4 Fbvnc is a small linux framebuffer vnc viewer. It is a clone of Milan
10 README file for vt52 vnc viewer, (c) 1999 Milan Pikula
14 2. Installation & running
20 vt52vnc is a VNC ( http://www.uk.research.att.com/vnc ) viewer,
21 which can be used on old, green, monochromatic, prehistoric terminals
22 labeled vdt52s, which are capable of vector graphics. The software is
23 functional, but incomplete: it does not support compression,
24 passwords and there are many ways to optimize the output.
28 This software is distributed under the terms of GNU GPL license, see
31 2. Installation & running
33 1) edit Makefile to adjust some parameters,
37 3) optionally install:
38 cp vt52vnc /usr/local/bin
44 As vdt52s does not have the mouse or any other pointing device,
45 one of three unlabeled buttons near the numeric keypad have been used to
46 act as mouse-lock. When you depress it, you can use the numeric keypad to
47 move the mouse, and `+', `-', `.', `enter', `0', and `5' as button
48 1,2,3 toggle and button 1,2,3 click.
52 Based on my own experiences, I recommend the speeds 38400 and
53 higher for "real work". The screen is drawn by rectangles. This is done
54 to improve the reaction times, when the screen changes very often.
56 The software uses the XOR mode to actually draw the image,
57 which can be improved using AND and OR mode in some cases. One can
58 also imagine another optimizations for particular shapes. I will not
59 add those optimizations, as the decisions are very memory-consumptive
60 and after all, I don't want to implement some kind of prolog just to
61 choose the right one. If you want to improve it, let me know.
65 The monochromatic translation is done by some bit of green
66 color, which can be changed at the beginning of vncproto.c. If you
67 want to make it better (implement some dithering or (better) the
68 shape finding algorithm), let me know.
72 The work was inspired by mine never-ending desire for an X
73 display on the "frog". Display drawings are based on the graphics
74 library by Marek Zelem, which is, in turn, based on the documentation
75 for vdt52s, as my work is based on vnc protocol documentation. Coded,
76 of course, on vdt52s terminal with wrong Enter and Control. The sources
77 are written to be easily extended.
81 Milan Pikula, <www@terminus.sk> or <www@fornax.sk>