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Loading Device Drivers Into High Memory |
The information in this document applies to:
WordPerfect® 5.1 for DOS
Problem
Solutions: Users with DOS 5.0 who load device drivers and memory resident programs into high memory and run DOS applications that use expanded memory under Windows 3.0 should add the DEVICE=EMM386.EXE command to the CONFIG.SYS file. To use this driver, the user must use HIMEM.SYS prior to loading the EMM386.SYS line since EMM386.SYS is a simulated expanded memory manager which allocates a portion of the HIMEM.SYS extended memory for use as expanded memory. These two products create fixed block memory heaps and are not flexible in terms of sharing the common memory heap between them, thereby preventing many errors regarding running out of memory. Using this driver will also disable WIN30 from creating Simulated Expanded Memory for DOS applications when running enhanced mode and lowers the amount of extended memory available when running with EMM386.SYS unless the user also runs the "NOEMM" option on the startup line, which is another issue. User's using the "NOEMM" option are usually trying to get maximum performance out of the system. Users who want to use the DOS50 LOADHI option should determine the exact amount of memory needed for the intended LOADHI TSR's (assuming that they are certain there is room to LOADHI to the extent desired above 640K and below 1M, not including HMA 64K above 1M) and then specify that amount +200K~ on the EMM386.SYS startup line. Using Quarterdeck overcomes the whole problem since XMS/EMS is interchangeable and it only allocates the memory required for the utility to be loaded high and no more than what is needed. Quarterdeck will also remove from the TSR loaded high any released memory after the utility goes TSR upon the utility's exit on INT 31h. |
Answer:
Details:
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