Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!dalcs!iisat!dalcsug!dalegass From: dalegass@dalcsug.UUCP (Dale Gass) Newsgroups: comp.sys.ibm.pc Subject: Re: How does one enable the other 8 background colors Message-ID: <108@dalcsug.UUCP> Date: Sun, 5-Jul-87 12:07:55 EDT Article-I.D.: dalcsug.108 Posted: Sun Jul 5 12:07:55 1987 Date-Received: Sun, 5-Jul-87 22:35:53 EDT References: <292@qtc.UUCP> <1005@watmum.UUCP> <1982@druhi.ATT.COM> Organization: Dalhousie University, Halifax, N.S., Canada Lines: 34 Summary: How to enable the intensified colors In article <1982@druhi.ATT.COM>, bryan@druhi.ATT.COM (BryanJT) writes: > > This isn't quite true. Bit 5 of the "Mode Select Register" of the 6845 > CRT controller (used in the IBM CGA and many clones) selects blinking > versus 16 background colors. Doing: > > MOV DX,03D8H > OUT DX,009H > > on an IBM PC with CGA will cause 80x25 color text mode to be selected > with 16 background colors and no blinking. In this mode, setting what is > normally the "blink" bit will now intensify the background color, giving > you access to the other 8 background colors. The ROM BIOS merely sets Although the following doesn't work on my cga-clone, the IBM manuals say that bit 4 of register 3d9 will 'Intensify the background colors in the alpha mode'. Thus, an MOV DX,03d9h MOV AL,10 OUT DX,AL should allow the use of the other 8 background colors (but not all 16 at once). -dalegass@dalcsug.uucp gotta include more new text than old text... gotta include more new text than old text...