Retro1.org codex

RESET                                                    CP Privilege Class:  G

Use the RESET command to clear all pending interrupts from the specified
virtual device.  The format of the RESET command is:
+----------+------------------------------------------------------------------+
| RESET    | vaddr                                                            |
+----------+------------------------------------------------------------------+
where:

vaddr    is a virtual device address (cuu) of the device to be reset.


Usage note:

In addition to clearing all pending interrupts, all error conditions occurring
as a result of unit checks and virtual sense bytes are reset.

Response:

DEVICE RESET
   is the response you receive upon the successful completion of the command.