IBM JAGUAR V 386 System Manual page 18

GENERAL FEATURES
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In OCTEK JAGUAR V-386DX, a hidden refresh
function is provided. When the hidden refresh function is
enabled, the CPU will not stop its operation and the
memory refresh operation is transparent to the CPU
access. The chipset will monitor the whole system. If
the CPU is accessing the main memory, the memory
refresh operation is postponed and will be carried out
when there is no access to main memory. Special
refresh mechanism is implemented to reduce the period
of memory refresh operation.