🚀 go-pugleaf

In article <1992Aug11.142038.200@mble.philips.be>, stern@mble.philips.be writes:
> Does anybody know how is implemented the CLS command ?
> I mean the interrupt(s) used to completely reset the screen.
> 
> Thanks a lot,
> 
> --  Marc Stern  <stern@mble.philips.be>

I',m getting a little rusty (I just can't seem to remember all of
the interrupt calls, with the appropriate register assignments)

Get number of columns on the display
Get number of rows on the display
Set scroll window to (0, 0) and (columns-1, rows-1)
Set display attribute to grey on black (as if everyone still
	has a Monochrome Display Adapter)
Scroll (either up or down, it makes no difference)the entire window

Pretty simple.  For my CLS routine, instead of using the brain-dead
method of grey on black for the text attributes, I first get the
character *AND ATTRIBUTE* at the current cursor location, which I
then use as the display attribute.

Sorry that I can't supply more information regarding graphics modes,
but I have not done any graphics programming for a VERY long time.

-- 
Mike "Okie" Gillmore
no .sig, no glory

In article <1992Aug11.223726.9385@caeco.mentorg.com> mike_gillmore@mentorg.com writes:
>In article <1992Aug11.142038.200@mble.philips.be>, stern@mble.philips.be writes:
>> Does anybody know how is implemented the CLS command ?
>> I mean the interrupt(s) used to completely reset the screen.

>Get number of columns on the display
>Get number of rows on the display
>Set scroll window to (0, 0) and (columns-1, rows-1)
>Set display attribute to grey on black (as if everyone still
>	has a Monochrome Display Adapter)
etc.

I don't think it is anywhere near this complicated.  I just get the current
mode, via INT 10, fn 0F, then set the current mode, via INT 10, fn 0.

It's been a while, so don't quote me - you may have to do something with BX
as well.  But, as they say, it's in all the better books.

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