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mirror of synced 2026-01-12 00:02:46 +00:00
Matthieu Bucchianeri 0fbbc0070c
Add support for DOS Upper Memory Blocks (UMBs). (#38)
* Import unmodified USE!UMBS source.

From https://forum.vcfed.org/index.php?threads/loading-dos-high-on-a-xt.32320/

* Customize the UMB Driver prompts.

* Refactor memory management. Allow activation of EMS/UMB on demand.

* Update the XTEMM and XTUMBS drivers to map their ranges.

* Add instructions for all the drivers.
2025-03-07 22:00:26 -08:00
..

*************************************************************************
*							        	*
*	EMS 4.0 Driver for XTMax, rev.02, Jan-2025	*
*							        	*
*	Based on Lo-Tech driver	*
*									*
*	http://www.lo-tech.co.uk/wiki/2MB-EMS-Board			*
*	http://www.lo-tech.co.uk/wiki/LTEMM.EXE				*
*									*
*	This code is TASM source.					*
*									*
*	Based on original works Copyright (c) 1988, Alex Tsourikov.	*
*	All rights reserved.						*
*									*
*	Original source kindly provided subject to the BSD 3-Clause	*
*	License: http://opensource.org/licenses/BSD-3-Clause		*
*									*
*	This software, as modified, is provided subject to the terms 	*
*	of use at: 							*
*									*
*	http://www.lo-tech.co.uk/wiki/lo-tech.co.uk:General_disclaimer	*
*									*
*	No charge has been made for this software.			*
*									*
*************************************************************************

Syntax:    DEVICE=LTEMM.EXE [/switches]
 /p:nnnn - Page frame address (D000)
 /i:nnn  - EMS i/o port base address (260)
 /h:nnn  - Maximal number of handles (64)
 /d:nn   - Depth of contest saves (5)
 /n      - Bypass memory test
 /x      - Perform long memory test
 /3      - Use only EMS 3.2 functions
 /q      - Quiet mode

Defaults in parentheses. This driver has been tested under MS-DOS 6.22.