In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

It is a bit hard to sort out from the text as the final Chapter Seven is really the only discussion of the board.  The first six chapters are mostly print head fundamentals and how to use the print head with a BasicStamp.

Most importantly, the board is preloaded with the program, EEPROM si preloaded with fonts, the program is listed in Code 7.2 and Figure 7.2 is the schematic.  One really has to read Code 7.2 to fully understand what is doing what.

I find one omission quite frustrating.  The 3 Pin header with S 5 G is not explained or confirmed within the text.  As I recall [and I may be wrong], this is Signal, +5 volts, and Ground respectively.  

The relationship to the schematic is questionable as within it,  Pin One is an obvious Ground, Pin 3 is an obvious V+ input, and Pin 2 appears to be that Signal pin.  Nowhere within the text is there clear mention of the V+input requirement.  Might I suggest an Errata sheet be included with any further releases of this text?

 I presumed the Signal was an RS-232 RX, but now I am unsure. I believe there is a Parallax document that I haven't located and may explain further.

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