CBTRLE Overlay routines for use with CBterm/C64 (all files (c) 1985 by Chrisdos) CBTRLE is an overlay subroutine program that links itself to CBterm to provide additional functions inside CBterm. CBTRLE provides a method of PRINTING the Hi-Resolution screen to a standard line printer. CBTRLE replaces the normal HI-Res screen dump (that will only work to a Star or Epson type dot-matrix printer) with a conversion routine that will translate to normal ASCII characters. In other words, the amount of shading on the screen is translated to a standard ASCII character that represents the amount of shading on the paper. Any printer can then print the characters. The normal Hi-Res screen (for CB Pictures and Weather maps) is 256 by 192. This is too large an area for any standard printer to handle, so it is scaled by a factor of 4 to provide an 80 by 48 grid. This fits printers very nicely. Due to the scaling, there is a reduction in resolution, but very respectable pictures are produced. USE OF CBTRLE. -------------- CBTRLE is a high memory overlay that loads into $C000. It is like the CBTVTX overlay, and therefor, they MAY NOT be used together. CBTRLE is only really needed when you wish to print pictures anyway, and as such does not have to be loaded all the time. To use CBTRLE, before loading CBterm, you enter: LOAD"CBTRLE",8,1 (You will note that this is a non-relocatable load) You then load CBterm normaly: LOAD"CBTERM" (Standard load) You then run CBterm, it will ask for the baud rate and show the opening screen. If CBTRLE has been found, the version number will show: V4R5 CBTRLE replaces the normal screen dump built into cbterm and is controled by the C=6 and C=\ (english pound) keys. You would log on as normal and goto the Hi-Res picture you want. (Note: If you have been using the CBTVTX overlay and have your terminal type on CIS set to VIDTEX, then you will see some wierd letters on your screen because your VIDTEX emulator is not running, therefor, you might want to log on and add ",TTY" to your id number. This will make CIS not send the Vidtex control codes for this session only. Exmaple: 76703,717,TTY Will make CIS think your terminal is a standard TTY.) When you have the pictuure you want on the screen, you press C= 6 (Commodore key & 6) to dump to the printer. Please make sure your printer is on line, or the program might hang. To inverse the image (white to black/black to white) Press the C= \ (english pound) keys and then dump the pictuure (c= 6) again. The CBTRLE routine will read the screen, crunch the data and send it to the printer as ASCII characters. GREY SCALE CONTROL ------------------ There are 17 possible values (4 x 4 hi-res pixels crunched into one value, making 0 thru 16) that can be produced. These are translated by a table lookup into 1 of 9 possible characters. (blank ' . / : % $ # *) This is the present table inside CBTRLE Value Character ----- ---------- 0 (space) Lightest Character 1 ' 2 ' 3 . 4 . 5 / 6 / 7 : 8 : 9 % 10 % 11 $ 12 $ 13 # 14 # 15 * 16 * Darkest Character You may wish to change this table to suit your own printer, or just to try different values for different results. The table is located at 49390 to 49406. After you load CBTRLE you can poke different values for ASCII characters into the table to change it. If there are any questions or comments on CBTRLE or CBterm/C64, please leave a message to SYSOP in the CBIG SIG. Thank you -Chrisdos CBIG SYSOP [76703,717]
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