David, at 08:21 on Feb 24 1996, you wrote to Bill Grimsley...

BG> atusr
BG> Copyright (c) 1988,89,90,91,92,93,94  by USRobotics Inc.
BG> All rights reserved.

DD> . . .[chomp]. . .

DD> ATUSR produces ERROR on the Courier.

Oh really?  Try some of these undocumented little gems then...

ATY4        - Line status progress (debug mode)
ATY5        - Part of the selftest (diodes)
ATY6        - Statistic same as ATI6
ATY7        - Analog stats (only during connection)
ATY9        - 255 unknown numbers (only during connection)
ATY14       - Configuration
ATY15       - Current DipSwitch settings
ATGx[A[,B]] - Set of I/O commands (A - address, B - byte)
   =        - memory dump (bytes)
   B        - I/O ports dump
   I        - in byte from port
   O        - out byte to port
   R        - memory dump (words)
   U        - ???
   W        - write byte to memory
   BOOT5    - reset modem firmware
   ?        - some more secret commands :)
ATUSR       - Credits
ATRS99?     - USR Copyright message (part of ATUSR)
AT!E (0,1)  - Turn on/off calling tone
ATI92       - Credits
ATI99       - The production date of the ROM
AT&Jn       - n=[0,1] Jack type? (only for DSP version < 10)
ATZn        - n=[0..5] software reset
ATNn        - Call DSP procedure number n
ATNL        - Move 10K to port [00C0] (DMA ?)
ATNX        - Boot start

Regards, Bill

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