Wednesday, May 05, 1993
					09:53 PM PDT

This info is for those of you who are using the converted sources for
the MirageFreq 2.1 program.  The files included are:

	miragefreq.bas		main program in C=64 Basic
	getrate.asm		MIDI data handler in 6502 assembler
	moreinfo.txt		output from the moreinfo program

Here's a short bit on each file.

miragefreq.bas

This is converted from C=64 Basic to standard ascii.  The program should
be pretty readable in this form.  The only really strange stuff is the
translation of special characters that are used by the C=64 to do
various functions.  The special characters are replaced by a string of
characters enclosed in [] brackets.  The string is either a color, in
which case the character would change the text color to the name.  The
other special characters are:

	[C/DN]	Cursor down
	[C/UP]	Cursor up
	[C/LF]  Cursor left
	[C/RT]	Cursor right
	[RVON]	Start reverse text
	[RVOF]	End reverse text
	[SWLC]  Switch to lower case
	[SWUC]	Switch to upper case / graphics
	[CLR]	Clear screen
	[HOME]	Home the cursor
	[INS]	Insert one character
	[DEL]	Delete one character

Here's a quick layout of the functions by Basic line numbers.

1-50		Header comment, copyright and some startup
100-190		Initialization subroutine
200-290		Main loop including the screen print commands
300-395		Reads the input characters and executes commands
400-405		Screen header print routines
410-425		Routine to get pitch bend range
450-465		Routine to get the MIDI channel
500-550		Routine to interface to assembly code
600-699		Help routine
700-790		Calculates the internal filter frequency
800-850		Converts a frequency to a MIDI note and pitch bend
860-870		Sends an up or down command to the Mirage
900-990		Exit routine

That's pretty much it.


getrate.asm

This is assembly language for the C=64's 6502 processor.  This is in
basically the Merlin assembler format, converted to ascii.  Should be
pretty much self explanatory.  Merlin saves space by just putting one
space in front of operands and then displays them tabbed in on the
screen.  This tends to make the source look a bit strange.


moreinfo.txt

I ship out MirageFreq with a separate MOREINFO program that prints to
the screen and optionally to a printer additional information on using
MirageFreq and also a bit of a tutorial on sampling theory.  This is the
ascii converted text from that program.