CCS64 is currently the best Commodore 64 emulator for Pentium boxes running MS-DOS. The author is Håkan Sundell <Hakan.Sundell@xpress.se>, and CCS64's home page is at http://www.fatal-design.com/ccs64/.
CCS64 is also available for some Unix variants, see http://www.funet.fi/pub/cbm/crossplatform/emulators/unix/.
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