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Acorn ACD05 Risc PC 16bit sound upgrade (front)
Acorn ACD05 Risc PC 16bit sound upgrade (back)
The early Risc PC 600s only had 8bit sound as Acorn once again saved a few pence here and there to keep the price down. The first Risc PC 600s didn't have the pins for connections (e.g. my original Risc PC 600 with an Issue C motherboard), Issue D motherboards have the relevant pins, so the 16 bit sound upgrade can be installed.
The Acorn Risc PC 16-bit Sound Upgrade software disc is HERE , it has the SoundDMA and Player support modules and !Player and an updated Replay !ARPlayer application.
Here are the Acorn 16-bit Audio Card Release Note and Acorn 16-bit Audio Card User Guide .