How to build the QD/CMD from QD/BAS using the Microsoft BASIC Compiler

1.	Convert tokenized BASIC into flat ASCII.
	(The source code on the web site is flat ASCII, despite being named
	 QD/BAS, so this step will not be necessary if you use that file.)

	(From TRSDOS 6/LS-DOS 6)
	BASIC
	load "qd/bas"
	save "qd/asc",A
	system

2.	Compile flat ASCII source code, generating /REL file.

	(From TRSDOS 6/LS-DOS 6)
	BASCOM
	* qd/rel:<d>=qd/asc:<d>-E-O

	where <d> is the drive number.
	The -O option causes L80 to generate a self-supporting executable
	instead of requiring external runtime libraries.

3.	Link the executable.

	(From TRSDOS 6/LS-DOS 6)
	L80
	* qd/cmd:<d>-N,qd/rel:<d>-E

	where <d> is the drive number.


BASCOM, L80 and associated executables were part of Model 4 BASIC Compiler,
Radio Shack Catalog number 26-2218.


Notice:	For some unexplained reason, one of the modules that Microsoft
	compiler BASIC loads into the compiled program feels the need to
	reprogram the video controller when the compiled program starts.
	There is absolutely no need for this, and this bug was not noticed
	when Model 4 Compiler BASIC was accepted from Microsoft in the early
	1980s.  The problem is that the values that are programmed into the
	video controller are incorrect, slightly different than what TRSDOS 6
	and LS-DOS 6 use and what is correct for the factory hardware
	adjustments of the Model 4, 4D and 4P systems.   Why Microsoft felt
	the need to have BASIC take over this operating system activity will
	likely remain a mystery.  

	Because of the bad values being loaded, it is possible that the video
	image may noticibly shift or become unstable (wavy or jittery) if you
	compile and then run your own version.  The reprogramming occurs when
	the compiled program begins running. 

	Because of this bug in the Microsoft libraries, the compiled version
	provided on the web site contains a BASIC runtime version that has
	been patched to cause BASIC to load correct values, although the
	loading is still not necessary.  The screen may still blink for an
	instant, but should remain stable.  

	Note also that if QD is compiled without the -O option (require the
	presence of BASRUN/CMD at runtime), the video reprogramming does not
	appear to occur.

	If you wish to patch your copy of the BASIC compiler, use FED.
	Locate the following bytes	62 50 55 08 19 64 18 18 00 09 00 00
	and replace them with:		63 50 55 0a 19 04 18 18 00 09 65 09
	This string appears in more than one of the files distributed with
	Compiler BASIC.

	This patch is provided without warranty and is meant only for the
	Model 4 version of BASCOM.