markz@microsoft.UUCP (Mark Zbikowski) (06/12/85)
The problem with "SHELL=" clobbering BASIC's data segment is actually a bug in the EXEC code for DOS 2.0. The bug clobbered locations 0x2E-0x31 in the DS presented to the EXEC system call. This bug was fixed in DOS 2.1. Note that SHELL is completely documented in 3.*.