WTB: 55536 continuously variable slope delta modultaor chip

shardian

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WTB: 55536 continuously variable slope delta modultaor chip

This is basically a speech modulator chip used on Williams System 9 speech boards. I can't seem to find a place that sells it. Does anyone have a spare for some odd reason?
 
This may help.

http://www.pinrepair.com/sys11/index.htm

System 11 Speech Chip.
The speech chip used on the system11 sound boards is the Motorola HC-55536 or HC-55564. These are pretty difficult to find and are basically obsolete. Evan Oswald says there's a replacement, and it's the Motorola MC-3417 and the MC-3417L chips. However the MC-3417 is a 14 pin package, and the MC-3417L is a 16 pin package, and the MC-3417L (16 pins) seems easiest to find. The pinouts for the 16 pin package is the same as the 14 pin chip, if you hang pins 8 and 9 out of the socket. Pins 8,9 are not needed and don't need to be tied high or low because of the NC (Not connected) designation in the data sheet. The Data sheet is available at spies.com/~arcade/dataSheets/55564.pdf
 
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