VirtualC64 emulates a Commodore 64 personal computer on your Intel Macintosh OSx > 10.6.

I wrote the software with two major goals in mind. First, I wanted to create an emulator that can be used as a demonstrator program in a first year or second year course on computer engineering.

To achieve this goal, I have integrated various debugging capabilities that let you peek inside the CPU, RAM, ROM, or one of the custom chips. Second, I tried to make the emulator as user friendly as it can get.

In short: VirtualC64 tries to combine the ongoing fascination of the ancient Commodore computers with the great user experience of today’s Macs.

Bug fixes and enhancements:

• New screen geometry. New values reflect width, height, and aspect ratio of a real PAL or NTSC machine.
• Added controls for shifting and zooming screen borders.
• Improved drag’n'drop. Thumbnail images can now be dragged from one emulator window to another.
• Added finder icons for all supported document types.
• D64, T64, PRG, and P00 files can now be opened via the open file dialog (Open menu)
• New background texture and startup animation.

source: dirkwhoffmann.de