Often with MICRO-C, you have two or more systems configurations that you wish to use on a regular basis. For example, you might want to compile for testing in RAM under a debug monitor, and then compile directory for ROM.

Beginning with version 3.14, MICRO-C's CC(xx) and SLINK commands support an S=option which allows you to override the startup file used in the library. For most multiple configuration requirements, simply providing a new startup file for each configuration will solve the problem. See the Micro-C Technical Manual for details on setting this up. If you have MICRO-C version 3.13 or earlier, or have special custom configuration requirements which cannot be solved with a simple startup file change, read on...

If you are like most programmers, you will do most of your compiling for testing under a debug monitor, and only infrequently will you want to generate the final code for ROM. If this is the case, you can simply configure your library (See READ.ME in library subdirectory) for the memory addresses used in the debug version. When you wish to create a ROM version, compile the program with the '-x' option (to create a full assembly listing file), edit the .ASM file to change the addresses to the ROM system, and assemble the file manually:

CC11 myprog ; Compile for debugging

CC11 myprog -x ; Compile to assembly
edt myprog.asm ; Edit to change memory addresses
asm11 myprog ; Assemble to ROM image

If you frequently compile for different system configurations, the above approach can become quite tedious. In this case, edit the library startup files to use EQU's for all memory addresses, and then place those EQU's in a separate startup file, which is defined at the TOP of the SLINK external index file (Note that you can have multiple startup files):

<SYSTEM.ASM ; System memory equates and code ORG
<6811RLP.ASM ; Remainder of startup file
...

All you have to do now, is change the file SYSTEM.ASM. This can be accomplished with a simple batch file to copy one of several "canned" system EQU files:

mcconfig.bat:
@echo OFF ; DOS 3.3 and later only!
copy \MC\LIB11\%1.ASM \MC\LIB11\SYSTEM.ASM ; Copy in configuration

debug.asm:
?RAM EQU $2000 ; Data RAM start address
?RAMEND EQU $7FFF ; Data RAM end address
ORG $0100 ; Origin code in RAM

rom.asm:
?RAM EQU $0000 ; Data RAM start address
?RAMEND EQU $7FFF ; Data RAM end address
ORG $E000 ; Origin code in ROM

Now, you can switch to the canned configurations with:

C:\MC> mcconfig debug ; Select DEBUG configuration
C:\MC> mcconfig rom ; Select ROM configuration

Using the above technique, you can have as many setup configurations as you wish, each one stored in a small file. A variation of the system can be used to replace the entire startup files (or any other portion of the library) if your system configuration differences