Changes

* The oscillator should be usually 3.12MHz(in practice, it's often different).* Allows to output sounds up to 5kHz (ie. the output is updated at 10kHz rate).* The SP0256 is reportedly expandable to "491 K of ROM" (probably bullshit).* The SP0256B is reportedly expandable to "480 K of ROM" (probably K=Kbits).* The TEST pin of the SP0256 chip can be used (among others) to dump its internal ROM. Note: Details on TEST are found in the "SP0256B" datasheet - but not in the "SP0256" datasheet - not sure if the pin works identical for both chip types, nor if there's a difference between them at all. == External ROMs == For curiostiy, below are the pin-outs for external speech ROMs (though none of the known speech interfaces for the CPC uses them).