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Article #1001Re: Smallest TSR (was Re: Why can't I hook INT 21h???)
From: Duncan Murdoch
Date: Thu, 27 Aug 1992 15:40
Date: Thu, 27 Aug 1992 15:40
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In article <BtMG1E.A6D@ireq.hydro.qc.ca> beaurega@ireq.hydro.qc.ca (Denis Beauregard) writes: > >But, from first example of a small TSR we got, the program was heavily >using inline or assembly code using particularities of C to make it >easier to program in assembly than direct assembly. However, this is >ASM, not HLL (high level language). In other words, it is curious >to need to use the lower level language to get the more (or the less >in space occupied) from a higher level language (or isn't it natural : >the more you know, the more you can do). Take a look at the entry I just posted. It's entirely in a high level language (Turbo Pascal), using a widely available commercial library (Object Professional). The only place I bent your rules was to make a direct DOS call in order to release the environment segment. It takes 160 bytes, just 32 bytes more than the original example of a tiny TSR posted by Ralf Brown, and performs the same function. If I'd been allowed to write the ISR part in inline assembler, I don't see any reason I couldn't have matched or beaten his record. The advantage of writing in TP (or another HLL) is that the loader part is particularly easy to write; all the stuff I did there is commonly available "off the shelf". For example, if I'd wanted to parse complicated command line arguments, it would have been easy. Duncan Murdoch dmurdoch@mast.queensu.ca
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Newsgroups: comp.os.msdos.programmer Path: arc1-ca.pugleaf.net!sparky!uunet!utcsri!torn!news.ccs.queensu.ca!mast.queensu.ca!dmurdoch From: dmurdoch@mast.queensu.ca (Duncan Murdoch) Subject: Re: Smallest TSR (was Re: Why can't I hook INT 21h???) Message-ID: <dmurdoch.74.714930041@mast.queensu.ca> Lines: 26 Sender: news@knot.ccs.queensu.ca (Netnews control) Organization: Queen's University References: <1992Aug21.175406.3881@alw.nih.gov> <BtCwo7.C1o.2@cs.cmu.edu> <19866@plains.NoDak.edu> <BtMG1E.A6D@ireq.hydro.qc.ca> Date: Thu, 27 Aug 1992 15:40:41 GMT