Take Over ROM/EPROM/FLASH
The NTKO pin in the card port is normally left floating. A ROM, EPROM, or FLASH card may
be manufactured as a take-over device if the NTKO pin is connected to ground. This pin
is sampled each time the system is turned on. If the pin is low, it will cause a swap in
functionality between the NRCE and NCS[0] pads. This makes the plug-in card look like
the system ROM and the system ROM look like plug-in port 0.
The following rules apply to write protection:
- The write protect switch on the plug-in card always write protects the card
(NCS[1:0]).
- The write protect bit at index -86h is associated with NRCE in normal operation. In
take-over mode this bit is associated with NCS[0].
- NRCE cannot be hardware write-protected in take-over mode.