Nintendulator 0.975 beta (2010/01/09) is released. Nintendulator is an open source Win32 NES emulator written in C (plus some assembly optimization). The original goal was to emulate the NES down to its hardware quirks; though it's fallen behind over the years, recent builds have caught up once again and can emulate certain behaviors most other emulators neglect to handle. However, this emulation precision comes at a price - a 1500MHz (estimated) or faster CPU is required to emulate at full speed.

Supported file formats include .NES, UNIF, FDS (fwNES format), and NSF. Mappers are handled using external DLLs, complete with extra sound channels for most games which provide them. Other notable features include writing to FDS images (by storing the differences in the SRAM folder), Game Genie support (limited to 3 codes), customizeable controllers (including 4 player), input movie recording and playback (with re-recording), AVI capturing, and a debugger.

The developer said:

January 9, 2010

As predicted, the process of converting the mapper DLL code from C to C++ introduced at least one bug, causing Namco 106 (iNES mapper 19) sound to break. The latest build includes mapper DLLs which fix this problem.

Download:Nintendulator 0.975 beta (2010/01/09)
Source:Here