Date: Mon, 1 Jan 1996 20:25:35 +0000 (GMT)
From: "D. Hibbs" <mtx064 AT coventry DOT ac DOT uk>
To: djgpp maillist <djgpp AT delorie DOT com>
Subject: MSDOS function calls
Message-ID: <Pine.ULT.3.91.960101202348.15296B-100000@rowan>
MIME-Version: 1.0

I have found that when you use the int 21h calls to MSDOS the high half 
of the extended registers are cleared.  This seems to happen to eax, ebx, 
ecx, edx, esi and esi but not ebp or esp.

Dominic