nesdev.com

Thanks for the answer. I will look into it and see if ORing the signals works better. Meanwhile, I found out that using a 74HC138 does, for whatever reason, work (maybe it's timing related?). I have a setup where I stream 8-Bit data off a microcontroller to the SNES. It has an output clock that is c...

I have a 74LS139 decoder that is supposed to generate a signal when 0x8000-0xFFFF is read. I use the following setup: 74LS139 ___ ___ | v | VCC -|1 16|- VCC -|2 15|- /RD -|3 14|- /CART -|4 13|- GND -|5 12|- => /RD_CART -|6 11|- -|7 10|- GND -|8 9|- --------- Yet somehow the data does not reach the S...

I have made a small tool to fix the internal GameBoy ROM Header. It's a simple single source file compiled with g++ (or any other c++ compiler).
You can find the tool here: https://github.com/elseyf/gbfix

How do I compile this to a .gb or .gbc to play it im a fan of bad apple and really want to see this in action Sorry for the belated answer. I have uploaded the assembler I used to compile the binary, you can get it here: https://github.com/elseyf/bass-m To assemble, you just call bass-m with the ma...

Something I worked on for the past few weeks: https://github.com/elseyf/Bad-Apple-for-DMG-GameBoy Copied from the README: Bad Apple Demo for the DMG GameBoy System - by el_seyf Demonstrates video playing capabilities of the GameBoy The Video is encoded to 160x72 pixels, playing at 15fps and is strec...

dougeff wrote:Has anyone tried the official WDC C compiler? The website claims it to be free.

http://www.westerndesigncenter.com/wdc/tools.cfm

I tested it some time ago. Unfortunately it produced wrong code when using arrays of chars (if I remember correctly). I gave up on it assuming more errors were waiting.

I guess you could have a CPU only working with basic MOVE instructions, mapping the ALU in memory. It would only need additional hardware to process conditionals. This was done on x86, see here . Of course there are many considerations on how to design the CPU in order to know which instructions you...

Said project source can be found here: https://github.com/elseyf/Rex-Runner-NES
It does contain some useful code, mainly packed into macros, so anyone can look into it and extract anything useful. No license, no worries

I just looked into it, when downloading the windows snapshot from sourceforge you do get a recently compiled snapshot (mine is from Jul 18, 2017). --version flag result in following output: ca65.exe V2.16 - Git 6002e59 make sure to use this link https://sourceforge.net/projects/cc65/files/latest/dow...

Nice demo!
I wrote a BF Interpreter for SNES using 1kB in total for a contest held some time ago: SNESF1k

This sounds interestening. Is the CIC Firmware going to be open source, and if so, is it supplied in a manner that it could be easily worked into a custom program running on the mcu? I see this as a free means to do some basic DRM protection for a new homebrew game, the mcu could interface some addi...

If you need some project idea for an Arduino, you could try and build either a wireless Controller, or a Controller to USB adapter. I am currently on building the first; a wireless SNES Controller, with Mouse support using a laser mouse (I found a PS/2 Mouse that uses a laser for movement detection)...

I see, then the greenpak is really only suited to replace the gluelogic NES mappers, or implement your own "not-so-comlicated" mapper. It doesnt seem to be suited for for the LO/HIROM switch either, as you pointed out, it might be just more efficient to remap all data on the ROM, so that a single mu...

I have got several questions: Is there enough logic on a greenpak to support a full MMC1 replacement? I do see that MMC3 wouldn't be possible due to available resources, but how about using several, how many would be needed? And is there a way to synthesize logic from code, or do you have to use the...

I have written some custom bootloader for the SMP. Maybe the code will help. The SMP can do indirect 16 Bit addressing, you would need to write something like this: ldy ($xx),y Where $xx is in the page0 memory space (I am not sure it needs to be page0 or page1, but I guess it is like the 6502, where...