** File: [VTPROM]00README.TXT

** Roadmap to the VTPROM Directory:

        GREEK*.*  -     Hack program to download greek font to VT200's.

	VTPROM.*  -	Program to dis-assemble/re-assemble PROM bitmaps
			for VT100 class terminals.  Can also be used to
                        make proms for CITOH video terminals.

	*.BIT     -	A bitmap listing of a PROM produced by VTPROM.
	*.HEX     -	Assembled HEX code output by VTPROM program 
			for downloading to prom programmer.
	*.LST     -	Listing of a PROM obtained from prom programmer.
	*.HLP     -	VT100 help file which displays alternate characters.
	*.TBL     -	LASER Printer file: Character Translation Table.
	*.TAG     -	LASER Printer file: TAGs to glue on completed PROMs.
	*.LBL     -	LASER Printer file: Labels to glue onto terminals.


** Procedure:	Create an alternate character set PROM for a VT100.
		Use a 5V-only 16K EPROM.

	   1).  Create a *.BIT file containing 7 column by 9 row
		bitmaps of the characters you want in the PROM.
		See MATHONE.BIT for an example of the format of this file.

	   2).	Use the VTPROM program in mode 2 to create a file which
		can be downloaded into the prom programmer to write the
		new PROM.

** Procedure:	Modify an existing (unknown format) character set
		PROM or create a new character set for another
		non-VT100 terminal.

	   1).  Get a listing of the contents of the PROM and put it in
		some file in a format similar to one of the *.LST files.

	   2).	Run it through the VTPROM program in mode 1 to dis-assemble
		it into a bitmap and figure out how the characters are stored.

	   3).  Use the *.BIT file to create a new *.BIT file containing
		the bitmaps of the characters you want in the PROM.
		See MATHONE.BIT for an example of the format of this file.

	   4).	Make a new copy of the VTPROM program and edit the
		output routine to write a PROM in the format required
		for the terminal.

	   5).	Use the VTPROM program in mode 2 to create a file which
		can be downloaded into the prom programmer to write the
		new PROM.

	   6).  NOTE: the *.BIT file must be edited between step (2) and (5).

Installing the new PROM in VT100's and VT102's:

	On VT-102's the PROM is plugged into the empty socket in the
	lower left corner of the main PC board.

	On VT-100's the PROM is plugged into the only empty socket
	which is located in in the lower left corner of the main PC
	board.  On some models you may have to tie the programming
	pin of the PROM up to +5V if the alternate characters flicker
	on the screen.