Category: no classification
INT 2F - DR-DOS NLSFUNC 4.01+ - ENHANCED INSTALLATION CHECK
AX = 1400h
BX = 0EDCh
Return: AL = status
00h not installed, OK to install
01h not installed, not OK to install
(for example under a multitasker)
ES:DI -> version signature ("4.01$".."4.04$" for 4.01..4.04)
flags may be destroyed
Program: NLSFUNC 4.01+ is currently an independent project under
development by Matthias Paul. It is not yet publically available,
but as NLSFUNC 4.00 did, it will probably become available with
future DR-DOS releases.
Notes: If BX <> 0EDCh on entry, DR-DOS NLSFUNC 4.01+ performs the standard
installation check (INT 2F/AX=1400h), and does not change ES:DI.
DR DOS 5.0+ NLSFUNC 3.00+ returns CF set and AX=0001h, if AL was not
00h, FEh, or FFh on entry.
NLSFUNC 4.01+ will use the ES:DI enhancement to check the driver
version and calculate displacements into the resident driver for
runtime updates of internal structures like the local NLS database
If the returned ES points into the HMA (ES=FFFEh) care should be taken
to actually access the HMA while checking the version signature and
updating resident data (mutex with local A20 enable/disable).
While previous issues of NLSFUNC installed under a multitasker,
DR-DOS NLSFUNC 4.01+ will actually adapt to work properly in this
SeeAlso: AX=1400h"NLSFUNC.COM",AX=14FEh,AX=14FFh,INT 21/AH=65h