[CW] Ascii/Morse keyboard ??

[Skip Doane]

 I just purchased a KSN Inc. Model CG-300 Message Master Keying unit,It has no instruction manual,I can get it to act as a CW practice sender (works great)
but i have no idea what the other controls and interface connectors are used for .
 Is anyone familar with this unit,or has any idea where i can get a manual ??
 I tried the internet with no results.

 I hope that someone can help me find some INFO about this keyboard..

73s de Skip K1TXU
Fist-1958