* [[Media:Sp0256al2 datasheet.pdf]] - includes AL2 allophone list
* [[Media:SP0256B datasheet Datasheet.pdf]] - includes info on TEST pin (but lacks the AL2 list)* [[Media:SP0250 Applications Manual .pdf]] - includes info on Voice Generator (of the older SP0250 chip) (the SP0256 works similar)* SPR016 datasheet [[Media:SPR-16 Datasheet.pdf]] - external 16Kbit ROM - includes info on program counter and stack (which seems to be part of the internal/external ROM, not of the CPU)* [[Media:SPR-032 datasheet 32 Datasheet.pdf]] - external 32Kbit ROM* [[Media:SPR-128 datasheet (older) Older.pdf]] - external 128Kbit ROM preliminary 28pin package with undefined pinouts* [[Media:SPR-128 datasheet (newer) Newer.pdf]] - external 128Kbit ROM preliminary 24pin package with defined pinouts
* SPB640 - external speech fifo
* US Patent 4,296,279 - might cover the SP0256 (not sure, it's in cryptic patent language)