<p>Mockingboards can be plugged into slots 4 and/or 5 of the Apple II.</p>
<p>Each Mockingboard is a type 'C': 2x AY-3-8913 (3-channel sound generator) & 2x SSI263 (speech chip)<br>
Each AY-3-8913 is fully emulated (tone, noise & envelope).<br>
Each SY6522 (that controls an AY-3-8913) can generate precise timer interrupts or phoneme-complete interrupts.<br>
Emulation of the SSI263 is basic at the moment and only plays back phonemes at a fixed rate without any support for inflection or filters.<br>
Additionally the Votrax/SC-01 (predecessor to the SSI263) is emulated by remapping Votrax phonemes to the SSI263's.<br>
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NB. Some Mockingboard compatible software requires the card to be in a specific slot (usually slot 4).<br>
Some software will allow the user to pick the slot, and better software will auto-detect the slot.
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<h4>Phasor:</h4>
<p>Phasors can be plugged into slots 4 and/or 5 of the Apple II.</p>
<p>A Phasor is roughly equivalent to 2 Mockingboards and has 4x AY-3-8913.<br>
It powers up in a hardware-identical mode to the Mockingboard type 'C', and so is compatible with all Mockingboard titles.<br>
Using software (to access memory mapped I/O) it can be switched to native Phasor mode (4x AY8913s) or Echo+ mode (but without the TMS5220 speech chip).