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From: funkstr@ucscb.UCSC.EDU (-=/ Larry Hastings /=-)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Cursor question, Int 0x10 service 0x03
Keywords: insert cursor, problem, certain machines
Message-ID: <5540@saturn.ucsc.edu>
Date: 20 Nov 88 13:46:34 GMT
References: <9821@watdragon.waterloo.edu>
Sender: usenet@saturn.ucsc.edu
Reply-To: funkstr@ucscb.UCSC.EDU (-=/ Larry Hastings /=-)
Distribution: comp
Organization: MetaWare, Incorporated
Lines: 40

+-In article <9821@watdragon.waterloo.edu>, bamcpherson@trillium.waterloo.edu (Brent McPherson) wrote:-
+----------
|
| 
| Hi, 
| 	I calculate a half-height insert cursor from the information
| 	received through interrupt 0x10, service 0x03. 
| 	What I do is take the old cursors bottom scan line, divide this
| 	by two. This now becomes the new top scan line of the insert cursor.
| 
| 	eg.
| 	regs.h.ah = 0x03;                /* read cursor position */
| 	intr( 0x10, &regs );             /* perform video interrupt */
| 	old_cursor = regs.x.cx;          /* save normal cursor */
| 	ins_cursor = (((old_cursor & 0xff) >> 1) << 8) + (old_cursor & 0xff);
| 
| 	There seems to a problem on certain machines. (the plain IBM PC
| 	with a monochrome monitor I think) Basically instead of getting a
| 	half-height insert cursor you get a cursor in the middle of the
| 	character.
| Brent
|
+----------

  Aha!  This is because on MGA, the cursor is (if memory serves) 11 lines tall,
not 8.  It might be 13, but I think it's 11.  Anyways, you're setting the bottom
to be 8, and the bottom line is 11, so the cursor stops two-thirds of the way
from the bottom...  anyways, the fix is obvious; you just need to take in
account the taller cursor for MGA.


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