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| From | Ross Ridge <rridge@csclub.uwaterloo.ca> |
| Newsgroups | comp.os.msdos.programmer |
| Subject | Re: Odd problem with int 0x21, ah = 0x4A |
| Date | Sat, 30 Apr 2011 01:02:31 -0400 |
| Organization | University of Waterloo |
| Lines | 21 |
| Message-ID | <ipg557$283$1@rumours.uwaterloo.ca> (permalink) |
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| NNTP-Posting-Date | Sat, 30 Apr 2011 05:02:31 +0000 (UTC) |
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R.Wieser <address@not.available> wrote: >Shouldn't you round-up the "shr bx, 4" result (just add 0x000F before >shifting) ? Otherwise it might be 1 to 15 bytes too small ... > >Also, have you checked the value in BX just before the INT 0x21 call ? Does >it match your expectations ? > >My guess is that somehow your stack, and by it your program (and DS) gets >trashed. Yah, that looks like what's exactly happening here. Because of the rounding error you mentioned the program shrinks its memory so that end of the stack is no longer in allocated memory. Ross Ridge -- l/ // Ross Ridge -- The Great HTMU [oo][oo] rridge@csclub.uwaterloo.ca -()-/()/ http://www.csclub.uwaterloo.ca/~rridge/ db //
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Odd problem with int 0x21, ah = 0x4A Freedom on the Oceans <alex.buell@munted.org.uk> - 2011-04-28 15:18 +0100
Re: Odd problem with int 0x21, ah = 0x4A Jim Leonard <mobygamer@gmail.com> - 2011-04-28 10:58 -0700
Re: Odd problem with int 0x21, ah = 0x4A Freedom on the Oceans <alex.buell@munted.org.uk> - 2011-04-28 19:30 +0100
Re: Odd problem with int 0x21, ah = 0x4A "R.Wieser" <address@not.available> - 2011-04-28 22:57 +0200
Re: Odd problem with int 0x21, ah = 0x4A Ross Ridge <rridge@csclub.uwaterloo.ca> - 2011-04-30 01:02 -0400
Re: Odd problem with int 0x21, ah = 0x4A Freedom on the Oceans <alex.buell@munted.org.uk> - 2011-05-01 08:48 +0100
Re: Odd problem with int 0x21, ah = 0x4A "R.Wieser" <address@not.available> - 2011-05-01 13:43 +0200
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