NOTE: This is temporary, to be replaced by a real diagram soon.

 
 CABLE FOR "Flip phone" 550 series (micro-tac portable)
 
 A = PRN PORT DB25 CONNECTOR
 B = "FLIP PHONE JACK"
 
 A.1 to B.4
 A.2 to diode (band towards A conn.) other side of diode to TEST LEAD
  The TEST LEAD connects to the center pin of the Battery Connection Area
 A.4 to diode (band towards A conn.) other side of diode to B.1
 A.12 to B.5
 A.13 to B.6
 A.18 to B.8
 
 also tie pins 18 thru 25 on conn. "A" together (for grounding)
 
 Pin 8 on "B" connector to - (ground) of 8 Volt power supply
 Pin 7 on "B" connector to + (positive) of the 8 Volt supply
 
 * NOTE *
 THIS PHONE TYPE REQUIRES 8.0 VOLTS TO PROGRAM