Here's a keyer and how we number the switches:

(original not numbered picture is here)

septambi.asm DOS file septambic keyer pic source code (e.g. has a control M at end of every line). Use this version if you're using virus95, virus98, virusNT, virus2000, or virusME. Be sure to rename it to "septambi.asm".

septambi.gz compressed septambic keyer pic source code

• Intelligent Image Processing (a textbook on wearable computing, personal cybernetics, etc., that includes information on keyers, etc...).
• about.eyetap.org/tech/keyers.shtml