Article View: comp.sys.ibm.pc
Article #25654Int 28H not issued from keyboard loops invoked by int 21h, 3fh
From: Gopal
Date: Thu, 17 Mar 1988 21:26
Date: Thu, 17 Mar 1988 21:26
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942 bytes
Normally an INT 28H is issued from keyboard wait loops when it is safe to do file i/o using INT 21H calls. However, no such interrupt seems to be issued if the keyboard is accessed through the INT 21H, fn. 3FH with the file handle of 0 (std in). Even PRINT.COM suspends operations during this call. Anyone know of any way safe way to do file i/o (from a TSR) during this call using DOS ? Considering that fn. 3fH is itself a file i/o call, is this an impossibility ? Thanks in advance for all responses. Venu P Gopal ihnp4!ihuxy!vg55611
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Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!lll-winken!lll-tis!ames!pacbell!att-ih!ihnp4!ihuxy!vg55611 From: vg55611@ihuxy.ATT.COM (Gopal) Newsgroups: comp.sys.ibm.pc Subject: Int 28H not issued from keyboard loops invoked by int 21h, 3fh Message-ID: <2451@ihuxy.ATT.COM> Date: 17 Mar 88 21:26:13 GMT Organization: AT&T Bell Laboratories - Naperville, Illinois Lines: 14 Keywords: REENTRANCY