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The Serial Port Dual Serial Board (top)
The Serial Port Dual Serial Board (back)
The Serial Port Dual Serial Board (bottom)
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 (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.