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@BEGIN_FILE_ID.DIZUsr Courier Undocumented commands!
@END_FILE_ID.DIZ
USRobotics Courier V.34: Undocumented Features

----------------------------------------------



AT Commands

-----------



^BE^GHmX^I^H    (where ^ indicates a control character)

                enter flash rom programming mode



                h = hex digit, n = decimal digit, [] = optional



G=[hhhh:]hhhh   display a byte dump of the modem memory

GR[hhhh:]hhhh   display a word dump of the modem memory

GIhhhh          read value from I/O port

GOhhhh,hh       write value to I/O port

GBhhhh          dump 256 sequential I/O ports

GN              (unknown, set flag)

GXhhhh          (unknown)

GYhhhh          (unknown)



RS99?           display copyright notice

USR             display copyright notice and credits



Yn

      n =  5:   self test

      n =  6:   (unknown, gives OK)

      n =  7:   while online: signal quality screen

      n =  8:   (unknown, displays lots of cryptic data)

      n =  9:   (unknown, displays lots of cryptic data)

      n = 10:   (unknown, not implemented?)

      n = 11:   while online: display frequency level 

      n = 12:   while online: display recv / xmit level (?)

      n = 13:   (unknown)

      n = 14:   (unknown; displays six bytes, final one is country code)

      n = 15:   display dipswitch settings

      n = 55:   (unknown)



&J              (unknown; works only in a specific, unknown mode of

                operation)



~S?             display the 16-place serial number of the modem



~S-ddmmyy-nnnnnnccnnnnnnnn

                save a new serial number to NVRAM

                ddmmyy  supervisor date

                  n       a digit

                  c       any character



S registers

-----------



Saved to NVRAM:



S31             (unknown)

S35             (unknown)

S36             (unknown)

S37             (unknown)

S39             (unknown)



S40             (unknown)

        .1      Germany: disable ATA

        .2      Germany:   blocking



S57             (unknown)

        .0      Germany: disable blacklisting



Volatile:



S17             (unknown, only written to)

S20             (unknown)

S30             (unknown)

S50             (unknown, only written to)





General AT Parser Idiosyncracies

--------------------------------



- If not between Sn and = or ?, .n will be ignored.





Country Codes:

--------------



        0 = USA/Canada          10 = New Zealand

        1 = Japan               11 = Czechoslovakia

        2 = Finland             12 = Belgium

        3 = Sweden              13 = Denmark

        4 = UK                  14 = Australia

        5 = Norway              15 = France

        6 = Switzerland         16 = Germany

        7 = Netherlands         17 = International

        8 = South Africa        18 = Austria

        9 = Italy               19 = Ireland



The country code, as all the Y14 bytes, is saved to NVRAM. There is a

Cx=n command to modify those bytes, unfortunately this command is disabled.

   
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