Q37341: How to Create Your Own Font in Character Mode for EGA Text
Article: Q37341 Product(s): See article Version(s): 4.00 4.00b 4.50 Operating System(s): MS-DOS Keyword(s): ENDUSER | B_BasicCom | mspl13_basic Last Modified: 28-DEC-1989 The code example below shows a method of creating a user-defined text font for use with an EGA or VGA monitor. This method allows a person to define a specified number of new characters that are in order starting at a specified position in the table. Only those characters in the character set that are overwritten by the new fonts are changed. In the example below, the three new characters are printed and the fourth character from the original set is printed. This code example applies to QuickBASIC Versions 4.00, 4.00b, and 4.50, to Microsoft BASIC Compiler Versions 6.00 and 6.00b for MS-DOS, and to Microsoft BASIC PDS Version 7.00 for MS-DOS. Note: Microsoft BASIC PDS Version 7.00 comes with a library of routines that allow loading and displaying of bitmapped fonts. BASIC PDS 7.00 comes with several font files, and the font library routines can load and display any of the Microsoft Windows bitmapped fonts. The following is a code example: ' $INCLUDE: 'qb.bi' DIM RegS AS RegType, RegL AS RegTypeX DIM table(100) DATA 0,0,0,2,6,14,30,62,126,254,0,0,0,0 DATA 0,0,0,254,64,32,16,32,64,254,0,0,0,0 DATA 0,0,0,132,136,158,162,70,130,14,0,0,0,0 CLS DEF SEG = VARSEG(table(0)) FOR i = 1 TO 42 READ A% 'Place the NEW characters into POKE VARPTR(table(0)) + i, A% 'graphics table NEXT i DEF SEG RegL.AX = &H1100 ' function 11 subfunction 0 RegL.BX = &HE00 ' There are &HE points per character ' put font at table 0 RegL.CX = &H3 ' defined three characters RegL.DX = 0 ' first character is chr$ (0) RegL.DS = -1 ' use old data seg RegL.ES = VARSEG(table(0)) ' address of table RegL.BP = VARPTR(table(0)) ' that holds the fonts CALL interruptX(&H10, RegL, RegL) ' make the call PRINT CHR$(0) + CHR$(1) + CHR$(2) + CHR$(3)
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