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 167Bug 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 MVME167 port 1. (Hardware configuration details are provided in Connecting Peripherals on page 3-19.) The file is downloaded from the host to MVME167 memory by the Load (LO) command.
Read the Program from Disk
Another way to enter a program is by reading the program from disk, using one of the disk commands (BO, BH, IOP). Once the object code has been loaded into memory, you can set breakpoints if desired and run the code or trace through it.A convenient way of doing character input/output and many other useful operations has been provided so that you do not have to write these routines into the target code. You can access various 167Bug routines via one of the MC68040 TRAP instructions, using vector #15. Refer to the Debugging Package for Motorola 68K CISC CPUs User's Manual for details on the various TRAP #15 utilities available and how to invoke them from within a user program.
Preserving the Debugger Operating Environment
This section explains how to avoid contaminating the operating environment of the debugger.
Topics covered include:
❏ 167Bug Vector Table and workspace
❏ Hardware functions
❏ Exception vectors used by 167Bug
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