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The MCS-CRICKET player set the VBL as an interrupt source using the mouse firmware. This had several limitations, since it is only available on the //c but also because depending if the //c is a PAL or NTSC model it would produce a 50Hz or a 60Hz interrupt. This version uses the ACIA as an interrupt source instead making it also compatible with other Apple II models with a Super Serial Card. The interrupts are caused by a Cricket alarm set to 60Hz making it region independent as well.