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If you enable write protection then shadowed ROM spaces
can never be overwritten, this is safer, but results in lower
performance.
ISA bus
Bus speed
These two options, in conjunction with a switch on the
motherboard, allow the speed of the ISA bus to be varied.
When this option is set to Fast, and the switch on the
motherboard is set to 8MHz the bus is fully compatible with
the ISA specification.
If this option is set to Slow and the switch on the
motherboard is set to 8MHz the bus is slightly slower than
the ISA specification.
If this option is set to Slow and the switch on the
motherboard is set to 10MHz the bus is slightly faster than
the ISA specification.
If this option is set to Fast and the switch on the
motherboard is set to 10MHz the bus is significantly faster
than the ISA specification.
I/O decoding
These two option buttons allow you to choose whether 16
or 10 address bits are decoded for I/O cycles to the ISA
bus.
16 bit decoding allows access to the full 64K I/O space on
the ISA bus.
10 bit decoding is slightly quicker, but restricts I/O
accesses on the ISA bus to the bottom 1K, from 0h to
399h.
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