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- Document 1303
- Third Party Memory Managers
-
- Initials:
- MDC
- 11/2/91
- DRDOS 6.0
-
- Keywords:
- EMM386.SYS
- HIDOS.SYS
- QUALITAS
- QUARTERDECK
- DESQVIEW
- 386MAX
- QEMM
- QRAM
-
- Description:
-
- Relocating the Kernel
-
- When you use a memory manager from another vendor, you can gain additional
- conventional memory space by relocating the DR DOS kernel to upper
- or high memory. The third-party memory manager must support the XMS
- specification, and upper or high memory must be available.
- To relocate the kernel, insert the statement:
-
- DEVICE=C:\DRDOS\HIDOS.SYS
-
- after the statement that loads the third-party memory manager.
-
- HIDOS.SYS attempts, by default, to relocate the DR DOS kernel to upper
- memory. If upper memory is not supported or not available, the kernel
- is placed in high memory. You can force the kernel to high memory
- by using the following DEVICE statement:
-
- DEVICE=C:\DRDOS\HIDOS.SYS /BDOS=FFFF
-
- The following examples show how and where to add the statement when
- loading Qualitas 386MAX or the Quarterdeck QEMM or QRAM
- drivers.
-
- Qualitas 386MAX
-
- DEVICE=C:\386MAX\386MAX.SYS [...etc.]
- DEVICE=C:\DRDOS\HIDOS.SYS [...etc.]
- DEVICE=C:\386MAX\386LOAD.SYS [...etc.]
-
- Quarterdeck QEMM.386
-
- DEVICE=C:\QEMM\QEMM.SYS [...etc.]
- DEVICE=C:\DRDOS\HIDOS.SYS [...etc.]
- DEVICE=C:\QEMM\LOADHI.SYS [...etc.]
-
- Quarterdeck QRAM (with Intel AboveBoard)
- @SCREEN = DEVICE=C:\ABOARD\EMS.SYS AT 208 MC
- DEVICE=C:\QRAM\QRAM.SYS.
- DEVICE=C:\DRDOS\HIDOS.SYS
- DEVICE=C:\QRAM\LOADHI.SYS [...etc.]
-
- Note:
- EMM386.SYS cannot be used with other memory managers.
-
- When a third-party memory manager is loaded, the following config.sys
- statements have no effect:
-
- HIINSTALL
- HIDEVICE
- HIDOS= [ON/OFF] will work with third party memory managers that provide
- XMS UMB support. However, HILOAD, HIDEVICE, and HIINSTALL commands
- have no effect. Most memory managers offer equivalent commands that
- you can use.
-
- Quarterdeck DESQview
-
- When running the Quarterdeck DESQview proggram under the DR DOS 6.0
- operating system, use the QEMM386.SYS driver as the primary memory
- management driver instead of EMM386.SYS provided with the DR DOS 6.0
- operating system. When QEMM386.SYS loads from the config.sys file,
- it then becomes responsible for controlling both the upper memory
- area, between 640 Kytes and l Mbyte, and the high memory area, the
- first 64 Kytes above l Mbyte.
-
- Move device drivers and memory resident software to upper memory using
- the normal QEMM LOADHI commands. After loading QEMM386.SYS, the operating
- system kernel can still be moved to upper memory or high memory by
- loading the DR DOS HIDOS.SYS driver in the config.sys file right
- after the QEMM386.SYS driver. To move the kernel to upper memory,
- use the option /B=AUTO at the end of the HIDOS.SYS line in config.sys.
-
- To specify that the kernel should be placed in high memory, leaving
- more upper memory available for device drivers and memory resident
- programs, use the option /B=FFFF.
-
- Depending on the configuration of DESQview, a gain in available memory
- might not be seen after loading HIDOS.SYS. DESQview uses the high
- memory for 63Kbytes of code that normally sit in conventional memory,
- while HIDOS.SYS moves approximately 45Kbytes into that area. Because
- the high memory area can be used by only one application at a time,
- experiment with /B=AUTO, /B=FFFF, or do not load HIDOS.SYS.
- These different options can be quickly tested using the DR DOS 6.0
- question mark option (?) in config.sys. Placing a ? in front of
- any line in config.sys displays that line at boot-up and then you
- can select Y(es) or N(o) to execute that instruction.
-
- You might insert the following lines while experimenting:
-
- ?"Do you want to avoid moving the KERNEL (Y/N)"GOTO SKIP
- ?"Kernel in Upper Memory (Y/N)"
- DEVICE=C:\DRDOS\HIDOS.SYS /B=AUTO
- ?"Kernel in High Memory (Y/N)"
- DEVICE=C:\DRDOS\HIDOS.SYS /B=FFFF
- :SKIP
-
- Refer to Chapter 11 of the DR DOS 6.0 User Guide for a full
- discussion of this feature.
-
- If you are running QEMM386.SYS without DESQview, you should always
- move the kernel to high memory.
-
- HIDOS=ON AND 3RD PARTY MEMORY MANAGERS
-
- It was brought to our attention recently that the HIDOS=[ON|OFF] command
- from DR DOS 6.0 will function properly with QEMM v.6.0. I have found
- that HIDOS=[ON|OFF] will work with any XMS UMB provider. That is, if a
- user loads a third party memory manager which creates and makes
- available XMS upper memory blocks compatible with the 2.0 specification,
- HIDOS=[ON|OFF] itself will relocate DR DOS 6.0 data structures in upper
- memory. Those blocks will appear as "XMS UMB"'s from within any memory
- mapping utilities provided with the third party memory manager.
-
-