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- I upgraded my Dos to 3.3 (Zenith)
- and started having intermittent lockups. One of the Model 55SX machines down
- the hall was running Dos 4.00 and wouldn't run at all with the driver loaded.
- I've tracked it down to a stack overflow. The default setting for STACKS is
- 9,128 in Dos 3.3 and Dos 4.00. When the system is servicing a hardware IRQ,
- the stack is only 128 bytes. Add a Token receive IRQ, and bang, the system
- hangs. You can fix the problem by setting STACKS=9,512 (the 512 is the
- important number here).
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