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Dayworker
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MS-DOS was a single core OS and does not knows something about multiple cpu's or cores. If you start MS-DOS, it will use the cpu and this means ever with all available cores. You can fix this via task-manager and change the affinity for the process "vmware-vmx.exe" to one core. Or you set the affinity inside your VMX:

processor0.use = "FALSE"

processor1.use = "TRUE"

processor2.use = "FALSE"

processor3.use = "FALSE"

With this setting inside a virtual machine config (VMX), the VM will run only on the second core. You can verify this via task-manager.

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