1660CD.TXT

      1660 CARRIER DETECT MOD.
      PICTORIAL BY RON GATCHEL
             12/29/85
 
MODIFICATION OF 1660 MODEM TO PROVIDE
CARRIER DETECT SIGNAL BACK
INTO COMPUTER.  CARRIER CAN THEN BE DETECTED
BY TERMINAL PROGRAM AS FOLLOWS:
 
IF(PEEK(56577)AND16)=0THEN [CARRIER IS
PRESENT]
 
THIS MOD HAS BEEN USED WITH
COMM-TERM 7.0, WITH GREAT SUCCESS!
 
NOTE THAT YOU WILL STILL NEED TO SWITCH
MODEM TO ANSWER MODE WHEN ALTERNATING
HI-LO TONES ARE HEARD IN SPEAKER (E.G.
WHEN CALLING A WESTRIDGE MODEM).
 
 
    6777777777777777777777777777777775
    6 O     BACK (FOIL) SIDE       O 5
 6777       OF 1660 MODEM            5
 6 AO O1                             5
 6 BO O2    NOTE THAT PINS G         5
 6 CO O3    AND I DO NOT EXIST       5
 6 DO O4    IN CONNECTOR AT LEFT.    5
 6 EO O5    PIN 9 IS NOT SHOWN FOR   5
 6 FO O6    CLARITY.                 5
 6 HO O7                            5
 6 JO O8   JUMPER WIRE               5
 6 KO------------------.             5
 6 LO O10            1 3      10     5
 6 MO O11            OOOOOOOOOO      5
 6 NO O12               IC1          5
 6///                OOOOOOOOOO      5
     5O             20        11   O 5
     77777777777777777777777777777777
NOTE:  PRY
MODEM CASE APART CAREFULLY
       WITH LARGE SCREWDRIVER.
       USE LOW WATTAGE IRON AND SMALL
       WIRE.  BE CAREFUL NOT TO LEAVE
       A SOLDER BRIDGE BETWEEN PIN 3 OF
       IC1 AND THE SURROUNDING FOIL.