STACKS=n,c                                                      [new DOS 3.2]

STACKS allows you to specify the number of interrupts that can be stacked for 
later processing. An interrupt causes the computer to stop whatever it was 
doing, save some information, and decide what to do about the interrupt that 
has just occurred. Then, it uses the information saved to return to what it 
was doing before the interrupt occurred. Multiple interrupts may need to be 
stacked in case an interrupt occurs while it is still deciding what to do 
about a previous interrupt. STACKS=0,0 will save some memory, but may cause 
nested interrupts to be lost.

n specifies the number of interrupts to stack, 8-64. Default is 9. Really 
    fast typists may need more, or running a communications program with 
    PRINT installed may cause the "Internal Stack Failure" message.

c specifies the number of characters saved for an interrupt, 32-512. Default 
    is 128. It should be a multiple of 32.
