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  The Serial Port Dual Serial Board

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 The Serial Port Dual Serial board top

 The Serial Port Dual Serial Board (top)

 The Serial Port Dual Serial Board back

 The Serial Port Dual Serial Board (back)

 The Serial Port Dual Serial Board bottom

 The Serial Port Dual Serial Board (bottom)

The Serial Port Dual Serial Issue 2 card top

The Serial Port Dual Serial & Printer Board Issue 2 (top) 

  The Serial Port Dual Serial & Printer Board Issue 2 back

 The Serial Port Dual Serial & Printer Board Issue 2 (back)

 The Serial Port Dual Serial & Printer Board Issue 2 bottom

The Serial port Dual Serial & Printer Board Issue 2 (bottom) 

The first 3 pictures are of an Issue 1 Dual Serial board which has the power distribution modification applied (see wire on the bottom of the board). It has ROM version B0.37 These boards have a maximum speed of 115,200 bps. The second 3 pictures are of an Issue 2 Dual Serial & Printer Board with ROM version 0.41. I am not sure where the printer support is. These boards have a maximum speed of 230400 bps.

Later serial cards were produced by Atomwide . Detail of the Atomwide card is HERE .

Issue 1 & 2 boards only work in RiscPCs if the EPROM is removed and the driver softloaded. The latest drivers for Issue 1 & 2 cards is HERE .

Further details of the Dual Serial Board and the driver software are available on Hugo Fiennes  web site.