VARIOUS NOTES ABOUT C25SIM01.ZIP

This is the first time I've released this code under the GNU license. When
I can, I want to do some fixes and improvements, so I'm naming this version
C25SIM01.ZIP.

1. There is a list of four bugs that I don't have in front of me at the
moment. As best I remember, they are:

	A. The BIOZ instruction branches on the wrong sense of the BIO
	signal.

	B. In C25LIB.C, c25_reset() does some things it shouldn't do,
	and fails to do some things it should.

	C. My memory on this is foggy. Apparently there are three bits
	in an instruction when you do indirect addressing, which specify
	what register the instruction should use, and the C25LIB routines
	always read those bits as 101, rather than selecting different
	registers.

	D. ???

2. All of this code was originally written for DOS, and it has a number of
non-portable DOS idioms that would not translate gracefully to Unix or
Linux. Here are the ones I can think of right off the top of my head:

	A. With DOS, you can use kbhit() and getch() to respectively
	determine whether a key was pressed, and to get the key.

	B. The windowing functions make assumptions that are valid for
	EGA and VGA graphics hardware, about where in memory to find the
	text buffer. This is done in order to quickly switch between
	windows for the simulator, the help screen, and the source code.
	If you were running in X Windows, there would be no need for this
	to be handled by C25SIM.

	C. C25LIB.C assumes that an "int" is 16 bits and a "long" is 32
	bits. This is true for the Microsoft and Borland C compilers that
	I was using at the time. I don't know if the code would break if
	ints became 32 bits, as I believe they are under GCC.

3. As time permits, I will check into all of this stuff, fix the bugs, and
make the code compile graciously under both DOS and Linux.