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WANTED: Power supply for Atari / TI / TRS80 acoustic coupler

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I am looking for an acoustic coupler power supply for the Atari 830 Modem, the TRS80 Interface II Modem, Cat Novation model CAT Novation 490190 modem, or TI-99/4A Phone Modem (part 490267-4).


Note I am only looking for a single power supply, all of the listed modems are the same product with cases custom designed for various computer manufacturers.


Preference would be for the Ti-99/4A branded modem power supply, or the Cat Novation part #901017 (this was the manufacturer of all of these variants) .


Considering that this item no longer suits any real world purpose, I am looking in the $12-$15 US price range max.



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