LEVEL7 Non-Maskable Interrupt Debugger Page 3
Rev. B02
LEVEL7 outputs at 19200 baud only. The peripheral attached to CPU port #0 must be set to 19200
baud or the debugger’s output will be unreadable.
***** Level 7 Interrupt Debugger *****
(activated by XXXXXX exception)
-------------------------------------------------------------
Primary Functions:
1) Exit Level 7 Handler 2) Show Stacked Registers
3) Examine/Modify Location 4) Show System Comm. Area
5) Display memory block
Extended Functions:
6) Display JCB information
7) Display TCB information
8) Display DDB information
9) Display memory modules
10) Display shared memory (SMEM)
11) 680x0 Disassembler
12) Identify an address
The primary functions listed are functions supported within LEVEL7 itself. Extended functions are the
overlays you have specified. In the example, a number of overlays have been loaded. Your extended
functions list may be different.
To return to the Main Menu from any function, press
CTRL
/C. To leave the debugger and release
operation of the system, select option 1 on the Main Menu. You may redisplay the Main Menu by
pressing
RETURN
.
The following sections describe each of the functions available on the menu.
Various areas within the primary and extended functions will request a memory address. You can
use an absolute address, or reference a stacked register or an offset from one. All addresses and
offsets must be entered in hexadecimal. For example, all of the following are valid responses:
1A4B20 @A5 1290(A0) @D5 4A(D3)
Exit Level 7 Handler
This option leaves the LEVEL7 debugger. If LEVEL7 was invoked via a button on the UPS port the
system will return to the state it was in before you pressed the button. If it was invoked via GOL7, the
system should continue running and the job executing GOL7 will return to the AMOS prompt. If
LEVEL7 was invoked via a trapped exception, AMOS will be given the exception for normal processing.
Usually this means the job generating the exception will be aborted in the usual manner.
Note there are cases where the system may crash or various interfaces will stop working when
you exit LEVEL7. This is caused by having the system interrupt locked for an extended period of
time while interrupt-generating hardware is still active. This is especially true of Ethernet
interfaces. Though this is a rare occurrence, it can happen.
Show Stacked Registers
This option displays the contents of all registers as they were the moment LEVEL7 was entered. It also
displays the stack frame which caused LEVEL7 to be entered.
(13 pages)
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