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- 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
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- 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.
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- 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.
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- 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.
-