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/* Technical Specifications */
The Music Machine incoporates two Ferranti devices for digital-to-analogue (DAC) and analogue-tod-digital (A to D) conversion. The part numbers are ZN429E8 and ZN449 respectively. The circuit also include a Motorola [[6850 ACIA chip]] (Asynchronous Communications Interface Adapter) for handling the MIDI channel, two anti-alias filters (one for input and one for output), a discrete microphone amplifier and a headphone amplifier. The clock signal for the ACIA and the ZN449 is provided by a ceramic oscillator.
The incomming incoming signal from the microphone amplifier is sampled to an 8-bit resolution at a rate of 19.444 thoudsand thousand samples per second. This yields an analogue bandwidth of approximately 9.5KHz which is in fact the cutoff frequency of the filters. The clock signal for the ACIA is '''unknown'''. As said above it is based one the same oscillator as used for the ZN449, however, the oscillator is probably some MHz (?) divided by whatever (?), and its unknown if the ACIA and ZN449 clocks are using the same divider (ie. the ZN449 uses 19.444kHz, but the ACIA may or may not use another frequency).
All of the devices on The Music Machine data bus are accessible to the Amstrad within its I/O space. ACIA transactions must use 16-bit IO instructions; the converters are accesible via 8-bit IO instructions.
