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- VMS40
- =====
-
- This is a device driver that makes either a hard disk or a floppy disk
- into LIM4 expanded memory. It is a software emulation of the 28
- function standard set forth in the Lotus/Intel/Microsoft Expanded
- Memory Standard (LIM/EMS) version 4.0. All of the EMS 4.0 functions
- that can be implemented through software are provided by VMS40, with
- the exception of the DMA functions included in the Alternate Map
- Register Set function (function 28).
-
- The program is backwards compatible with software written for the
- earlier LIM 3.2 standard (courtesy of Lotus, Intel & Microsoft). It
- lets you specify which drive to use for expanded memory, and how much
- disk to reserve.
-
- The trial version VMS40.240 restricts you to reserving no more than
- 240K for LIM memory, while the registered version VMS40.SYS allows you
- to reserve up to 32M
-
- You install VMS40 as you would any other DOS device driver through you
- CONFIG.SYS file. When you include the driver in you file, be sure to
- include the drive and path information so that DOS can find the file
- at boot time. The full syntax is
-
- DEVICE=[d:\][path\]VMS40.SYS [d:] [nnn] [/Fm]
-
- where [d:\][path\] specifies the drive and path in which the driver
- lives.
-
- The optional [d:] specifies which drive to place the Virtual LIM
- memory on. If omitted, it defaults to C: if you boot from a hard disk,
- and A: if you boot from a floppy.
-
- The optional [nnn] specifies the amount of memory you wish to reserve,
- in Ks (Kilobytes). If omitted, the trial version uses a default (and
- maximum) value of 240K, while the registered version uses a default
- value of 360K.
-
- If you have high memory available, you can set the page frame to a
- high memory address by using the /F parameter:
-
- /F1 = C000 - CFFF
- /F2 = C800 - D7FF
- /F3 = D000 - DFFF
- /F4 = D800 - E7FF
- /F5 = E000 - EFFF
- /F6 = E800 - F7FF
- /F7 = A000 - AFFF
-
- If you use this parameter, it must be LAST. Please run the program EMS
- to test that everything works on your machine. IF YOU DO NOT HAVE HIGH
- MEMORY, but you try to locate the page buffer there, you will not get
- an error, BUT the data stored to LIM memory will be trashed!
-
-
- Example
- =======
-
- DEVICE=C:\UTILS\VMS40.SYS 6000
-
- which uses the registered version residing in directory UTILS on drive
- C: to reserve 6000K (= 6M) on drive C: for expanded memory.
-
- As with all device drivers, once installed, it can only be removed by
- rebooting.
-
- The VMS40 driver logically maps disk-memory pages of 16k blocks
- into four contiguous physical pages of conventional RAM. Including the
- 64K physical page map area, the installed size of the driver is
- approximately 69K. VMS40 cannot map the pages into any other area than
- the 64K window it allocates automatically on boot up.
-
- The program allocates a disk file called $VMS40@@.VM$ in the root
- directory. Its attributes are System and Hidden. It is allocated at
- the appropriate size to hold the LIM memory pages. Don't try deleting
- it if you have the driver running!!! If you allocate the file on
- floppy, don't remove the floppy while the driver is running!!!
-
- Naturally, using disk to simulate LIM memory is somewhat slower than
- having the appropriate hardware implementation, but it is also a lot
- cheaper! If you need to run big spreadsheets, or use Borland's
- standalone debugger to debug a really large program, and you cannot
- afford 2Meg of LIM memory, then VMS40 is your answer.
-
- LMS40
- =====
-
- This is for use on AT computers wih extended memory above the 1 Meg
- barrier. This driver converts extended memory into LIM memory, in a
- similar fashion to VMS40.
-
- Example
- =======
-
- DEVICE=C:\UTILS\LMS40.SYS 1400 /F5
-
- which converts 1.4M of extended memory into LIM 4 expanded memory,
- with a page frame at E000
-
-
- HI MEMORY LOADS
- ===============
-
- If you have a machine that has free memory above 640K and below 1M,
- AND you have a suitable loader such as Quarterdecks QEMM, you can free
- up the 69k below and load the entire device driver into Hi Memory.
- Consult your software manual for details on how to load device drivers
- into Hi Memory. In this situation, DO NOT use the /F parameter, but
- let the page frame default to follow after the driver. (otherwise you
- may confuse the hi load program)
-
-
- FILES ON THIS DISK
- ==================
-
-
- VMS40.SYS disk LIM device driver
- VMS40.DOC this document
- LMS40.SYS extended Memory LIM emulator
- VMS40.TXT specification of LIM 4 function calls
-
- EMS.PAS public domain program that tests LIM memory
- EMS.EXE compiled version of above
-
-
- If you have any constructive comments, or would like to know more
- about our products, please contact us.
-
-
- KNOWN PROBLEMS
- ==============
-
- VMS40 - Desqview appears to trash the page frame. When this is
- fixed, you will all receive a replacement version.
-
- LMS40 - NONE - this works with 4Dos & Desqview
-