via http://www.emucr.com/

NeoGPC v1.1 is released. NeoGPC is a NeoGeo Pocket Color emulator with the intention of becoming accurate enough to emulate the NGPC bios and properly run all games and homebrew. NeoGPC will also include a debugger with breakpoints and all of the necessary pieces to accurately create NGPC homebrew.

NeoGPC v1.1 Changlog:
- The TLCS900h debugger is in a semi-working state, so I thought I'd release something.
- Breakpoints, stepping into opcodes, watching registers, etc. all seem to be working fine.
- Lots of improvement to be made, but its starting to come together.

https://code.google.com/p/neogpc/