ATTN mode pauses the program and allows other steps to be taken. Enter ATTN mode by typing CNTRL A from within a running program. When BR is in ATTN mode, the line number field on the bottom row contains the number of the program line to be executed next.
Other commands and immediate mode statements, including the STOP (St) and END (En) statements, may be executed from ATTN mode. The use of many debugging features -such as the LIST command, PRINT statements, editing of programming lines, STEP or TRACE modes and changing values of variables -are supported in ATTN mode. Entering GO will return the program to RUN mode.