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From: frisk@rhi.hi.is (Fridrik Skulason)
Newsgroups: comp.sys.ibm.pc
Subject: Re: detection of 43/50/... line modes
Message-ID: <1602@krafla.rhi.hi.is>
Date: 29 Mar 90 12:14:27 GMT
References: <58consult@physc1.byu.edu> <5534@jarthur.Claremont.EDU>
Reply-To: frisk@rhi.hi.is (Fridrik Skulason)
Organization: University of Iceland (RHI)
Lines: 15

In article <5534@jarthur.Claremont.EDU> jmerrill@jarthur.Claremont.EDU (Confusion Reigns) writes:
>In article <58consult@physc1.byu.edu> consult@physc1.byu.edu writes:
>>    Is there a standard way to detect the number of lines an EGA or VGA display
>>adapter is currently using? 

>Yes.  Check memory location 0040:0084; it contains the number of screen
>lines minus 1 (a 25-line display is 18 hex, a 50-line display is 31 hex).

Just make sure first that the program is really running on a machine with
EGA or VGA. On a computer with CGA or Hercules 40:84 is undefined.

-- 
Fridrik Skulason      University of Iceland  |       
Technical Editor of the Virus Bulletin (UK)  |  Reserved for future expansion
E-Mail: frisk@rhi.hi.is    Fax: 354-1-28801  |