Atari 2600模拟器Stella 2.7.7发布

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Atari 2600模拟器Stella发布新版，更新如下：

    * Corrected emulation of CPU opcodes involving 'decimal' mode (ADC/RRA and SBC/ISB). Special thanks to SeaGtGruff and others on the Stella mailing list for in-depth discussion and creation of test ROMs.
    * Fixed bug in F4SC bankswitching mode; writes to bankswitch addresses weren't triggering a bank switch.
    * Changed internal sound frequency of Pitfall 2 from 15.75KHz to 20KHz, as this sounds much more authentic when compared to a real cartridge.

http://stella.sourceforge.net/