Service manual

Page 4 LEVEL7 Non-Maskable Interrupt Debugger
Rev. B02
Examine/Modify Location
This option lets you read or write a single memory location. After you select this option you will be
asked for the address, then for the size of the read/write to perform. This sequence will repeat endlessly.
Press
CTRL
/C to return to the Main Menu.
Show System Comm. Area
This option displays the system communication area at 0x400, one page at a time. Press
CTRL
/C if you
want to abort the listing prior to the end.
Display Memory Block
This option displays a selected area of memory. Several formats are available; when you select this
option you are asked for the format you want, then for the starting address to display. LEVEL7 will
display one page of information. You may then press
RETURN
to display the next sequential area or enter
a new address. This continues until you press
CTRL
/C to return to the Main Menu.
Display JCB Information
This option displays information about a selected job. LEVEL7 asks what job selection method you
want to use. The by number selection allows you to select by position in the job table. This is handy for
scanning job by job. The RunQ List selection displays the active jobs in run queue order.
After you pick the selection method, LEVEL7 asks what job you want to display. It displays the selected
job information and asks for another job. When you’re done, press
CTRL
/C to return to the Main Menu.
The displayed registers are for the job when running. If this job is the one referenced by JOBCUR,
then they will match the stacked registers. If this job is not referenced by JOBCUR, the registers
are from the user’s system stack area in memory.
Display TCB Information
This option displays information about a selected terminal. As with the JCB function, LEVEL7 asks
what selection method you want, then for the terminal. It displays the information for the selected
terminal, then lets you specify another. Press
CTRL
/C to return to the Main Menu.
Display DDB Information
This option displays information about dataset driver blocks which are used to access devices and files.
LEVEL7 asks for the address of the DDB to display. It displays the address you select as a DDB and
asks for another. Press
CTRL
/C to exit to the Main Menu.