;
;	TERMINAL PROGRAM	---- Version 2.1a
;
;	1.0	Program began, May 11th 1989.
;		The aim of this program is to provide a replacement terminal
;		mode to the one supplied in the terminal rom, by Amsoft.
;		It is intended to be a RSX, in a similar manner to the Amsoft
;		ones, but called |TERM. The user will be allowed to turn on
;		and off things like Remote and Local Echo, and to mask out
;		certain unwanted characters, and the BEL character.
;		It is hoped just to provide a much easier terminal program to
;		work with, and also allow me to learn some assembly language
;		programming.
;		At this stage all the options are set up at the time of
;		assembly.  The program can handle expanding function key
;		macros, which is something that is sorely lacking from the
;		Amsoft terminal mode.
;		The present revision has no RSXs yet, as they make testing
;		the code harder. Some defaults are set up by the terminal
;		program as it is entered, and it also prints up a message
;		announcing itself, and its writer.
;		The options supported are-
;			BELL FILTERING, LOCAL ECHO, REMOTE ECHO,
;			COMPUTER PHONE (mask top bit),
;			DELETE TRANSLATION (translate 127 to 8),
;			ADD LF TO CR (send a LF out after every CR).
;
;	1.1	Run time options have been added. This is done by using
;		register C to hold a bit dependant list of options.
;		Register C is set up at the start of the run from a status
;		byte, and is then tested in the appropriate places with the
;		BIT command. This makes changing the configuration much faster.
;
;	1.2	Added in RSX's properly. |TERM for terminal mode, and |INIT
;		to set up the configuration byte, by asking questions of the
;		user.  Y,y,N,n are accecpted.  Return leaves the option the
;		same.
;
;	1.3a	Added in proper mainline code, so that subroutines are 
;		jumped to for doing things like reading in keys, and reading
;		from the modem.  This makes the code a little easier to follow.
;
;	1.3b	Made the filter for characters going to the screen much faster
;		by automatically letting through everything that is 32 or 
;		above, instead of making them sit through the whole cycle.
;
;	1.3c	Added in |STATUS to allow the user to check the current
;		configuration.  Added in direct writing of the source
;		to a binary file, to make saving it much easier.
;		Added to more run-time options - Destructive delete (8 32 8)
;		when just (8) is sent. And a tab expander, that expands to
;		the nearest column that is a multiple of 8.
;
;	1.3d	Added in direct key test for ESC (66) so that an escape
;		can be guarenteed, even if the next character cannot be
;		sent (thus is not read).
;
;	1.3e	Made the system expand the macros, by calling KM_READ_CHAR
;		instead of KM_READ_KEY which makes the programming simpler.
;		
;	1.4a	Minor tidy ups in source code. Partial fix for the ESC problem
;		caused by BASIC. Change of STATUS name to STATS, to avoid the
;		problem with name conflict with UTOPIA. Abandon from INIT
;		added to allow fast escape.
;
;	1.4b	More minor bugs tackled.  ESC is redefined to allow the user
;		to press just ESC to send CHR(27) and to press CONTROL/SHIFT
;		ESC to leave the program.   Macros expanded by the program now
;		to allow masking out the ones that aren't wanted.
;		Direct call to |CDUMP added.
;
;	2.0a	Major re-write.  Totally rewritten for speed, to allow
;		the use of 2400 modems. Added Word Wrap.
;
;	2.0b	Minor rewrite -- made it a little faster in places.
;
;	2.0c	Jumpblocks removed for non-altering conditions.
;		Buffering added.
;		Connect/Carrier Lost messages added
;		Clear screen routine improved.
;
;	2.0d	Ansi support, interupt driven buffering (Sio input)
;		CONNECT/NO CARRIER messages remove - intelligent modem.
;
;	2.0e	Jumpblocks rewritten, so faster. Buffering of modem output.
;		Subroutine added to tell user when buffer is ready for more
;		input if the user is intersted.
;
;	2.1a	Screen output re-written to include Ansi graphics characters
;		in a much faster layout. Added *MUCH* faster serial access.
;		IBM lower characters included. Colour tracing added (hopefully
;		working now).  Altered return data from buffering.
;
;	2.2a	Direct screen writes added, for speed.  Screen restricted to
;		24x80 size, using software scrolling.  Added in a screening
;		buffer as well as the translation one.  Lots of work done on
;		Ansi stuff.
;
;	2.2b	Changed translation buffers back to the original setup --
;		it works just as well, and takes 512 bytes less space.
;		Fixed bug with ESC [ K - didn't clear shadow screen.
;		Fixed bug with ESC [ J - corrupted character set sometimes.
;		Fixed bug with ESC [ H - didn't eliminate zeros, causing
;		some really weird problems!
;		Removed the last of the reliance on Amstrad control characters.
;		Added in support for CSI (&9B).
;		Changed code for ESC [ K so that it produces underline on
;		screen when necessary.
;		Changed code that produces the underline on screen.
;		Removed the silly RMEMs which saved over 1K of zeros into
;		into the file - the in and out buffers don't need to
;		be preinitialised.