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From: | gswan AT globalserve DOT net (George Swan) |
Newsgroups: | comp.os.msdos.programmer,comp.os.msdos.djgpp |
Subject: | Re: Interrupts reserved for BASIC |
Date: | 28 Sep 1999 13:22:01 -0400 |
Organization: | Globalserve Communications Inc. |
Message-ID: | <7sqtfp$5dt@globalserve.net> |
References: | <7slrv7$4nv$1 AT solomon DOT cs DOT rose-hulman DOT edu> <7sn3ai$ffq AT globalserve DOT net> |
NNTP-Posting-Host: | globalserve.net |
Lines: | 21 |
To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
After reading some of the other responses here I thought I would add that I have always assumed that, since DOS isn't multi-tasking, that any interrupt vector that contained a NULL pointer was available for my program to use. I use a function like this one to look for them. unsigned FindUnusedVector( /* Find an unused interrupt vector */ unsigned start ) /* start looking here */ { unsigned lastvector = TooHighVector; unsigned count; for (count = start ; count < lastvector ; ++count) { if (getvect( count ) == NULL) break; /* found an unused vector! */ } return count; }
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