Short GBC ROM to test how different emulators handle the DAA opcode

Install the appropriate version of Cygwin for your system architecture (i.e. if you're running 32-bit Windows, download the 32-bit setup.exe).

In the Cygwin installer, select the following packages: python 2.7.* git make gettext.

Launch Cygwin. Thence...

Open Terminal. Thence...

... run the following commands:

git clone https://github.com/bentley/rgbds
cd rgbds
make
make install
cd ..
git clone --recursive https://github.com/pikalaxalt/daa_test
cd daa_test
make

Launch the resulting file daa_test.gbc in any Gameboy emulator. When the ROM says "DAA TEST COMPLETE!", look for a file called daa_test.sav in whatever directory your emulator is configured to save battery files.

Some emulators such as VisualBoy Advance (VBA) do not support cartridges with always-accessible SRAM. If the .sav file does not appear, the output is also stored in WRAM (c000 - dfff) in the same byte order as it would appear in the .sav file. You can create a manual dump of WRAM to record the output.