The System Manual of SOL-20 - History of Computers

I. INTRODUCTION (cont.)
With a Sol, or CUTER on a Processor Technology GPM board, a poweron
performs a reset which causes a SOLOS system reset. The Sol
user may initiate this system reset anytime by simultaneously
pressing the upper case and repeat keys.
A SOLOS system reset enters SOLOS into COMMAND mode. When in COMMAND
mode, SOLOS will do a Carriage Return-Line Feed (CRLF) followed by a
prompt (>). SOLOS then awaits the entry of a COMMAND. A COMMAND is
processed upon receipt of a Carriage Return (CR). Pressing the MODE
(or Control-@) key while awaiting a COMMAND causes the current COMMAND
input line to be ignored and return to COMMAND mode. CUTER also
resets the current I/O pseudo port selections to the system default.
The MODE (or Control-@) key is also used to abort the execution of
most commands. This use of the MODE (or Control-@) key turns off
both tape machines (if on) and returns to COMMAND mode.
3