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Error "Divide Overflow" With DXMA0MOD.SYS In |
The information in this document applies to:
WordPerfect® 5.1 for DOS
Problem
Symptoms: The customer is loading the DXMA0MOD.SYS file into upper memory blocks. This causes the system to return a "Divide Overflow" error message when the customer is within WordPerfect. The customer is using QEMM 5.1 as the memory manager. When the customer takes the file (DXMA0MOD.SYS) out of the upper memory blocks, the error message does not appear. Solutions: The DXMA0MOD.SYS driver is a Terminate and Stay Resident (TSR) program. When the "Divide Overflow" error appears, 80% of the time the error message is the direct result of the CPU no longer running the TSR program (or logical code) after a hostile event occurs. This means that random code execution has been initiated into the system. Why would this happen? 1. When WordPerfect is initializing, it is allocating and releasing conventional memory and expanded memory (EMS) to look for problems. 2. DXMA0MOD.SYS is a memory manager. These two facts have everything to do with the problem that the user has encountered. DXMA0MOD.SYS can't handle being run in upper memory. The program is designed to run in multiple 64K segments. By running this driver in upper memory, the user runs the risk of executing ROM/RAM code unrelated to the TSR or WP program. This is exactly what was happening in the customer's system. Instead of being able to execute the TSR program from upper memory blocks, the system began executing random machine code and returned the "Divide Overflow" error message. |
Answer:
Details:
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