TS440S.49
These next tests check the outputs of the 8255 parallel port interfaces,
which select several internal functions.

    37          (IC2) port A all lines high and beep
    38          (IC2) port A all lines low
    39          (IC2) port B all lines high
    40          (IC2) port B all lines low
    41          (IC2) port C0-C3 high, C4-C7 low, M.SCR 1MHz and F.LOCK ON
    42          (IC2) port C0-C3 low, C4-C7 high
    43          (IC53) port C all lines high
    44          (IC53) port C all lines low

The following tests display busy and scan line status using the rightmost eight
digits of the display.  You will push buttons to cause the digit to change from
a 1 to a 0 indicating that the associated button has been pushed.  AT (ATUNE)
also requires AUTO.  Any TX means PTT, SEND, AT or VOX ON with sound.

 test    posn8    posn7    posn6    posn5    posn4    posn3    posn2    posn1
 ----    -----    -----    -----    -----    -----    -----    -----    -----
  45     LOCK              AT       Mic UP   Mic DN   Any TX            VS1
  46 audible "SIMPLEX" no button
  47 (key scanner)
  48     1        6        V/M                        VOICE
  49     2        7        M>V      RIT      A/B
  50     3        8        SCAN     XIT      SPLIT
  51     4        9        M.IN     T-Fset   A=B      dip3     dip4     dip5
  52     5        0        CLEAR    1MHz     dip1     dip2     dip6     dip7
  53                       ENTER    DOWN     UP       dip8     dip9     dip10

The digits 0-9 are on the front panel keyboard.  Dip2-dip10 are the
segments of S50, the SSB frequency response dipswitch of the
control unit printed circuit board. Changing not recommended.

   54   not used
   55   not used
   56   END