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From:	NoEmailAds AT execpc DOT com (Chris Giese)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: error 4 with write to serial port
Date:	Sat, 24 Jan 2004 03:14:59 GMT
Organization:	PROPULSION GROUP
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To:	djgpp AT delorie DOT com
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Andrew Cottrell <andspam at swiftdsl dot com dot au> wrote:

>>I have built a DOS program with DJGPP to access a serial port.
>>This program works fine under plain DOS (ic IBM PC/DOS 6.3).
>>However when I boot from a bootable diskette created with
>>WinXP and start the program it returns error 4 with a write()
>>to the serial port.

Does it return error 4 from write() or from open()?
I think DOS error 4 is "too many open files". Try increasing
the FILES=nnn value in CONFIG.SYS

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