data collision, I'm guessing) and stuff just stops working, and some of the standard
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C runtime functions stop working. Just general bad things. So I had to manually change
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the linker script to move my .data into ewram and that seemed to solve everything.
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If you want to compile this yourself, be sure to change the batch files and makefile
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to use your own paths. Mine are all hardcoded because I'm a terrible person. Also,
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the code itself is all very messy, and torn apart. It's based on an old GBA port of
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Nester I made, and I ported it to the DS over a single weekend (so it hasn't had the
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tender loving care it deserves).
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To use the thing, you can use the crappy primitive ROM insertion tool included in the
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archive to put in the NES ROM of your choice. Currently only one ROM at a time is
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supported. If I ever stop being lazy and load ROM files from image ROM like I should
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be doing, that will be changing.
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Currently there aren't any emulators that really do a good job of running this. Out
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of them all IDeaS seems to do the best job. It probably goes without saying, but I
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have tested everything on actual DS hardware (using the wifime method) and it all
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works happily.
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So that's that, enjoy.
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