MONO-SKETCH and COLOR-SKETCH for ANSI serial terminals

Drawing programs for VTL-02C by Dave Hassler, Sept., 2023.
Color routine adapted from Nils Andreas (The Webdoktor).
Tidied up for 6800 VTL-2 by Dave Hassler.

This program is specifically written to take advantage of the IBM 850 character set in a serial terminal emulator; to wit, Minicom, provided in almost all Linux distributions at the time of writing.  Provision is made for running the program with a more basic character set (e.g., ISO 8859-1) - see comments at line 2000 in the program.

The program should run on any VTL-02 installation that has at least 2.5K free for a user program.

While instructions are provided in-program and use should be straight-forward, below is a "section description" of the program, plus a variable list.

LINES	   DESCRIPTION
2-7	   Print instructions, set initial position
10-60	   Print HOME$, clear area, accept command, branch
70-84	   Move cursor, output character (P)
100-945	   Movement sections
1000-1010  Clear screen
1020-1030  HOME cursor
1200-1210  Clear screen and reset initial cursor pos.
1300-1376  *** COLOR VERSION ONLY
	       After 'C' trap, change color
1400-1465  Determine pen size/density
1600-1665  Instructions/Menu
2000-	   Credits, options

VARIABLES
C	Color input* (if using ANSI color version)
I	Input variable
P	Density of 'pen': 1=full, 5=none
X	X position of cursor
Y	Y position of cursor
Z	Dummy input variable

"It ain't rocket science!" -- dhh   Have fun!

