SP0256 Pin-Outs

• SP0256
• SP0256 Voice Generator
• SP0256 Instruction Set
• SP0256 Allophones
• SP0256 Pin-Outs
• SP0256 on Printer Port (DIY)

SP0256 - Speech chip

 1 GND
 2 /RESET
 3 ROM DISABLE
 4 C1
 5 C2
 6 C3
 7 VCC1
 8 SBY
 9 /LRQ
 10 A8
 11 A7
 12 SER OUT
 13 A6
 14 A5
 15 A4
 16 A3
 17 A2
 18 A1
 19 SE
 20 /ALD
 21 SER IN
 22 TEST
 23 VCC2
 24 PWM OUT
 25 /SBY RESET
 26 ROM CLK
 27 OSC1
 28 OSC2

• 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).

SPR16 (16kbit) and SPR32 (32kbit) - External Serial-bus Speech ROM

 1 GND
 2 C3
 3 NC
 4 ROM CLK
 5..6 NC
 7 CS1
 8 /CS2
 9 /ROM ENABLE
 10 SERIAL OUT
 11 VCC
 12..13 NC
 14 SERIAL IN
 15 C1
 16 C2

SPR128 (128kbit) - External Serial-bus Speech ROM

 1 GND
 2 C3
 3 NC
 4 ROM CLK
 5..10 NC
 11 CS1
 12 /CS2
 13 /ROM ENABLE
 14 SERIAL OUT
 15 VCC
 16..21 NC
 22 SERIAL IN
 23 C1
 24 C2