Creating MDOS library for tms9900-gcc
Include files:
- key_mdos.h - key scan routines.
- video_mdos.h - all the routines in the video system.
- memory_mdos.h - page and memory allocation calls.
- utils_mdos.h - sound and other calls.
- math_mdos.h - floating point math routines.
- dsr_mdos.h - file access routines.