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+             D   I   G   I   T   A   L      R   E   S   E   A   R   C   H
+     
+                P. O. Box 579, Pacific Grove, CA 93950, (408) 649-3896
+     
+     
+                                *** MP/M 1.0 ***
+     
+                              Application Note #01
+     
+     
+                  Integrating a custom LDRBIOS into MPMLDR.COM
+                  --------------------------------------------
+     
+     
+           The MP/M 1.0 loader resides in a file named MPMLDR.COM.  This
+       loader contains a BIOS called the LDRBIOS org'd at 1700H.  MP/M is
+       distributed with an MPMLDR.COM that is configured for a four drive
+       single density or mixed double/single Intel MDS-800.  This MPMLDR.COM
+       can be configured for a different hardware environment by coding
+       a LDRBIOS as described in section 3.1 of the "MP/M User's Guide".
+     
+           The following steps can be used to integrate a custom LDRBIOS
+       into the MPMLDR.COM:
+     
+           1.)  Obtain access to CP/M version 1.4 or 2.0 and prepare the
+       LDRBIOS.HEX file.
+     
+           2.)  Read the MPMLDR.COM file into memory using either DDT
+       or SID.
+     
+               A>DDT MPMLDR.COM
+               DDT VERS 2.0
+               NEXT  PC
+               1A00 0100
+     
+           3.)  Using the input command ('I') specify that the LDRBIOS.HEX
+       file is to be read in and then read ('R') in the file.  The effect
+       of this operation is to overlay the BIOS portion of the MP/M
+       loader.
+     
+               -ILDRBIOS.HEX
+               -R
+               NEXT  PC
+               1A00 0000
+     
+           4.)  Return to the CP/M console command processor (CCP) by
+       executing a jump to location zero.
+     
+               -G0
+     
+           5.)  Write the updated memory image onto a disk file using
+       the CP/M 'SAVE' command.  The 'X' placed in front of the file
+       name is used simply to designate an experimental version, preserving
+       the orginal.
+     
+               A>SAVE 26 XMPMLDR.COM
+     
+           6.)  Test XMPMLDR.COM and then rename it to MPMLDR.COM.
+