Q35148: Underline, Reverse, Intense, Blinking in Monochrome SCREEN 0
Article: Q35148 Product(s): See article Version(s): 4.00 4.00b 4.50 Operating System(s): MS-DOS Keyword(s): ENDUSER | B_BasicCom B_GWBasicI | mspl13_basic Last Modified: 16-DEC-1989 On the Hercules Graphics Adapter (HGA) or the IBM Monochrome Display Adapter (MDA), the foreground and background arguments of the COLOR statement support underlined, reverse-video (highlighted), blinking, or high-intensity characters. Reverse/underline and intense/reverse combinations are not supported by HGA or MDA. The following 11 combinations of COLOR statement foreground and background values are available on monochrome, SCREEN 0 (text) displays: FORMAT COLOR Statement ATTRIBUTE White on black (normal) COLOR 7,0 7 Black on black (no display) COLOR 0,0 0 Black on white (reverse) COLOR 0,7 112 Underline COLOR 1,0 1 Intense COLOR 10,0 10 Blinking COLOR 18,0 130 Reverse blinking COLOR 16,7 240 Intense underline COLOR 9,0 9 Intense blinking COLOR 26,0 138 Underline blinking COLOR 17,0 129 Intense blinking underline COLOR 25,0 137 This information applies to the following products: 1. Microsoft QuickBASIC Compiler Versions 4.00, 4.00b, 4.50 2. Microsoft BASIC Compiler Versions 6.00 and 6.00b for MS-DOS and MS OS/2 3. Microsoft BASIC PDS Version 7.00 for MS-DOS and MS OS/2 4. Microsoft GW-BASIC Interpreter Versions 3.20, 3.22, and later In SCREEN 0 with a color card (CGA, EGA, or VGA), the COLOR statement is used to change the foreground and background colors that are displayed. The COLOR statement also lets you select intense or blinking options for the foreground color. Underlining is not supported on color monitors. In text mode (SCREEN 0), two consecutive bytes are used to store each character in screen memory. One byte contains the ASCII value of a character, and the following byte contains ATTRIBUTE information for that character. Attributes can be calculated with the following formula: ATTRIBUTE = 128*(FOREGROUND\16)+BACKGROUND*16+(FOREGROUND MOD 16) [Note: The backslash character (\) is the integer division operator.] See Pages 79-81 of "The Peter Norton Programmer's Guide to the IBM PC" (published by Microsoft Press, 1985) for more information about attributes. The following book from Microsoft Press describes video details more completely: "Programmer's Guide to PC & PS/2 Video Systems," by Richard Wilton (1987). Chapter 3 describes the alphanumeric video modes. The following is a code example: 'This program will display all of the character formats resulting from 'each of the 32 foreground colors available for any of the 8 'recognized background colors with a monochrome card in SCREEN 0 (text 'mode). DEFINT A-Z 5 CLS LOCATE 20, 15 COLOR 7, 0 liner = 0 INPUT "background="; back FOR fore = 0 TO 31 IF liner = 16 THEN liner = 0 END IF liner = liner + 1 LOCATE liner, 1 + (20 * (fore \ 16)) PRINT fore; back; COLOR fore, back PRINT "A" COLOR 7, 0 NEXT fore WHILE INKEY$ = "": WEND GOTO 5
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