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/* Audio */
Although the base machine has only a simple binary toggle speaker, all versions of the machine other than the IIc provide expansion slots, allowing a large number of audio options to emerge.
Of those, the Mockingboard has the best game support. Various configurations of the Mockingboard were available with different combinations of [[PSG|AY]]-3-8910 ]] and speech synthesiser chips (Votrax SC-01 (or compatible)speech synthesiser chips, connected via 6522s which also provide timed interrupt sources for the CPU. The best-supported configuration carries two AY-3-8910s and two 6522s.
Some software products even supported more than one Mockingboard. Ultima V supported two boards, for a total of 12 voices, of which it used eight.
