AT&T IPC-1600 User Manual page 45

The following screen display shows how to remove only IPC-1600 driver
and configuration software files from the system disk. The IPC16DIA
diagnostic program remains on the system disk.
C:\ $ d e l i p c \ i p c 1 6 d o s . s y s
C:\ $ d e l i p c \ i p c 1 6 c o n f . e x e
C : \ $
After editing the CONFIG.SYS file,
reboot the system to reconfigure the system.
Removing the MS-DOS Device Driver
MS-DOS DEVICE DRIVER INSTALLATION 2-17