user manual

Entering and Debugging Programs
B-35
B
Entering and Debugging Programs
There are various ways to enter a user program into system
memory for execution. One way is to create the program using the
Memory Modify (MM) command with the
assembler/disassembler
option. You enter the program one source line at a time. After each
source line is entered, it is assembled and the object code loads into
memory. Refer to the Debugging Package for Motorola 68K CISC CPUs
User's Manual for complete details of the 177Bug Assembler /
Disassembler.
Another way to enter a program is to download an object file from
a host system. The program must be in S-record format (described
in the Debugging Package for Motorola 68K CISC CPUs User's Manual)
and may have been assembled or compiled on the host system.
Alternately, the program may have been previously created using
the 177Bug MM command as outlined above and stored to the host
using the Dump (DU) command. A communication link must exist
between the host system and the MVME177 port 1. (Hardware
configuration details are in the section on Installation and Start-Up in
Chapter 3.) The file is downloaded from the host to MVME177
memory by the Load (LO) command.
Another way is by reading in the program from disk, using one of
the following disk commands:
❏ BO
❏ BH
❏ IOP
Once the object code has been loaded into memory, you can:
❏ Set breakpoints
❏ Run the code
❏ Trace through the code