INSTRUCTIONS FOR CHRDEF.BA

Because the Model 100 character definitions are in ROM, it is not possible to 
truly redefine a character for the screen display as is done with many other 
computers.  While any configuration can be done with the PSET and PRESET 
commands, this is slow, and the subroutine looping varies according to the 
shape of the defined character.
CHRDEF.BA addresses the pixels directly by means of the LCD drivers, addressing
8 pixels at a time and the routine is unchanged no matter what the 
configuration of the character.  Visually, the routine is virtually as fast as 
the normal character print routines so is invisible to the program user.
To use CHRDEF.BA, first merge this routine into your program.  Define each 
character as a DATA line with six values.  The values are the decimal numbers 
whose binary forms would mirror the on/off pixels of one vertical column of the
character from bottom to top.  For example 128 (b=10000000) would have a single
pixel on the bottom with the rest off, while 255 (b=11111111) would have all 8 
pixels turned on. (Remember that each normal character is in a block 6 pixels 
wide and 8 high.)
To call CHRDEF.BA,RESTORE the DATA line for the character you want and 
immediately GOSUB 64000; the character will be printed to the screen like any 
normal character.  CHRDEF.BA uses the current cursor position and updates it, 
therefore it can be used in conjunction with regular PRINT statements.  (ex. 
PRINT A$;:RESTORE 510:GOSUB 64000:PRINT B$ will print all three items on one 
line.)  So as to allow other text to follow it, CHRDEF.BA does not 
automatically terminate a row (line); a final null PRINT will be needed if you 
wish to use it at the end of a line.
CHRDEF.BA specifically addresses LCD display, a graphics dump is necessary if 
you wish to echo these definitions to your printer.
If you have any comments, suggestions, etc. reach me at 74756,413--Jay Holovacs