USING THIS GUIDE
This guide is for those of you who have setup Concurrent DOS 8-16
using one of the XIOS files provided, and now wish to customize
certain parameters. Customizing should only be done if one of
the standard XIOS files does not meet all of the needs of your
system. You may also want to customize parameters in the loader
you have chosen for your system such as the baud rate of the
system console or the step rate of your floppy drives.
Note that customization of printer or terminal related
characteristics may require changes in the TTYS or LPRS files.
Refer to your "Concurrent DOS 8-16 Installation Guide" for
information on making changes to the TTYS or LPRS file.
TWO METHODS FOR CUSTOMIZATION
There are two methods for customizing your operating system.
Which one you use depends on the particular changes you want to
make.
The first method uses DDT86, the Digital Research dynamic
debugging tool. DDT86 allows you to interactively change, or
"patch", already assembled machine language programs. With
Concurrent DOS 8-16 you can use DDT86 to patch the XIOS and the
loader files supplied on the distribution diskettes.
The second method of customization involves editing certain
modules of source code provided by CompuPro on the distribution
diskettes. The edited modules are then assembled using RASM86,
and linked with already assembled code modules supplied by
Digital Research to produce a new XIOS file.
When customizing a XIOS file by DDT86 patch or the RASM86
assembler, you must then use GENCCPM to build that XIOS file into
a useable CCPM.SYS file. Customizing the loader only requires
DDT86 patching.
Both DDT86 and RASM86 are explained in more detail in the
"Programmer's Utility Guide" found in your Digital Research
Concurrent CP/M documentation. GENCCPM is explained in detail in
the "System Guide" from Digital Research.
XIOS FILES SUPPLIED WITH CONCURRENT DOS 8-16
XIOS stands for extended Input/Output System. The XIOS is a code
module that handles the physical interface to Concurrent CP/M and
can be modified to handle a variety of specific needs. CompuPro
supplies an assortment of assembled XIOS files set up for various
different hardware configurations. In addition, CompuPro
supplies the source for certain key parts of the XIOS for
reassembly and customization. (These files are explained in the
section Editing and Reassembling the XIOS.)
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