Radio Shack TRS-80 Model II Reference Manual page 132

MODEL II TRSDOS
Details of the Menu
M Display Menu
After you have entered several menu commands, the menu begins scrolling
off the display. Use the M command to clear the display and redisplay the
menu.
S Perform System Command
Whenever you need to perform a TRSDOS library command, use this
command as shown previously. After execution of a TRSDOS library
command, control will return to TERMINAL's menu.
Some TRSDOS commands and programs always return to TRSDOS READY. Refer to
pages 2/4 and 3/3 for lists. If you execute any of these via the S command, control
will not be returned to TERMINAL, but to TRSDOS READY.
B Set/Change Break Character or Sequence
This command lets you select which incoming code will be interpreted as a
"break". It also lets you define a key to send that same break character or to send a
break sequence.
For the break character, any code from 0 to 255 may be specified. For the break
sequence, any duration from I to 451 milliseconds may be specified. (The correct
time period duration for a break sequence is determined by the host program, and
depends on the baud rate.) For the user-defined break key, any key except
(BREAKl
or
(CTRLlm
may be used.
When TERMINAL receives the specified break character (or whenever it receives a
break sequence), it will warn you so you may take appropriate action. If it is in the
transmit from RAM mode, it will pause the transmission until the next character is
received.
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