ACID64 Player

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ACID64 Player is a music player application by the High Voltage SID Collection team-member Wilfred Bos, that plays Commodore 64 music files through an MOS Technology SID sound interface device chip, using an instruction cycle-based emulation of the C64's core processors to achieve true fidelity.

The player currently runs only on the Microsoft Windows platform, with no support for other platforms planned. As the emulation engine is coded in x86 assembly, practical porting would be limited to IBM PC compatibles.

ACID64 Player requires a connection to a SID chip, either through a HardSID card, or a CatWeasel controller unit connected to the computer. The emulation engine is quite CPU-intensive, but the aural results are likely the closest achievable to a real C64.^{[citation needed]} NTSC and PAL frequency speeds are accurately emulated. The program has a basic GUI for control, and supports many Windows integration abilities.

The latest version of the program is v2.0.3, released 2005-01-01. It may be used freely, but must be distributed in its original archive. The source code, which is assembly for the emulation cores and Delphi for the GUI, has not been released.