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ISA I/O Address Map
6.2.1 Flash ROM Address Map
The address range for the flash ROM is FFF8.0000–FFFF.FFFF. Flash space of 1MB
is obtained by double mapping this 512KB space. FLASH_ADR19 register at I/O
location 800
provides this function. Writing a 0 to this location enables the lower
16
512KB of flash. Writing a 1 to this location enables the upper 512KB of flash.
Interrupts and ISA Bus Addresses
6–3
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