Category : Utilities for DOS and Windows Machines
Archive   : PORTFIND.ZIP
Filename : MUMB.DOC

Product: MUMB mcTRONic Systems
Date: May 5, 1991 7426 Cornwall Bridge Ln.
Document: Product Information Houston, TX 77041-1709
Version: MUMB.COM R1.00 (713) 462-7687
CIS#: 74365,1716 Hours: 5-10 PM M-F CST


MUMB is designed to read and display DOS 5.0 and higher UMB's
memory segments. UMB stands for Upper Memory Blocks. UMB's only
exist between the memory areas of 640K and 1Meg (Segments A000-
FFFF). This is above the normal memory area but below extended
memory. The Expanded memory page frame can coexist in the same
area as UMB's.

DOS 5 uses UMB's to load Device drivers and TSR's (Terminate and
Stay Resident programs). DOS 5 itself appears to load in the HMA
area, or the first 64K of Extended memory. UMB's under DOS 5 can
only be created on a 386 machine that has first loaded HIMEM.SYS
and then EMM386.SYS using the RAM option. Second, you must put
the command DOS=UMB also in the CONFIG file. I have also discov-
ered that you can load Quarterdecks QEMM386 under DOS 5 instead
of HIMEM.SYS and EMM386.SYS. Then still enter the DOS CONFIG
command DOS=UMB.

If you use QEMM to both create and manage your high memory, then
UMB will not work. Of course, just use LOADHI for that purpose.
However if you do wish to load QEMM under DOS 5, please consider
turning over that memory to DOS with the DOS=UMB command. MUMB
will then work and you could have the best of both worlds, that
is DOS 5 and QEMM.

MUMB does not require any run time parameters to operate. If you
are not using DOS 5 or do not have any UMB's present then MUMB
will terminate with an error message.

When MUMB runs it will display all UMB memory Segment ranges
present in hex. It will display the segment size in bytes and
the amount of free ram in that segment. Only the free ram area
at the end of the segment will be displayed. Any free memory
blocks that are trapped between used memory blocks will not be
added to the free total. In the event that you have more than
one UMB memory segment, MUMB will add one line to the display
that will totalize all size and free areas into two final totals.

MUMB is a shareware product and is included in the Port Finder
package. As such it shall not be broken from the set but provid-
ed as one package. MUMB is Copyright (c) 1991 by mcTRONic Sys-
tems in Houston, Texas. Any comments you have about UMB would be
welcome.