added cautionary verbiage to source code

branches/dwg/Apps/crossdev/2DRIVE.C

@@ -4,6 +4,42 @@
    it contains techniques which are not recommended because
    there are better API functions to do these operations.       */
 
+/*
+	This code is in the crossdev folder because it is part of
+	my development environment, and I said I would make everything
+	available.
+	
+	The purpose of this code is to dynamically alter the BIOS
+	data associated with PPIDE (or PPISD) drives. The default
+	configuration is that mass storage devices get four drives.
+	
+	Each of the four drives can be remapped using the logical 
+	unit utility MAP.
+	
+	The purpose of this code is to alter the runtime data so that
+	instead of the PPIDE having four drives for the primary IDE
+	device, it then has two for the primary and two for the secondary.
+	
+	The MAP command will properly display the status after this is
+	run, but you must keep in mind that having two sets of logical
+	units at the same time is twice as complicated to keep straight
+	in your mind, and you have to be more careful you know exactly
+	how the drives are mapped so you don't accidentally destroy your
+	data.
+	
+	This utility is unsupported, and not recommended for general use.
+	The reason this utility wasn't generally published is that it
+	is very difficult to give support about this remotely.
+	
+	If you are brave, and talented, and you can figure out what I did
+	with pointers in this program, then you get the prize, which is
+	to be able to copy from one CF chip to another in a dual adapter.
+	
+	It has only been tested on my PPIDE, and I don't know what will 
+	happen if you try it. You could wipe out your CF chip, so make
+	sure you are backed up if you try this.
+*/
+
 
 #include "cpmbios.h"
 #include "bioscall.h"
@@ -51,18 +87,20 @@ main(argc,argv)
 	iregbc = DRIVED;
 	iregde = 0;
 	bioscall();
+
 	pDPH_D = ireghl;
 	pDPB_D = pDPH_D->dpb;
 	pDU_D  = ireghl -1;
 	*pDU_D = 0x41;
 	printf("Current D: DevUnit        is %02x\n",*pDU_D);
+
 	pCUR_D = ireghl + 18;
 	*pCUR_D = 1;
 	printf("Current D: Logical Unit   is %d\n",* pCUR_D);
+
 	pNUM_D = ireghl + 20;
 	*pNUM_D = 64/9;
 	printf("Current D: Number of LU's is %d\n",* pNUM_D);
 		
 
 }
-