AT&T Work Group System Voice Power voice processing boards for Unix PC 6300/7300 for sale

[Eric Smith]

Back when the Voice Power board for the 7300/3B1 UnixPC was of mainstream
interest, I spent some time trying to obtain specifications and programming
information regarding the Western Electric DSP20 chip it used. Unlike the
DSP16 and DSP32, WE (and AT&T Microelectronics) did not offer the chip for
sale, and the technical documentation was unobtanium.