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Some 5576 cables seems to have pin 6 connection to drive internal speaker from PS/55 host.[1]And Pin 2 and 6 of normal PS/2 connector are not usually connected, while some apparatus(PC, Laptop, cable or converter) use those pins to support both keyboard and mouse with one port at same time.[2]I guess speaker of your keyboard is driven via clock signal of mouse from your PC or PS/2-USB converter.[1] http://sandy55.fc2web.com/still_crazy/0307.html#0729%20keyboard_5_5576_spcable[2] http://www.burtonsys.com/PS2_keyboard_and_mouse_mini-DIN-6_connector_pinouts.html